Patent Publication Number: US-2022223803-A1

Title: Organic metal compound, organic light emitting diode and organic light emitting device having the compound

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 10-2020-0180820, filed in the Republic of Korea on Dec. 22, 2020, which is expressly incorporated hereby in its entirety into the present application. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an organic metal compound, and more specifically, to an organic metal compound having excellent luminous efficiency and luminous lifespan, an organic light emitting diode and an organic light emitting device including the organic metal compound. 
     Discussion of the Related Art 
     An organic light emitting diode (OLED) among a flat display device used widely has come into the spotlight as a display device replacing rapidly a liquid crystal display device (LCD). The OLED can be formed as a thin organic film less than 2000 Å and can implement unidirectional or bidirectional images by electrode configurations. Also, the OLED can be formed even on a flexible transparent substrate such as a plastic substrate so that a flexible or a foldable display device can be realized with ease using the OLED. In addition, the OLED can be driven at a lower voltage and the OLED has excellent high color purity compared to the LCD. 
     Since fluorescent material uses only singlet exciton energy in the luminous process, the related art fluorescent material shows low luminous efficiency. On the contrary, phosphorescent material can show high luminous efficiency since it uses triplet exciton energy as well as singlet exciton energy in the luminous process. However, metal complex, representative phosphorescent material, has short luminous lifespan for commercial use. Therefore, there remains a need to develop a new compound that can enhance luminous efficiency and luminous lifespan. 
     SUMMARY 
     Accordingly, embodiments of the present disclosure are directed to an organic light emitting device that substantially obviates one or more of the problems due to the limitations and disadvantages of the related art. 
     An aspect of the present disclosure is to provide an organic metal compound having excellent luminous efficiency and luminous lifespan, an organic light emitting diode and an organic light emitting device including the compound. 
     Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the inventive concepts provided herein. Other features and aspects of the inventive concept can be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims hereof as well as the appended drawings. 
     To achieve these and other aspects of the inventive concepts, as embodied and broadly described herein, in one aspect, an organic metal compound having the following structure of Formula 1 is disclosed: 
     
       
         
         
             
             
         
       
         
         
           
             wherein M is molybdenum (Mo), tungsten (W), rhenium (Re), ruthenium (Ru), osmium (Os), rhodium (Rh), iridium (Ir), palladium (Pd), platinum (Pt) or silver (Ag); each of A, B and C is independently a 5-membered or 6-membered aromatic ring or a 5-membered or 6-membered hetero aromatic ring; each of X 1  and X 2  is independently CR 4 , N or P, one of X 1  and X 2  is CR 4  and the other of X 1  and X 2  is N or P; each of Y 1  and Y 2  is independently selected from the group consisting of BR 5 , CR 5 R 6 , C═O, C═NR 5 , SiR 5 R 6 , NR 5 , PR 5 , AsR 5 , SbR 5 , BiR 5 , P(O)R 5 , P(S)R 5 , P(Se)R 5 , As(O)R 5 , As(S)R 5 , As(Se)R 5 , Sb(O)R 5 , Sb(S)R 5 , Sb(Se)R 5 , Bi(O)R 5 , Bi(S)R 5 , Bi(Se)R 5 , O, S, Se, Te, SO, SO 2 , SeO, SeO 2 , TeO and TeO 2 ; each of R 1  to R 6  is independently selected from the group consisting of protium, deuterium, halogen, a hydroxyl group, a cyano group, a nitro group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic group, a silyl group, a C 1 -C 20  alkyl silyl group, a C 1 -C 20  alkyl group, a C 1 -C 20  hetero alkyl group, a C 2 -C 20  alkenyl group, a C 2 -C 20  hetero alkenyl group, a C 2 -C 20  alkynyl group, a C 2 -C 20  hetero alkynyl group, a C 1 -C 20  alkoxy group, a C 1 -C 20  alkyl amino group, a C 3 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 30  aromatic group and a C 3 -C 30  hetero aromatic group, or each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  independently forms a C 4 -C 20  alicyclic ring, a C 3 -C 20  hetero alicyclic ring, a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring when each of a, b and c is 2 or more; each of the alkyl group, the hetero alkyl group, the alkenyl group, the hetero alkenyl group, the alkoxy group, the alkyl amino group, the alkyl silyl group, the alicyclic group, the hetero alicyclic group, the aromatic group and the hetero aromatic group of R 1  to R 6  is independently unsubstituted or substituted with at least one of deuterium, halogen, C 1 -C 20  alkyl, a C 4 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 20  aromatic group, a C 3 -C 20  hetero aromatic group; each of the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring formed by each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of a, b and c is a number of substitutent R 1 , R 2  and R 3 , respectively, a is an integer of 0 to 3, b is an integer of 0 to 2 and c is an integer of 0 to 4; 
           
         
       
    
     
       
         
         
             
             
         
       
     
     is an acetylacetonate-based auxiliary ligand; m is an integer of 1 to 3, n is an integer of 0 to 2, wherein m plus n is an oxidation number of M. 
     In another aspect, an organic light emitting diode comprises a first electrode; a second electrode facing the first electrode; and an emissive layer disposed between the first and second electrodes and including at least one emitting material layer, wherein the at least one emitting material layer includes the organic metal compound. 
     As an example, the organic metal compound may be comprised as dopant in the at least one emitting material layer. 
     The emissive layer may have single emitting part or multiple emitting parts to form a tandem structure. 
     In still another aspect, an organic light emitting device, for example, an organic light emitting display device or an organic light emitting illumination device, comprises a substrate and the organic light emitting diode over the substrate. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain principles of the disclosure. 
         FIG. 1  is a schematic circuit diagram illustrating an organic light emitting display device in accordance with the present disclosure. 
         FIG. 2  is a cross-sectional view illustrating an organic light emitting display device as an example of an organic light emitting device in accordance with an exemplary aspect of the present disclosure. 
         FIG. 3  is a cross-sectional view illustrating an organic light emitting diode having single emitting part in accordance with an exemplary aspect of the present disclosure. 
         FIG. 4  is a cross-sectional view illustrating an organic light emitting display device in accordance with another exemplary aspect of the present disclosure. 
         FIG. 5  is a cross-sectional view illustrating an organic light emitting diode having a double-stack structure in accordance with still another exemplary aspect of the present disclosure. 
         FIG. 6  is a cross-sectional view illustrating an organic light emitting diode having a triple-stack structure in accordance with still further another exemplary aspect of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. 
     [Organic Metal Compound] 
     When excitons are activated in general phosphorescent materials, they show wide photoluminescence spectrum, low color purity and quantum efficiency. An organic metal compound in accordance with the present disclosure has a rigid chemical conformation. Accordingly, when the organic metal compound is applied into an organic light emitting diode, it can lower driving voltage of the diode and can improve luminous efficiency and luminous lifespan of the diode. The organic metal compound of the present disclosure may have the following structure of Formula 1:
         [Formula 1]       

     
       
         
         
             
             
         
       
         
         
           
             wherein M is molybdenum (Mo), tungsten (W), rhenium (Re), ruthenium (Ru), osmium (Os), rhodium (Rh), iridium (Ir), palladium (Pd), platinum (Pt) or silver (Ag); each of A, B and C is independently a 5-membered or 6-membered aromatic ring or a 5-membered or 6-membered hetero aromatic ring; each of X 1  and X 2  is independently CR 4 , N or P, one of X 1  and X 2  is CR 4  and the other of X 1  and X 2  is N or P; each of Y 1  and Y 2  is independently selected from the group consisting of BR 5 , CR 5 R 6 , C═O, C═NR 5 , SiR 5 R 6 , NR 5 , PR 5 , AsR 5 , SbR 5 , BiR 5 , P(O)R 5 , P(S)R 5 , P(Se)R 5 , As(O)R 5 , As(S)R 5 , As(Se)R 5 , Sb(O)R 5 , Sb(S)R 5 , Sb(Se)R 5 , Bi(O)R 5 ,Bi(S)R 5 , Bi(Se)R 5 , O, S, Se, Te, SO, SO 2 , SeO, SeO 2 , TeO and TeO 2 ; each of R 1  to R 6  is independently selected from the group consisting of protium, deuterium, halogen, a hydroxyl group, a cyano group, a nitro group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic group, a silyl group, a C 1 -C 20  alkyl silyl group, a C 1 -C 20  alkyl group, a C 1 -C 20  hetero alkyl group, a C 2 -C 20  alkenyl group, a C 2 -C 20  hetero alkenyl group, a C 2 -C 20  alkynyl group, a C 2 -C 20  hetero alkynyl group, a C 1 -C 20  alkoxy group, a C 1 -C 20  alkyl amino group, a C 3 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 30  aromatic group and a C 3 -C 30  hetero aromatic group, or each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  independently forms a C 4 -C 20  alicyclic ring, a C 3 -C 20  hetero alicyclic ring, a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring when each of a, b and c is 2 or more; each of the alkyl group, the hetero alkyl group, the alkenyl group, the hetero alkenyl group, the alkoxy group, the alkyl amino group, the alkyl silyl group, the alicyclic group, the hetero alicyclic group, the aromatic group and the hetero aromatic group of R 1  to R 6  is independently unsubstituted or substituted with at least one of deuterium, halogen, C 1 -C 20  alkyl, a C 4 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 20  aromatic group, a C 3 -C 20  hetero aromatic group; each of the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring formed by each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of a, b and c is a number of substitutent R 1 , R 2  and R 3 , respectively, a is an integer of 0 to 3, b is an integer of 0 to 2 and c is an integer of 0 to 4; 
           
         
       
    
     
       
         
         
             
             
         
       
     
     is an acetylacetonate-based auxiliary ligand; m is an integer of 1 to 3, n is an integer of 0 to 2, wherein m plus n is an oxidation number of M. 
     As used herein, the term “unsubstituted” means that hydrogen is linked, and in this case, hydrogen comprises protium. 
     As used herein, substituent in the term “substituted” comprises, but is not limited to, deuterium, tritium, unsubstituted or deuterium or halogen-substituted C 1 -C 20  alkyl, unsubstituted or deuterium or halogen-substituted C 1 -C 20  alkoxy, halogen, cyano, —CF 3 , a hydroxyl group, a carboxylic group, a carbonyl group, an amino group, a C 1 -C 10  alkyl amino group, a C 6 -C 30  aryl amino group, a C 3 -C 30  hetero aryl amino group, a C 6 -C 30  aryl group, a C 3 -C 30  hetero aryl group, a nitro group, a hydrazyl group, a sulfonate group, a C 1 -C 20  alkyl silyl group, a C 6 -C 30  aryl silyl group and a C 3 -C 30  hetero aryl silyl group. 
     As used herein, the term ‘hetero” in such as “hetero alkyl”, “hetero alkenyl”, “hetero alkynyl”, “a hetero alicyclic group”, “a hetero aromatic group”, “a hetero alicyclic ring”, “a hetero aromatic ring” means that at least one carbon atom, for example 1-5 carbons atoms, constituting an aliphatic chain, an alicyclic group or ring or an aromatic group or ring is substituted with at least one hetero atom selected from the group consisting of N, O, S, P and combination thereof. 
     In one exemplary aspect, when each of R 1  to R 6  in Formula 1 is independently a C 6 -C 30  aromatic group, each of R 1  to R 6  may independently be, but is not limited to, a C 6 -C 30  aryl group, a C 7 -C 30  aryl alkyl group, a C 6 -C 30  aryl oxy group and a C 6 -C 30  aryl amino group. As an example, when each of R 1  to R 6  is independently a C 6 -C 30  aryl group, each of R 1  to R 6  may independently comprise, but is not limited to, an unfused or fused aryl group such as phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, pentalenyl, indenyl, indeno-indenyl, heptalenyl, biphenylenyl, indacenyl, phenalenyl, phenanthrenyl, benzo-phenanthrenyl, dibenzo-phenanthrenyl, azulenyl, pyrenyl, fluoranthenyl, triphenylenyl, chrysenyl, tetraphenylenyl, tetracenyl, pleiadenyl, picenyl, pentaphenylenyl, pentacenyl, fluorenyl, indeno-fluorenyl and spiro-fluorenyl. 
     Alternatively, when each of R 1  to R 6  in Formula 1 is independently a C 3 -C 30  hetero aromatic group, each of R 1  to R 6  may independently be, but is not limited to, a C 3 -C 30  hetero aryl group, a C 4 -C 30  hetero aryl alkyl group, a C 3 -C 30  hetero aryl oxy group and a C 3 -C 30  hetero aryl amino group. As an example, when each of R 1  to R 6  is independently a C 3 -C 30  hetero aryl group, each of R 1  to R 6  may independently comprise, but is not limited to, an unfused or fused hetero aryl group such as pyrrolyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, tetrazinyl, imidazolyl, pyrazolyl, indolyl, iso-indolyl, indazolyl, indolizinyl, pyrrolizinyl, carbazolyl, benzo-carbazolyl, dibenzo-carbazolyl, indolo-carbazolyl, indeno-carbazolyl, benzo-furo-carbazolyl, benzo-thieno-carbazolyl, carbolinyl, quinolinyl, iso-quinolinyl, phthalzinyl, quinoxalinyl, cinnolinyl, quinazolinyl, quinolizinyl, purinyl, benzo-quinolinyl, benzo-iso-quinolinyl, benzo-quinazolinyl, benzo-quinoxalinyl, acridinyl, phenazinyl, phenoxazinyl, phenothiazinyl, phenanthrolinyl, perimidinyl, phenanthridinyl, pteridinyl, naphthyridinyl, furanyl, pyranyl, oxazinyl, oxazolyl, oxadiazolyl, triazolyl, dioxinyl, benzo-furanyl, dibenzo-furanyl, thiopyranyl, xanthenyl, chromenyl, iso-chromenyl, thioazinyl, thiophenyl, benzo-thiophenyl, dibenzo-thiophenyl, difuro-pyrazinyl, benzofuro-dibenzo-furanyl, benzothieno-benzo-thiophenyl, benzothieno-dibenzo-thiophenyl, benzothieno-benzo-furanyl, benzothieno-dibenzo-furanyl, xanthene-linked spiro acridinyl, dihydroacridinyl substituted with at least one C 1 -C 10  alkyl and N-substituted spiro fluorenyl. 
     As an example, each of the aromatic group or the hetero aromatic group of R 1  to R 6  may consist of one to three aromatic or hetero aromatic rings. When the number of the aromatic or hetero aromatic rings of R 1  to R 6  becomes more than four, the whole molecule has too long conjugated structure, thus, the organic metal compound may have too narrow energy bandgap. For example, each of the aryl group or the hetero aryl group of R 1  to R 6  may comprise independently, but is not limited to, phenyl, biphenyl, naphthyl, anthracenyl, pyrrolyl, triazinyl, imidazolyl, pyrazolyl, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, furanyl, benzo-furanyl, dibenzo-furanyl, thiophenyl, benzo-thiophenyl, dibenzo-thiophenyl, carbazolyl, acridinyl, carbolinyl, phenazinyl, phenoxazinyl and/or phenothiazinyl. 
     Alternatively, each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  may form independently an unsubstituted or alkyl-substituted C 4 -C 20  alicyclic ring (e.g. C 4 -C 10  alicyclic ring, an unsubstituted or alkyl-substituted C 3 -C 20  hetero alicyclic ring (e.g. C 3 -C 10  hetero alicyclic ring), an unsubstituted or alkyl-substituted C 6 -C 20  aromatic ring (e.g. C 6 -C 10  aromatic ring), or an unsubstituted or alkyl-substituted C 3 -C 20  hetero aromatic ring (e.g. C 3 -C 10  hetero aromatic ring). The alicyclic ring, the hetero alicyclic ring, the aromatic ring and/or the hetero aromatic ring formed by each of adjacent two of R 1 , adjacent two of R 2  and adjacent two of R 3  are not limited to a particular ring. For example, the aromatic ring or the hetero aromatic ring formed by those groups may include, but is not limited to, a benzene ring, a pyridine ring, an indole ring, a pyran ring and a fluorene ring each of which is optionally substituted with at least one C 1 -C 10  alkyl. 
     The organic metal compound having the structure of Formula 1 has a main ligand having at least five fused rings. The organic metal compound has a rigid chemical conformation, so that its conformation is not rotated in the luminous process, therefore, and it can maintain good luminous lifespan stably. The organic metal compound has specific ranges of photoluminescence emissions by exciton activations, so that its color purity can be improved. 
     In one exemplary aspect, the organic metal compound may be a heteroleptic metal complex including two different bidentate ligands coordinated to the central metal atom, so that the photoluminescence color purity and emission colors of the organic metal compound can be controlled with ease by combining two different bidentate ligands. In addition, it is possible to control the color purity and emission peaks of the organic metal compound by introducing various substituents to each of the ligands. The organic metal compound having the structure of Formula 1 may emit red light and can improve luminous efficiency of an organic light emitting diode. 
     In one exemplary aspect, each of the A ring, the B ring and the C ring in Formula 1 may include independently a 6-membered aromatic ring or a 6-membered hetero aromatic ring. Such an organic metal compound may have the following structure of Formula 2: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of M, X 1 , X 2 , Y 1 , Y 2 , 
           
         
       
    
     
       
         
         
             
             
         
       
     
     m and n is as same as defined in Formula 1; each of X 3  to X 5  is independently selected from the group consisting of CR 7 , N, P, S and O, wherein at least one of X 3  to X 5  is CR 7 ; each of X 6  to X 8  is independently selected from the group consisting of CR 8 , N, P, S and O, wherein at least one of X 6  to X 8  is CR 8 ; each of X 9  and X 10  is independently selected from the group consisting of CR 9 , N, P, S and O, wherein at least one of X 9  and X 10  is CR 9 ; each of R 7  to R 9  is independently selected from the group consisting of protium, deuterium, halogen, a hydroxyl group, a cyano group, a nitro group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic group, a silyl group, a C 1 -C 20  alkyl silyl group, a C 1 -C 20  alkyl group, a C 1 -C 20  hetero alkyl group, a C 2 -C 20  alkenyl group, a C 2 -C 20  hetero alkenyl group, a C 2 -C 20  alkynyl group, a C 2 -C 20  hetero alkynyl group, a C 1 -C 20  alkoxy group, a C 1 -C 20  alkyl amino group, a C 3 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 30  aromatic group and a C 3 -C 30  hetero aromatic group, or each of adjacent two of R 7 , adjacent two of R 8  and adjacent two of R 9  independently forms a C 4 -C 20  alicyclic ring, a C 3 -C 20  hetero alicyclic ring, a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring; each of the alkyl group, the hetero alkyl group, the alkenyl group, the hetero alkenyl group, the alkoxy group, the alkyl amino group, the alkyl silyl group, the alicyclic group, the hetero alicyclic group, the aromatic group and the hetero aromatic group of R 7  to R 9  is independently unsubstituted or substituted with at least one of deuterium, halogen, C 1 -C 20  alkyl, a C 4 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 20  aromatic group, a C 3 -C 20  hetero aromatic group; each of the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring formed by each of adjacent two of R 7 , adjacent two of R 8  and adjacent two of R 9  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group. 
     Each of the aromatic group, the hetero aromatic group, the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring of R 7  to R 9  may be identical to the corresponding groups and the rings of R 1  to R 6  as described above. 
     Alternatively, the central metal atom may comprise iridium and the auxiliary ligand may comprise an acetylacetonate-based ligand. Such an organic metal compound may have the following structure of Formula 3: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of X 1  to X 10 , Y 1  and Y 2  is as same as defined in Formula 2; m is an integer of 1 to 3, n is an integer of 0 to 2, wherein m plus n is 3; each of Z 3  to Z 5  is independently selected from the group consisting of protium, deuterium, halogen, a hydroxyl group, a cyano group, a nitro group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic group, a silyl group, a C 1 -C 20  alkyl silyl group, a C 1 -C 20  alkyl group, a C 1 -C 20  hetero alkyl group, a C 2 -C 20  alkenyl group, a C 2 -C 20  hetero alkenyl group, a C 2 -C 20  alkynyl group, a C 2 -C 20  hetero alkynyl group, a C 1 -C 20  alkoxy group, a C 1 -C 20  alkyl amino group, a C 3 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 30  aromatic group and a C 3 -C 30  hetero aromatic group, or adjacent two of Z 3  to Z 5  form a C 4 -C 20  alicyclic ring, a C 3 -C 20  hetero alicyclic ring, a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring; each of the alkyl group, the hetero alkyl group, the alkenyl group, the hetero alkenyl group, the alkoxy group, the alkyl amino group, the alkyl silyl group, the alicyclic group, the hetero alicyclic group, the aromatic group and the hetero aromatic group of Z 3  to Z 5  is independently unsubstituted or substituted with at least one of deuterium, halogen, C 1 -C 20  alkyl, a C 4 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 20  aromatic group, a C 3 -C 20  hetero aromatic group; each of the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring formed by adjacent two of Z 3  to Z 5  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group. 
           
         
       
    
     Each of the aromatic group, the hetero aromatic group, the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring of Z 3  to Z 5  may be identical to the corresponding groups and the rings of R 1  to R 6  as described above. 
     In another exemplary aspect, the A ring may comprise a 6-membered aromatic ring, the B ring may comprise a 6-membered aromatic ring or a 6-membered hetero aromatic ring having 0 to 1 nitrogen atom and the C ring may comprise a 6-membered aromatic ring or a 6-membered hetero aromatic ring having 0 to 2 nitrogen atoms. As an example, such an organic metal compound may have the following structure of Formula 4: 
     
       
         
         
             
             
         
       
     
     wherein each of M, a, b, m and n is as same as defined in Formula 1; each of X 11  to X 13  is independently CR 15  or N, wherein one of X 11  and X 12  is CR 15  and the other of X 11  and X 12  is N; each of Y 3  and Y 4  is independently CR 16 R 17 , NR 16 , O, S, Se or SiR 16 R 17 ; each of R 11  to R 15  is independently selected from the group consisting of protium, deuterium, a C 1 -C 10  alkyl group, a C 4 -C 20  cyclo alkyl group, a C 4 -C 20  hetero cyclo alkyl group, a C 6 -C 20  aryl group and a C 3 -C 20  hetero aryl group, or each of adjacent two of R 11  and adjacent two of R 12  independently forms a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring unsubstituted or substituted with at least one C 1 -C 10  alkyl group when each of a and b is 2 or more, or adjacent two of R 13  to R 15  form a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of R 16  and R 17  is independently selected from the group consisting of protium, deuterium, a C 1 -C 10  alkyl group, a C 4 -C 20  cyclo alkyl group, a C 4 -C 20  hetero cyclo alkyl group, a C 6 -C 20  aryl group and a C 3 -C 20  hetero aryl group. 
     Each of the aromatic group, the hetero aromatic group, the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring of R 11  to R 17  may be identical to the corresponding groups and the rings of R 1  to R 6  as described above. 
     For example, X 11  in Formula 4 may comprise an unsubstituted or substituted carbon atom, X 12  in Formula 4 may comprise a nitrogen atom. Alternatively, the adjacent two of R 13  to R 15  in Formula 4 may form a C 6 -C 10  aromatic ring or a C 3 -C 10  hetero aromatic ring. 
     In still another exemplary aspect, the organic metal compound having the structure of Formulae 1 to 4 may comprise iridium as a central metal and an acetylacetonate-based ligand as an auxiliary ligand. Such an organic metal compound may have the following structure of Formula 5: 
     
       
         
         
             
             
         
       
     
     wherein each of R 11  to R 14 , X 11  to X 13 , Y 3 , Y 4 , a and b is as same as defined in Formula 4; m is an integer of 1 to 3, n is an integer of 0 to 2, wherein m plus n is 3; each of Z 3  to Z 5  is independently selected from the group consisting of protium, deuterium, halogen, a hydroxyl group, a cyano group, a nitro group, a nitrile group, an isonitrile group, a sulfanyl group, a phosphino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic group, a silyl group, a C 1 -C 20  alkyl silyl group, a C 1 -C 20  alkyl group, a C 1 -C 20  hetero alkyl group, a C 2 -C 20  alkenyl group, a C 2 -C 20  hetero alkenyl group, a C 2 -C 20  alkynyl group, a C 2 -C 20  hetero alkynyl group, a C 1 -C 20  alkoxy group, a C 1 -C 20  alkyl amino group, a C 3 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 30  aromatic group and a C 3 -C 30  hetero aromatic group, or adjacent two of Z 3  to Z 5  form a C 4 -C 20  alicyclic ring, a C 3 -C 20  hetero alicyclic ring, a C 6 -C 20  aromatic ring or a C 3 -C 20  hetero aromatic ring; each of the alkyl group, the hetero alkyl group, the alkenyl group, the hetero alkenyl group, the alkoxy group, the alkyl amino group, the alkyl silyl group, the alicyclic group, the hetero alicyclic group, the aromatic group and the hetero aromatic group of Z 3  to Z 5  is independently unsubstituted or substituted with at least one of deuterium, halogen, C 1 -C 20  alkyl, a C 4 -C 20  alicyclic group, a C 3 -C 20  hetero alicyclic group, a C 6 -C 20  aromatic group, a C 3 -C 20  hetero aromatic group; each of the alicyclic ring, the hetero alicyclic ring, the aromatic ring and the hetero aromatic ring formed by adjacent two of Z 3  to Z 5  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group. 
     More particularly, the organic metal compound having the structure of Formula 1 may be selected from any one having the following structure of Formula 6: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The organic metal compound having any one of the structures of Formula 1 to Formula 6 includes a ligand comprising a fused aromatic or hetero aromatic ring with multiple aromatic or hetero aromatic ring, so that it has a rigid chemical conformation. The organic metal compound can improve its color purity with narrow FWHM (Full-width at half maximum) and can enhance its luminous lifespan because it can maintain its stable chemical conformation in the emission process. In addition, since the organic metal compound may be a metal complex with bidentate ligands, it is possible to control the emission color purity and emission colors with ease. Accordingly, an organic light emitting diode having excellent luminous efficiency can be realized by applying the organic metal compound having the structure of Formulae 1 to 6 into an emissive layer. 
     [Organic Light Emitting Device and Organic Light Emitting Diode] 
     It is possible to realize an OLED having reduced driving voltage and excellent luminous efficiency and improved luminous lifespan by applying the organic metal compound having the structure of Formulae 1 to 6 into an emissive layer, for example an emitting material layer of the OLED. The OLED of the present disclosure may be applied to an organic light emitting device such as an organic light emitting display device or an organic light emitting illumination device. An organic light emitting display device including the OLED will be explained. 
       FIG. 1  is a schematic circuit diagram illustrating an organic light emitting display device in accordance with an exemplary aspect of the present disclosure. As illustrated in  FIG. 1 , a gate line GL, a data line DL and power line PL, each of which cross each other to define a pixel region P, are formed in the organic light emitting display device. A switching thin film transistor Ts, a driving thin film transistor Td, a storage capacitor Cst and an organic light emitting diode D are formed within the pixel region P. The pixel region P may include a red (R) pixel region, a green (G) pixel region and a blue (B) pixel region. 
     The switching thin film transistor Ts is connected to the gate line GL and the data line DL, and the driving thin film transistor Td and the storage capacitor Cst are connected between the switching thin film transistor Ts and the power line PL. The organic light emitting diode D is connected to the driving thin film transistor Td. When the switching thin film transistor Ts is turned on by a gate signal applied into the gate line GL, a data signal applied into the data line DL is applied into a gate electrode of the driving thin film transistor Td and one electrode of the storage capacitor Cst through the switching thin film transistor Ts. 
     The driving thin film transistor Td is turned on by the data signal applied into the gate electrode so that a current proportional to the data signal is supplied from the power line PL to the organic light emitting diode D through the driving thin film transistor Td. And then, the organic light emitting diode D emits light having a luminance proportional to the current flowing through the driving thin film transistor Td. In this case, the storage capacitor Cst is charge with a voltage proportional to the data signal so that the voltage of the gate electrode in the driving thin film transistor Td is kept constant during one frame. Therefore, the organic light emitting display device can display a desired image. 
       FIG. 2  is a schematic cross-sectional view illustrating an organic light emitting display device in accordance with an exemplary aspect of the present disclosure. As illustrated in  FIG. 2 , the organic light emitting display device  100  comprises a substrate  102 , a thin-film transistor Tr over the substrate  102 , and an organic light emitting diode D connected to the thin film transistor Tr. As an example, the substrate  102  defines a red pixel region, a green pixel region and a blue pixel region and the organic light emitting diode D is located in each pixel region. In other words, the organic light emitting diode D, which emits red, green or blue light, is located correspondingly in the red pixel region, the green pixel region and the blue pixel region. 
     The substrate  102  may include, but is not limited to, glass, thin flexible material and/or polymer plastics. For example, the flexible material may be selected from the group of, but is not limited to, polyimide (PI), polyethersulfone (PES), polyethylenenaphthalate (PEN), polyethylene terephthalate (PET), polycarbonate (PC) and combination thereof. The substrate  102 , over which the thin film transistor Tr and the organic light emitting diode D are arranged, forms an array substrate. 
     A buffer layer  106  may be disposed over the substrate  102 , and the thin film transistor Tr is disposed over the buffer layer  106 . The buffer layer  106  may be omitted. 
     A semiconductor layer  110  is disposed over the buffer layer  106 . In one exemplary aspect, the semiconductor layer  110  may include, but is not limited to, oxide semiconductor materials. In this case, a light-shield pattern may be disposed under the semiconductor layer  110 , and the light-shield pattern can prevent light from being incident toward the semiconductor layer  110 , and thereby, preventing the semiconductor layer  110  from being deteriorated by the light. Alternatively, the semiconductor layer  110  may include polycrystalline silicon. In this case, opposite edges of the semiconductor layer  110  may be doped with impurities. 
     A gate insulating layer  120  including an insulating material is disposed on the semiconductor layer  110 . The gate insulating layer  120  may include, but is not limited to, an inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ). 
     A gate electrode  130  made of a conductive material such as a metal is disposed over the gate insulating layer  120  so as to correspond to a center of the semiconductor layer  110 . While the gate insulating layer  120  is disposed over a whole area of the substrate  102  in  FIG. 2 , the gate insulating layer  120  may be patterned identically as the gate electrode  130 . 
     An interlayer insulating layer  140  including an insulating material is disposed on the gate electrode  130  with covering over an entire surface of the substrate  102 . The interlayer insulating layer  140  may include an inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or an organic insulating material such as benzocyclobutene or photo-acryl. 
     The interlayer insulating layer  140  has first and second semiconductor layer contact holes  142  and  144  that expose both sides of the semiconductor layer  110 . The first and second semiconductor layer contact holes  142  and  144  are disposed over opposite sides of the gate electrode  130  with spacing apart from the gate electrode  130 . The first and second semiconductor layer contact holes  142  and  144  are formed within the gate insulating layer  120  in  FIG. 2 . Alternatively, the first and second semiconductor layer contact holes  142  and  144  are formed only within the interlayer insulating layer  140  when the gate insulating layer  120  is patterned identically as the gate electrode  130 . 
     A source electrode  152  and a drain electrode  154 , which are made of conductive material such as a metal, are disposed on the interlayer insulating layer  140 . The source electrode  152  and the drain electrode  154  are spaced apart from each other with respect to the gate electrode  130 , and contact both sides of the semiconductor layer  110  through the first and second semiconductor layer contact holes  142  and  144 , respectively. 
     The semiconductor layer  110 , the gate electrode  130 , the source electrode  152  and the drain electrode  154  constitute the thin film transistor Tr, which acts as a driving element. The thin film transistor Tr in  FIG. 2  has a coplanar structure in which the gate electrode  130 , the source electrode  152  and the drain electrode  154  are disposed over the semiconductor layer  110 . Alternatively, the thin film transistor Tr may have an inverted staggered structure in which a gate electrode is disposed under a semiconductor layer and a source and drain electrodes are disposed over the semiconductor layer. In this case, the semiconductor layer may include amorphous silicon. 
     Although not shown in  FIG. 2 , a gate line and a data line, which cross each other to define a pixel region, and a switching element, which is connected to the gate line and the data line, is may be further formed in the pixel region. The switching element is connected to the thin film transistor Tr, which is a driving element. In addition, a power line is spaced apart in parallel from the gate line or the data line, and the thin film transistor Tr may further include a storage capacitor configured to constantly keep a voltage of the gate electrode for one frame. 
     A passivation layer  160  is disposed on the source and drain electrodes  152  and  154  with covering the thin film transistor Tr over the whole substrate  102 . The passivation layer  160  has a flat top surface and a drain contact hole  162  that exposes the drain electrode  154  of the thin film transistor Tr. While the drain contact hole  162  is disposed on the second semiconductor layer contact hole  144 , it may be spaced apart from the second semiconductor layer contact hole  144 . 
     The organic light emitting diode (OLED) D includes a first electrode  210  that is disposed on the passivation layer  160  and connected to the drain electrode  154  of the thin film transistor Tr. The organic light emitting diode D further includes an emissive layer  230  and a second electrode  220  each of which is disposed sequentially on the first electrode  210 . 
     The first electrode  210  is disposed in each pixel region. The first electrode  210  may be an anode and include conductive material having relatively high work function value. For example, the first electrode  210  may include, but is not limited to, a transparent conductive oxide (TCO) such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), SnO, ZnO, indium cerium oxide (ICO), aluminum doped zinc oxide (AZO), and the like. 
     In one exemplary aspect, when the organic light emitting display device  100  is a bottom-emission type, the first electrode  210  may have a single-layered structure of the TCO. Alternatively, when the organic light emitting display device  100  is a top-emission type, a reflective electrode or a reflective layer may be disposed under the first electrode  210 . For example, the reflective electrode or the reflective layer may include, but are not limited to, silver (Ag) or aluminum-palladium-copper (APC) alloy. In the OLED D of the top-emission type, the first electrode  210  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     In addition, a bank layer  164  is disposed on the passivation layer  160  in order to cover edges of the first electrode  210 . The bank layer  164  exposes a center of the first electrode  210  corresponding to each pixel region. The bank layer  164  may be omitted. 
     An emissive layer  230  is disposed on the first electrode  210 . In one exemplary aspect, the emissive layer  230  may have a single-layered structure of an emitting material layer (EML). Alternatively, the emissive layer  230  may have a multiple-layered structure of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an EML, a hole blocking layer (HBL), an electron transport layer (ETL) and/or an electron injection layer (EIL) (see,  FIGS. 3, 5 and 6 ). In one aspect, the emissive layer  230  may have single emitting part. Alternatively, the emissive layer  230  may have multiple emitting parts to form a tandem structure. 
     The emissive layer  230  may comprise the organic metal compound having the structure of Formulae 1 to 6. The emissive layer  230  including the organic metal compound enables the OLED D and the organic light emitting display device  100  to improve their luminous efficiency and luminous lifespan considerably. 
     The second electrode  220  is disposed over the substrate  102  above which the emissive layer  230  is disposed. The second electrode  220  may be disposed over a whole display area, and may include a conductive material with a relatively low work function value compared to the first electrode  210 , and may be a cathode. For example, the second electrode  220  may include, but is not limited to, aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag), alloy thereof or combination thereof such as aluminum-magnesium alloy (Al—Mg). When the organic light emitting display device  100  is a top-emission type, the second electrode  220  is thin so as to have light-transmissive (semi-transmissive) property. 
     In addition, an encapsulation film  170  may be disposed over the second electrode  220  in order to prevent outer moisture from penetrating into the organic light emitting diode D. The encapsulation film  170  may have, but is not limited to, a laminated structure of a first inorganic insulating film  172 , an organic insulating film  174  and a second inorganic insulating film  176 . The encapsulation film  170  may be omitted. 
     A polarizing plate may be attached onto the encapsulation film to reduce reflection of external light. For example, the polarizing plate may be a circular polarizing plate. When the organic light emitting display device  100  is a bottom-emission type, the polarizing plate may be disposed under the substrate  102 . Alternatively, when the organic light emitting display device  100  is a top-emission type, the polarizing plate may be disposed over the encapsulation film  170 . In addition, a cover window may be attached to the encapsulation film  170  or the polarizing plate when the organic light emitting display device  100  is a top-emission type. In this case, the substrate  102  and the cover window may have a flexible property, thus the organic light emitting display device  100  may be a flexible display device. 
     Now, we will describe the OLED D including the organic metal compound in more detail.  FIG. 3  is a schematic cross-sectional view illustrating an organic light emitting diode having a single emitting part in accordance with an exemplary embodiment of the present disclosure. As illustrated in  FIG. 3 , the organic light emitting diode (OLED) D1 in accordance with the present disclosure includes first and second electrodes  210  and  220  facing each other and an emissive layer  230  disposed between the first and second electrodes  210  and  220 . The organic light emitting display device  100  includes a red pixel region, a green pixel region and a blue pixel region, and the OLED D1 may be disposed in the red pixel region. 
     In an exemplary embodiment, the emissive layer  230  includes an EML  340  disposed between the first and second electrodes  210  and  220 . Also, the emissive layer  230  may comprise at least one of an HTL  320  disposed between the first electrode  210  and the EML  340  and an ETL  360  disposed between the second electrode  220  and the EML  340 . In addition, the emissive layer  230  may further comprise at least one of an HIL  310  disposed between the first electrode  210  and the HTL  320  and an EIL  370  disposed between the second electrode  220  and the ETL  360 . Alternatively, the emissive layer  230  may further comprise a first exciton blocking layer, i.e. an EBL  330  disposed between the HTL  320  and the EML  340  and/or a second exciton blocking layer, i.e. an HBL  350  disposed between the EML  340  and the ETL  360 . 
     The first electrode  210  may be an anode that provides a hole into the EML  340 . The first electrode  210  may include a conductive material having a relatively high work function value, for example, a transparent conductive oxide (TCO). In an exemplary embodiment, the first electrode  210  may include, but is not limited to, ITO, IZO, ITZO, SnO, ZnO, ICO, AZO, and the like. 
     The second electrode  220  may be a cathode that provides an electron into the EML  340 . The second electrode  220  may include a conductive material having a relatively low work function values, i.e., a highly reflective material such as Al, Mg, Ca, Ag, alloy thereof or combination thereof such as Al—Mg. 
     The HIL  310  is disposed between the first electrode  210  and the HTL  320  and improves an interface property between the inorganic first electrode  210  and the organic HTL  320 . In one exemplary embodiment, the HIL  310  may include, but is not limited to, 4,4′4″-Tris(3-methylphenylamino)triphenylamine (MTDATA), 4,4′,4″-Tris(N,N-diphenyl-amino)triphenylamine (NATA), 4,4′,4″-Tris(N-(naphthalene-1-yl)-N-phenyl-amino)triphenylamine (1T-NATA), 4,4′,4″-Tris(N-(naphthalene-2-yl)-N-phenyl-amino)triphenylamine (2T-NATA), Copper phthalocyanine (CuPc), Tris(4-carbazoyl-9-yl-phenyl)amine (TCTA), N,N′-Diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB; NPD), 1,4,5,8,9,11-Hexaazatriphenylenehexacarbonitrile (Dipyrazino[2,3-f:2′3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile; HAT-CN), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), poly(3,4-ethylenedioxythiphene)polystyrene sulfonate (PEDOT/PSS), 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N,N′-diphenyl-N,N′-di[4-(N,N′-diphenyl-amino)phenyl]benzidine (NPNPB) and combination thereof. The HIL  310  may be omitted in compliance of the OLED D1 property. 
     The HTL  320  is disposed adjacently to the EML  340  between the first electrode  210  and the EML  340 . In one exemplary embodiment, the HTL  320  may include, but is not limited to, N,N′-Diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD), NPB (NPD), N,N′-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), Poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)-benzidine] (Poly-TPD), Poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), 1,1-bis(4-(N,N′-di(p-tolyl)amino)phenyl)cyclohexane (TAPC), 3,5-Di(9H-carbazol-9-yl)-N,N-diphenylaniline (DCDPA), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine, N-([1,1′-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine and combination thereof. 
     The EML  340  may comprise a host (first host) and a dopant (first dopant)  342  in which substantial emission is occurred. As an example, the EML  340  may emit red color. For example, the organic metal compound having the structure of Formulae 1 to 6 may be used as the dopant  342  in the EML  340 . 
     The ETL  360  and the EIL  370  may be laminated sequentially between the EML  340  and the second electrode  220 . The ETL  360  includes a material having high electron mobility so as to provide electrons stably with the EML  340  by fast electron transportation. 
     In one exemplary aspect, the ETL  360  may comprise, but is not limited to, at least one of oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, triazine-based compounds, and the like. 
     As an example, the ETL  360  may comprise, but is not limited to, tris-(8-hydroxyquinoline) aluminum (Alq3), Bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), lithium quinolate (Liq),2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), spiro-PBD, 1,3,5-Tris(N-phenylbenzimidazol-2-yl)benzene (TPBi), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-Bis(naphthalene-2-yl)4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 3-(4-Biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(Naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-Tri(p-pyrid-3-yl-phenyl)benzene (TpPyPB), 2,4,6-Tris(3′-(pyridin-3-yl)biphenyl-3-yl)1,3,5-triazine (TmPPPyTz), Poly[(9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]dibromide (PFNBr), tris(phenylquinoxaline) (TPQ), diphenyl-4-triphenylsilyl-phenylphosphine oxide (TSPO1), 2-[4-(9,10-di-2-naphthalen-2-yl-2-anthracen-2-yl)phenyl]1-phenyl-1H-benzimidazole (ZADN) and combination thereof. 
     The EIL  370  is disposed between the second electrode  220  and the ETL  360 , and can improve physical properties of the second electrode  220  and therefore, can enhance the lifetime of the OLED D1. In one exemplary aspect, the EIL  370  may comprise, but is not limited to, an alkali metal halide and/or an alkaline earth metal halide such as LiF, CsF, NaF, BaF 2  and the like, and/or an organic metal compound such as Liq, lithium benzoate, sodium stearate, and the like. Alternatively, the EIL  370  may be omitted. 
     In an alternative aspect, the electron transport material and the electron injection material may be admixed to form a single ETL-EIL. The electron transport material and the electron injection material may be mixed with, but is not limited to, about 4:1 to about 1:4 by weight, for example, about 2:1 to about 1:2. 
     When holes are transferred to the second electrode  220  via the EML  340  and/or electrons are transferred to the first electrode  210  via the EML  340 , the OLED D1 may have short lifetime and reduced luminous efficiency. In order to prevent those phenomena, the OLED D1 in accordance with this aspect of the present disclosure may have at least one exciton blocking layer adjacent to the EML  340 . 
     For example, the OLED D1 may include the EBL  330  between the HTL  320  and the EML  340  so as to control and prevent electron transfers. In one exemplary aspect, the EBL  330  may comprise, but is not limited to, TCTA, Tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, 1,3-bis(carbazol-9-yl)benzene (mCP), 3,3′-bis(N-carbazolyl)-1,1′-biphenyl (mCBP), CuPc, DNTPD, TDAPB, DCDPA, 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene and combination thereof. 
     In addition, the OLED D1 may further include the HBL  350  as a second exciton blocking layer between the EML  340  and the ETL  360  so that holes cannot be transferred from the EML  340  to the ETL  360 . In one exemplary aspect, the HBL  350  may comprise, but is not limited to, at least one of oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, and triazine-based compounds each of which can be used in the ETL  360 . 
     For example, the HBL  350  may comprise a compound having a relatively low HOMO energy level compared to the luminescent materials in EML  340 . The HBL  350  may comprise, but is not limited to, Alq3, BAlq, Liq, PBD, spiro-PBD, BCP, Bis-4,5-(3,5-di-3-pyridylphenyl)-2-methylpyrimidine (B3PYMPM), DPEPO, 9-(6-(9H-carbazol-9-yl)pyridine-3-yl)-9H-3,9′-bicarbazole, TSPO1 and combination thereof. 
     As described above, the EML  340  may comprise the host and the dopant  342 . The dopant  342  may comprise the organic metal compound having the structure of Formulae 1 to 6. 
     The host used with the dopant  342  may comprise, but is not limited to, 9-(3-(9H-carbazol-9-yl)phenyl)-9H-carbazole-3-carbonitrile(mCP-CN), CBP, mCBP, mCP, DPEPO, 2,8-bis(diphenylphosphoryl)dibenzothiphene (PPT), 1,3,5-Tri[(3-pyridyl)-phen-3-yl]benzene (TmPyPB), 2,6-Di(9H-carbazol-9-yl)pyridine (PYD-2Cz), 2,8-di(9H-carbazol-9-yl)dibenzothiophene (DCzDBT), 3′,5′-Di(carbazol-9-yl)-[1,1′-biphenyl]-3,5-dicarbonitrile (DCzTPA), 4′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (pCzB-2CN), 3′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (mCzB-2CN), TSPO1, 9-(9-phenyl-9H-carbazol-6-yl)-9H-carbazole (CCP), 4-(3-(triphenylen-2-yl)phenyl)dibenzo[b,d]thiophene, 9-(4-(9H-carbazol-9-yl)phenyl)-9H-3,9′-bicarbazole, 9-(3-(9H-carbazol-9-yl)phenyl)-9H-3,9′-bicarbazole, 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-9H-3,9′-bicabazole, 9,9′-Diphenyl-9H,9′H-3,3′-bicarbazole (BCzPh), 1,3,5-Tris(carbazole-9-yl)benzene (TCP), TCTA, 4,4′-Bis(carbazole-9-yl)-2,2′-dimethylbiphenyl (CDBP), 2,7-Bis(carbazole-9-yl)-9,9-dimethylfluorene(DMFL-CBP), 2,2′,7,7′-Tetrakis(carbazole-9-yl)-9,9-spiorofluorene (Spiro-CBP), 3,6-Bis(carbazole-9-yl)-9-(2-ethyl-hexyl)-9H-carbazole (TCz1) and combination thereof. For example, the contents of the dopant  342  in the EML  340  may be between about 1 wt % to about 50 wt %, for example, about 1 wt % and about 30 wt %. 
     As described above, since the organic metal compound having the structure of Formulae 1 to 6 has a rigid chemical conformation, it can show excellent color purity and luminous lifespan with maintaining its stable chemical conformation in the luminous process. Changing the structure of the bidentate ligands and substituents to the ligand allows the organic metal compound to control its luminescent color. Accordingly, the OLED D1 can lower its driving voltage and improve its luminous efficiency and luminous lifespan. 
     In the above exemplary first aspect, the OLED and the organic light emitting display device include single emitting part emitting red color. Alternatively, the OLED may include multiple emitting parts (see,  FIG. 5 ) each of which includes an emitting material layer having the organic metal compound having the structure of Formulae 1 to 6. 
     In another exemplary aspect, an organic light emitting display device can implement full-color including white color.  FIG. 4  is a schematic cross-sectional view illustrating an organic light emitting display device in accordance with another exemplary aspect of the present disclosure. 
     As illustrated in  FIG. 4 , the organic light emitting display device  400  comprises a first substrate  402  that defines each of a red pixel region RP, a green pixel region GP and a blue pixel region BP, a second substrate  404  facing the first substrate  402 , a thin film transistor Tr over the first substrate  402 , an organic light emitting diode D disposed between the first and second substrates  402  and  404  and emitting white (W) light and a color filter layer  480  disposed between the organic light emitting diode D and the second substrate  404 . 
     Each of the first and second substrates  402  and  404  may include, but is not limited to, glass, flexible material and/or polymer plastics. For example, each of the first and second substrates  402  and  404  may be made of PI, PES, PEN, PET, PC and combination thereof. The first substrate  402 , over which a thin film transistor Tr and an organic light emitting diode D are arranged, forms an array substrate. 
     A buffer layer  406  may be disposed over the first substrate  402 , and the thin film transistor Tr is disposed over the buffer layer  406  correspondingly to each of the red pixel region RP, the green pixel region GP and the blue pixel region BP. The buffer layer  406  may be omitted. 
     A semiconductor layer  410  is disposed over the buffer layer  406 . The semiconductor layer  410  may be made of oxide semiconductor material or polycrystalline silicon. 
     A gate insulating layer  420  including an insulating material, for example, inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ) is disposed on the semiconductor layer  410 . 
     A gate electrode  430  made of a conductive material such as a metal is disposed over the gate insulating layer  420  so as to correspond to a center of the semiconductor layer  410 . An interlayer insulting layer  440  including an insulating material, for example, inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or an organic insulating material such as benzocyclobutene or photo-acryl, is disposed on the gate electrode  430 . 
     The interlayer insulating layer  440  has first and second semiconductor layer contact holes  442  and  444  that expose both sides of the semiconductor layer  410 . The first and second semiconductor layer contact holes  442  and  444  are disposed over opposite sides of the gate electrode  430  with spacing apart from the gate electrode  430 . 
     A source electrode  452  and a drain electrode  454 , which are made of a conductive material such as a metal, are disposed on the interlayer insulating layer  440 . The source electrode  452  and the drain electrode  454  are spaced apart from each other with respect to the gate electrode  430 , and contact both sides of the semiconductor layer  410  through the first and second semiconductor layer contact holes  442  and  444 , respectively. 
     The semiconductor layer  410 , the gate electrode  430 , the source electrode  452  and the drain electrode  454  constitute the thin film transistor Tr, which acts as a driving element. 
     Although not shown in  FIG. 4 , a gate line and a data line, which cross each other to define a pixel region, and a switching element, which is connected to the gate line and the data line, is may be further formed in the pixel region. The switching element is connected to the thin film transistor Tr, which is a driving element. In addition, a power line is spaced apart in parallel from the gate line or the data line, and the thin film transistor Tr may further include a storage capacitor configured to constantly keep a voltage of the gate electrode for one frame. 
     A passivation layer  460  is disposed on the source and drain electrodes  452  and  454  with covering the thin film transistor Tr over the whole first substrate  402 . The passivation layer  460  has a drain contact hole  462  that exposes the drain electrode  454  of the thin film transistor Tr. 
     The organic light emitting diode (OLED) D is located over the passivation layer  460 . The OLED D includes a first electrode  510  that is connected to the drain electrode  454  of the thin film transistor Tr, a second electrode  520  facing the first electrode  510  and an emissive layer  530  disposed between the first and second electrodes  510  and  520 . 
     The first electrode  510  formed for each pixel region may be an anode and may include a conductive material having relatively high work function value. For example, the first electrode  510  may include, ITO, IZO, ITZO, SnO, ZnO, ICO, AZO, and the like. Alternatively, a reflective electrode or a reflective layer may be disposed under the first electrode  510 . For example, the reflective electrode or the reflective layer may include, but is not limited to, Ag or APC alloy. 
     A bank layer  464  is disposed on the passivation layer  460  in order to cover edges of the first electrode  510 . The bank layer  464  exposes a center of the first electrode  510  corresponding to each of the red pixel region RP, the green pixel region GP and the blue pixel region BP. The bank layer  464  may be omitted. 
     An emissive layer  530  that may include multiple emitting parts is disposed on the first electrode  510 . As illustrated in  FIGS. 5 and 6 , the emissive layers  530  and  530 A may include multiple emitting parts  600 ,  700 ,  700 A and  800  and at least one charge generation layer  680  and  780 . Each of the emitting parts  600 ,  700 ,  700 A and  800  includes at least one emitting material layer and may further include an HIL, an HTL, an EBL, an HBL, an ETL and/or an EIL. 
     The second electrode  520  is disposed over the first substrate  402  above which the emissive layer  530  is disposed. The second electrode  520  may be disposed over a whole display area, and may include a conductive material with a relatively low work function value compared to the first electrode  510 , and may be a cathode. For example, the second electrode  520  may include, but is not limited to, Al, Mg, Ca, Ag, alloy thereof or combination thereof such as Al—Mg. 
     Since the light emitted from the emissive layer  530  is incident to the color filter layer  480  through the second electrode  520  in the organic light emitting display device  400  in accordance with the second embodiment of the present disclosure, the second electrode  520  has a thin thickness so that the light can be transmitted. 
     The color filter layer  480  is disposed over the OLED D and includes a red color filter  482 , a green color filter  484  and a blue color filter  486  each of which is disposed correspondingly to the red pixel region RP, the green pixel region GP and the blue pixel region BP, respectively. Although not shown in  FIG. 4 , the color filter layer  480  may be attached to the OLED D through an adhesive layer. Alternatively, the color filter layer  480  may be disposed directly on the OLED D. 
     In addition, an encapsulation film may be disposed over the second electrode  520  in order to prevent outer moisture from penetrating into the OLED D. The encapsulation film may have, but is not limited to, a laminated structure of a first inorganic insulating film, an organic insulating film and a second inorganic insulating film (see,  170  in  FIG. 2 ). In addition, a polarizing plate may be attached onto the second substrate  404  to reduce reflection of external light. For example, the polarizing plate may be a circular polarizing plate. 
     In  FIG. 4 , the light emitted from the OLED D is transmitted through the second electrode  520  and the color filter layer  480  is disposed over the OLED D. In other words, the organic light emitting display device  400  is a top-emission type. Alternatively, when the organic light emitting display device  400  is a bottom-emission type, the light emitted from the OLED D is transmitted through the first electrode  510  and the color filter layer  480  may be disposed between the OLED D and the first substrate  402 . 
     In addition, a color conversion layer may be disposed between the OLED D and the color filter layer  480 . The color conversion layer may include a red color conversion layer, a green color conversion layer and a blue color conversion layer each of which is disposed correspondingly to each pixel region (RP, GP and BP), respectively, so as to covert the white (W) color light to each of a red, green and blue color lights, respectively. For example, the color conversion layer may include quantum dot. The color conversion layer allows the organic light emitting display device  400  to have much enhanced color purity. Alternatively, the organic light emitting display device  400  may comprise the color conversion layer instead of the color filter layer  480 . 
     As described above, the white (W) color light emitted from the OLED D is transmitted through the red color filter  482 , the green color filter  484  and the blue color filter  486  each of which is disposed correspondingly to the red pixel region RP, the green pixel region GP and the blue pixel region BP, respectively, so that red, green and blue color lights are displayed in the red pixel region RP, the green pixel region GP and the blue pixel region BP, respectively. 
       FIG. 5  is a schematic cross-sectional view illustrating an organic light emitting diode having a tandem structure of two emitting parts. As illustrated in  FIG. 5 , the organic light emitting diode (OLED) D2 in accordance with the exemplary embodiment includes first and second electrodes  510  and  520  and an emissive layer  530  disposed between the first and second electrodes  510  and  520 . The emissive layer  530  includes a first emitting part  600  disposed between the first and second electrodes  510  and  520 , a second emitting part  700  disposed between the first emitting part  600  and the second electrode  520  and a charge generation layer (CGL)  680  disposed between the first and second emitting parts  600  and  700 . 
     The first electrode  510  may be an anode and may include a conductive material having relatively high work function value, for example, TCO. In an exemplary aspect, the first electrode  510  may include, but is not limited to, ITO, IZO, ITZO, SnO, ZnO, ICO, AZO, and the like. The second electrode  520  may be a cathode and may include a conductive material with a relatively low work function value. For example, the second electrode  520  may include, but is not limited to, Al, Mg, Ca, Ag, alloy thereof or combination thereof such as Al—Mg. 
     The first emitting part  600  comprises a first EML (EML1)  640 . The first emitting part  600  may further comprise at least one of an HIL  610  disposed between the first electrode  510  and the EML1  640 , a first HTL (HTL1)  620  disposed between the HIL  610  and the EML1  640  and a first ETL (ETL1)  660  disposed between the EML1  640  and the CGL  680 . Alternatively, the first emitting part  600  may further comprise a first EBL (EBL1)  630  disposed between the HTL1  620  and the EML1  640  and/or a first HBL (HBL1)  650  disposed between the EML1  640  and the ETL1  660 . 
     The second emitting part  700  comprise a second EML (EML2)  740 . The second emitting part  700  may further comprise at least one of a second HTL (HTL2)  720  disposed between the CGL  680  and the EML2  740 , a second ETL (ETL2)  760  disposed between the second electrode  520  and the EML2  740  and an EIL  770  disposed between the second electrode  520  and the ETL2  760 . Alternatively, the second emitting part  700  may further comprise a second EBL (EBL2)  730  disposed between the HTL2  720  and the EML2  740  and/or a second HBL (HBL2)  750  disposed between the EML2  740  and the ETL2  760 . 
     At least one of the EML1  640  and the EML2  740  may comprise the organic metal compound having the structure of Formulae 1 to 6 to emit red color. The other of the EML1  640  and the EML2  740  may emit a blue color so that the OLED D2 can realize white (W) emission. Hereinafter, the OLED D2 where the EML2  740  includes the organic metal compound having the structure of Formulae 1 to 6 will be described in detail. 
     The HIL  610  is disposed between the first electrode  510  and the HTL1  620  and improves an interface property between the inorganic first electrode  510  and the organic HTL1  620 . In one exemplary embodiment, the HIL  610  may include, but is not limited to, MTDATA, NATA, 1T-NATA, 2T-NATA, CuPc, TCTA, NPB (NPD), HAT-CN, TDAPB, PEDOT/PSS, F4TCNQ, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, NPNPB and combination thereof. The HIL  610  may be omitted in compliance of the OLED D2 property. 
     Each of the HTL1  620  and the HTL2  720  may comprise, but is not limited to, TPD, NPB (NPD), DNTPD, CBP, Poly-TPD, TFB, TAPC, DCDPA, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine, N-([1,1′-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine and combination thereof, respectively. 
     Each of the ETL1  660  and the ETL2  760  facilitates electron transportation in each of the first emitting part  600  and the second emitting part  700 , respectively. As an example, each of the ETL1  660  and the ETL2  760  may independently comprise, but is not limited to, at least one of oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, triazine-based compounds, and the like. For example, each of the ETL1  660  and the ETL2  770  may comprise, but is not limited to, Alq3, BAlq, Liq, PBD, spiro-PBD, TPBi, Bphen, NBphen, BCP, TAZ, NTAZ, TpPyPB, TmPPPyTz, PFNBr, TPQ, TSPO1, ZADN and combination thereof, respectively. 
     The EIL  770  is disposed between the second electrode  520  and the ETL2  760 , and can improve physical properties of the second electrode  520  and therefore, can enhance the lifetime of the OLED D2. In one exemplary aspect, the EIL  770  may comprise, but is not limited to, an alkali metal halide and/or an alkaline earth metal halide such as LiF, CsF, NaF, BaF 2  and the like, and/or an organic metal compound such as Liq, lithium benzoate, sodium stearate, and the like. 
     Each of the EBL1  630  and the EBL2  730  may independently comprise, but is not limited to, TCTA, Tri s[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, mCP, mCBP, CuPc, DNTPD, TDAPB, DCDPA, 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene and combination thereof, respectively. 
     Each of the HBL1  650  and the HBL2  750  may comprise, but is not limited to, at least one of oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, and triazine-based compounds each of which can be used in the ETL1  660  and the ETL2  760 . For example, each of the HBL1  650  and the HBL2  750  may independently comprise, but is not limited to, Alq3, BAlq, Liq, PBD, spiro-PBD, BCP, B3PYMPM, DPEPO, 9-(6-(9H-carbazol-9-yl)pyridine-3-yl)-9H-3,9′-bicarbazole, TSPO1 and combination thereof, respectively. 
     The CGL  680  is disposed between the first emitting part  600  and the second emitting part  700 . The CGL  680  includes an N-type CGL (N-CGL)  685  disposed adjacently to the first emitting part  600  and a P-type CGL (P-CGL)  690  disposed adjacently to the second emitting part  700 . The N-CGL  685  transports electrons to the EML1  640  of the first emitting part  600  and the P-CGL  690  transport holes to the EML2  740  of the second emitting part  700 . 
     The N-CGL  685  may be an organic layer doped with an alkali metal such as Li, Na, K and Cs and/or an alkaline earth metal such as Mg, Sr, Ba and Ra. The host in the N-CGL  685  may comprise, but is not limited to, Bphen and MTDATA. The contents of the alkali metal or the alkaline earth metal in the N-CGL  685  may be between about 0.01 wt % and about 30 wt %. 
     The P-CGL  690  may comprise, but is not limited to, inorganic material selected from the group consisting of WO x , MoO x , V 2 O 5  and combination thereof and/or organic material selected from the group consisting of NPD, HAT-CN, F4TCNQ, TPD, N,N,N′,N′-tetranaphthalenyl-benzidine (TNB), TCTA, N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) and combination thereof. 
     The EML1  640  may be a blue EML. In this case, the EML1  640  may be a blue EML, a sky-blue EML or a deep-blue EML. The EML1  640  may include a host and a blue dopant. The host may be identical to the first host and the blue dopant may comprise at least one of blue phosphorescent material, blue fluorescent material and blue delayed fluorescent material. 
     The EML2  740  may comprise a lower EML  740 A disposed between the EBL2  730  and the HBL2  750  and an upper EML  740 B disposed between the lower EML  740 A and the HBL2  750 . One of the lower EML  740 A and the upper EML  740 B may emit red color and the other of the lower EML  740 A and the upper EML  740 B may emit green color. Hereinafter, the EML2  740  where the lower EML  740 A emits red color and the upper EML  740 B emits green color will be described in detail. 
     The lower EML  740 A includes a first host and a first dopant  742 . The first host may comprise, but is not limited to, mCP-CN, CBP, mCBP, mCP, DPEPO, PPT, TmPyPB, PYD-2Cz, DCzDBT, DCzTPA, pCzB-2CN, mCzB-2CN, TSPO1, CCP, 4-(3-(triphenylen-2-yl)phenyl)dibenzo[b,d]thiophene, 9-(4-(9H-carbazol-9-yl)phenyl)-9H-3,9′-bicarbazole, 9-(3-(9H-carbazol-9-yl)phenyl)-9H-3,9′-bicarbazole, 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-9H-3,9′-bicabazole, BCzPh, TCP, TCTA, CDBP, DMFL-CBP, Spiro-CBP, TCz1 and combination thereof. The first dopant  742  may include the organic metal compound having the structure of Formulae 1 to 6 to emit red color. For example, the contents of the first dopant  742  in the lower EML  740 A may be between about 1 wt % to about 50 wt %, for example, about 1 wt % and about 30 wt %. 
     The upper EML  740 B includes a host and a green dopant. The host may be identical to the first host and the green dopant may comprise at least one of green phosphorescent material, green florescent material and green delayed fluorescent material. 
     The OLED D2 in accordance with this aspect has a tandem structure and includes the organic metal compound having the structure of Formulae 1 to 6. The OLED D2 including the organic metal compound with excellent thermal property, a rigid chemical conformation and adjustable luminescent colors can lower its driving voltage and improve its luminous efficiency and luminous lifespan. 
     The OLED may have three or more emitting parts to form a tandem structure.  FIG. 6  is a schematic cross-sectional view illustrating an organic light emitting diode in accordance with still another exemplary aspect of the present disclosure. As illustrated in  FIG. 6 , the organic light emitting diode (OLED) D3 includes first and second electrodes  510  and  520  facing each other and an emissive layer  530 A disposed between the first and second electrodes  510  and  520 . The emissive layer  530 A includes a first emitting part  600  disposed between the first and second electrodes  510  and  520 , a second emitting part  700 A disposed between the first emitting part  600  and the second electrode  520 , a third emitting part  800  disposed between the second emitting part  700 A and the second electrode  520 , a first charge generation layer (CGL1)  680  disposed between the first and second emitting parts  600  and  700 A, and a second charge generation layer (CGL2)  780  disposed between the second and third emitting parts  700 A and  800 . 
     The first emitting part  600  comprise a first EML (EML1)  640 . The first emitting part  600  may further comprise at least one of an HIL  610  disposed between the first electrode  510  and the EML1  640 , a first HTL (HTL1)  620  disposed between the HIL  610  and the EML1  640  and a first ETL (ETL1)  660  disposed between the EML1  640  and the CGL  680 . Alternatively, the first emitting part  600  may further comprise a first EBL (EBL1)  630  disposed between the HTL1  620  and the EML1  640  and/or a first HBL (HBL1)  650  disposed between the EML1  640  and the ETL1  660 . 
     The second emitting part  700 A comprise a second EML (EML2)  740 . The second emitting part  700 A may further comprise at least one of a second HTL (HTL2)  720  disposed between the CGL1  680  and the EML2  740  and a second ETL (ETL2)  760  disposed between the second electrode  520  and the EML2  740 . Alternatively, the second emitting part  700 A may further comprise a second EBL (EBL2)  730  disposed between the HTL2  720  and the EML2  740  and/or a second HBL (HBL2)  750  disposed between the EML2  740  and the ETL2  760 . 
     The third emitting part  800  comprise a third EML (EML3)  840 . The third emitting part  800  may further comprise at least one of a third HTL (HTL3)  820  disposed between the CGL2  780  and the EML3  840 , a third ETL (ETL3)  860  disposed between the second electrode  520  and the EML3  840  and an EIL  870  disposed between the second electrode  520  and the ETL3  860 . Alternatively, the third emitting part  800  may further comprise a third EBL (EBL3)  830  disposed between the HTL3  820  and the EML3  840  and/or a third HBL (HBL3)  850  disposed between the EML3  840  and the ETL3  860 . 
     At least one of the EML1  640 , the EML2  740  and the EML3  840  may comprise the organic metal compound having the structure of Formulae 1 to 6. For example, one of the EML1  640 , the EML2  740  and the EML3  840  may emit red color. In addition, another two of the EML1  640 , the EML2  740  and the EML3  840  emit a blue color so that the OLED D3 can realize white emission. Hereinafter, the OLED where the EML2  740  includes the organic metal compound having the structure of Formulae 1 to 6 to emit red color and each of the EML1  640  and the EML3  840  emits a blue light will be described in detail. 
     The CGL1  680  is disposed between the first emitting part  600  and the second emitting part  700 A and the CGL2  780  is disposed between the second emitting part  700 A and the third emitting part  800 . The CGL1  680  includes a first N-type CGL (N-CGL1)  685  disposed adjacently to the first emitting part  600  and a first P-type CGL (P-CGL1)  690  disposed adjacently to the second emitting part  700 A. The CGL2  780  includes a second N-type CGL (N-CGL2)  785  disposed adjacently to the second emitting part  700 A and a second P-type CGL (P-CGL2)  790  disposed adjacently to the third emitting part  800 . Each of the N-CGL1  685  and the N-CGL2  785  transports electrons to the EML1  640  of the first emitting part  600  and the EM1L2 740 of the second emitting part  700 A, respectively, and each of the P-CGL1  690  and the P-CGL2  790  transport holes to the EML2  740  of the second emitting part  700 A and the EML3  840  of the third emitting part  800 , respectively. 
     Each of the EML1  640  and the EML3  840  may be independently a blue EML. In this case, each of the EML1  640  and the EML3  840  may be independently a blue EML, a sky-blue EML or a deep-blue EML. Each of the EML1  640  and the EML3  840  may include independently a host and a blue dopant. The host may be identical to the first host and the blue dopant may comprise at least one of blue phosphorescent material, blue fluorescent material and blue delayed fluorescent material. In one exemplary aspect, the blue dopant in the EML1  640  may have different color and luminous efficiency from the blue dopant in the EML3  840 . 
     The E-L2  740  may comprise a lower EML  740 A disposed between the EBL2  730  and the HBL2  750  and an upper EML  740 B disposed between the lower EML  740 A and the HBL2  750 . One of the lower EML  740 A and the upper EML  740 B may emit red color and the other of the lower EML  740 A and the upper EML  740 B may emit green color. Hereinafter, the EML2  740  where the lower EML  740 A emits red color and the upper EML  740 B emits green color will be described in detail. 
     The lower EML  740 A may include a first host and a first dopant  742 . As an example, the first dopant  742  includes the organic metal compound having the structure of Formulae 1 to 6 to emit red color. For example, the contents of the first dopant  742  in the lower EML  740 A may be between about 1 wt % to about 50 wt %, for example, about 1 wt % and about 30 wt %. 
     The upper EML  740 B includes a host and a green dopant. The host may be identical to the first host and the green dopant may include at least one of green phosphorescent material, green fluorescent material and green delayed fluorescent material. 
     The OLED D3 in accordance with this aspect includes the organic metal compound having the structure of Formulae 1 to 6 in at least one emitting material layer. The organic metal compound can maintain its stable chemical conformations in the luminescent process. The OLED including the organic metal compound and having three emitting parts can realize white luminescence with improved luminous efficiency, color purity and luminous lifespan. 
     Synthesis Example 1: Synthesis of Compound 1 
     (1) Synthesis of Intermediate A-1 
     
       
         
         
             
             
         
       
     
     1-bromo-3-fluoro-2-iodobenzene (100 g, 332.35 mmol), 2-bromo-6-hydroxyphenyl boronic acid (72.1 g, 332.35 mmol), Na 2 SO 4  (141.6 g, 997.04 mmol) dissolved in THE (1000 ml) were put into a reaction vessel, Pd(PPh 3 ) 4  (tetrakis(triphenylphosphine)palladium(0), 19.2 g, 16.62 mmol) was added into the reaction vessel, and then the solution was stirred at 80° C. for 12 hours. After the reaction was complete, the temperature of the solution was cooled to room temperature (RT), and an organic layer was extracted with toluene. MgSO 4  was put into the organic layer, and the organic layer was filtered. The filtrate was distilled under reduced pressure, and then the mixture was recrystallized with chloroform/ethanol to give the Intermediate A-1 (60.9 g, yield: 53%). 
     MS (m/z): 343.88 
     (2) Synthesis of Intermediate A-2 
     
       
         
         
             
             
         
       
     
     The Intermediate A-1 (60.9 g, 176.02 mmol) dissolved in DMF (400 ml) was put into a reaction vessel, K 2 CO 3  (69.8 g, 528.05 mmol) was added into the reaction vessel, and then the solution was stirred at 100° C. for 1 hour. After the reaction was complete, the temperature of the solution was cooled to RT, and ethanol (100 ml) was added slowly into the solution. After the mixture was distilled under reduced pressure, then the mixture was recrystallized with chloroform/ethyl acetate to give the Intermediate A-2 (43.0 g, yield: 75%). 
     MS (m/z): 323.88 
     (3) Synthesis of Intermediate A-3 
     
       
         
         
             
             
         
       
     
     The Intermediate A-2 (40 g, 122.71 mmol), bis(pinacolato)diboron (35.0 g, 147.25 mmol), Pd(dppf)Cl 2  ([1,1′-bis(diphenylphosphino)ferrocene]palladium(II)dichloride, 4.5 g, 6.14 mmol), KOAc (36.1 g, 368.12 mmol) dissolved in 1,4-dioxane (500 ml) were put into a reaction vessel, and then the solution was stirred at 100° C. for 4 hours. The temperature of the reactants was cooled to RT, an organic layer were extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate A-3 (35.7 g, yield: 78%). 
     MS (m/z): 372.05 
     (4) Synthesis of Intermediate A-4 
     
       
         
         
             
             
         
       
     
     Compound SM-1 (10.0 g, 52.19 mmol), the Intermediate A-3 (23.4 g, 62.63 mmol), Pd(OAc) 2  (Palladium(II) acetate, 1.2 g, 10 mol %), PPh 3  (triphenylphosphine, 6.8 g, 26.09 mmol), NaOAc (17.1 g, 208.76 mmol) dissolved in DMF (200 ml) were put into a reaction vessel, and then the solution was stirred at 120° C. for 16 hours. After the reaction was complete, the temperature of the solution was cooled to RT, an organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: ethyl acetate and hexane) to give the Intermediate A-4 (10.6 g, yield: 63%). 
     MS (m/z): 321.08 
     (5) Synthesis of Intermediate A-5 
     
       
         
         
             
             
         
       
     
     The Intermediate A-4 (10.6 g, 32.99 mmol) dissolved in diethyl ether (200 ml) was put into a reaction vessel, and then AlCl 3  (5.3 g, 39.59 mmol) was added slowly into the reaction vessel. After the solution was stirred for 15 minutes, cooled to 0° C., LAH (lithium aluminum hydride, 1.9 g, 49.48 mmol) was added slowly into the reaction vessel, and then the reactants ware stirred at 50° C. for 1 hour. The temperature of the reactants was cooled to RT, ethyl acetate was added slowly into the reactants, and then HCl (200 ml) was added into the reactants. An organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: ethyl acetate and hexane) to give the Intermediate A-5 (9.1 g, yield: 90%). 
     MS (m/z): 307.1 
     (6) Synthesis of Intermediate A-6 
     
       
         
         
             
             
         
       
     
     The Intermediate A-5 (9.1 g, 29.61 mmol) dissolved in DMSO (200 ml) was put into a reaction vessel, sodium tert-butoxide (21.3 g, 227.07 mmol) was added into the reaction vessel at RT, and then the solution was stirred at 70° C. for 15 minutes. Methyl iodide (33.6 g, 236.87 mmol) was added slowly into the reaction vessel, and then the solution was stirred again for 1 hour. After the reaction was complete, the temperature of the solution was cooled to RT, distilled water added into the solution, the solution was stirred for 20 minutes to produce a solid, and then the solid was filtered. The filtrate was recrystallized with methanol and acetone to give the Intermediate A-6 (5.3 g, yield: 53%). 
     MS (m/z): 335.13 
     (7) Synthesis of Intermediate A-7 
     
       
         
         
             
             
         
       
     
     The Intermediate A-6 (5 g, 14.9 mmol) dissolved in 2-ethoxyethanol (100 ml) and distilled water (30 ml) was put into a reaction vessel, the solution was bubbled with nitrogen for 1 hour, IrCl 3 —H 2 O (2.1 g, 6.78 mmol) was added into the reaction vessel, and then the solution was refluxed for 2 days. After the reaction was complete, the temperature of the solution was cooled to RT slowly to produce a solid, and then the solid was filtered. The filtered solid was washed with hexane and methanol and then dried to give the Intermediate A-7 (2.1 g, yield: 34%). 
     (8) Synthesis of Compound 1 
     
       
         
         
             
             
         
       
     
     The Intermediate A-7 (2.1 g, 1.2 mmol), acetylacetone (1.2 g, 11.71 mmol), Na 2 CO 3  (2.5 g, 23.4 mmol) dissolved in 2-ethoxyethanol (100 ml) were put into a reaction vessel, and then the solution was stirred slowly for 24 hours. After the reaction was complete, dichloromethane was added into the reactants to dissolve a product, and then an organic layer was extracted with dichloromethane and water. Water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and dichloromethane) to give Compound 1 (1.2 g, yield: 55%). 
     MS (m/z): 960.25 
     Synthesis Example 2: Synthesis of Compound 52 
     (1) Synthesis of Intermediate B-1 
     
       
         
         
             
             
         
       
     
     The Intermediate B-1 (14.4 g, yield 71%) was obtained with the same synthetic process of the Intermediate A-4, except that the Compound SM-2 (10.0 g, 70.64 mmol) and the Compound SM-3 (33.0 g, 84.77 mmol) were used as reactants instead of the Compound SM-1 (10.0 g, 52.19 mmol) and the Intermediate A-3 (23.4 g, 62.63 mmol). 
     MS (m/z): 287.04 
     (2) Synthesis of Intermediate B-2 
     
       
         
         
             
             
         
       
     
     The Intermediate B-2 (12.9 g, yield: 94%) was obtained with the same synthetic process of the Intermediate A-5, except that the Intermediate B-1 (14.4 g, 50.16 mmol) was used as a reactant instead of the Intermediate A-4 (10.6 g, 32.99 mmol). 
     MS (m/z): 273.06 
     (3) Synthesis of Intermediate B-3 
     
       
         
         
             
             
         
       
     
     The Intermediate B-3 (7.8 g, yield: 55%) was obtained with the same synthetic process of the Intermediate A-6, except that the Intermediate B-2 (12.9 g, 47.15 mmol) was used as a reactant instead of the Intermediate A-5 (9.1 g, 29.61 mmol). 
     MS (m/z): 301.09 
     (4) Synthesis of Intermediate B-4 
     
       
         
         
             
             
         
       
     
     The Intermediate B-4 (2.9 g, yield: 47%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate B-3 (5 g, 16.59 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (5) Synthesis of Compound 52 
     
       
         
         
             
             
         
       
     
     Compound 52 (1.6 g, yield: 51%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate B-4 (2.9 g, 1.77 mmol) was used as a reactant instead of the Intermediate A-7 (2.1 g, 1.2 mmol). 
     MS (m/z): 892.18 
     Synthesis Example 3: Synthesis of Compound 53 
     (1) Synthesis of Intermediate C-1 
     
       
         
         
             
             
         
       
     
     The Intermediate C-1 (18.8 g, yield 77%) was obtained with the same synthetic process of the Intermediate A-4, except that the Compound SM-2 (10.0 g, 70.64 mmol) and the Compound SM-4 (38.0 g, 84.77 mmol) were used as reactants instead of the Compound SM-1 (10.0 g, 52.19 mmol) and the Intermediate A-3 (23.4 g, 62.63 mmol). 
     MS (m/z): 346.11 
     (2) Synthesis of Intermediate C-2 
     
       
         
         
             
             
         
       
     
     The Intermediate C-2 (16.5 g, yield: 91%) was obtained with the same synthetic process of the Intermediate A-5, except that the Intermediate C-1 (18.8 g, 54.39 mmol) was used as a reactant instead of the Intermediate A-4 (10.6 g, 32.99 mmol). 
     MS (m/z): 332.13 
     (3) Synthesis of Intermediate C-3 
     
       
         
         
             
             
         
       
     
     The Intermediate C-3 (8.6 g, yield: 48%) was obtained with the same synthetic process of the Intermediate A-6, except that the Intermediate C-2 (16.5 g, 49.50 mmol) was used as a reactant instead of the Intermediate A-5 (9.1 g, 29.61 mmol). 
     MS (m/z): 360.16 
     (4) Synthesis of Intermediate C-4 
     
       
         
         
             
             
         
       
     
     The Intermediate C-4 (3.1 g, yield: 52%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate C-3 (5 g, 13.9 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (5) Synthesis of Compound 53 
     
       
         
         
             
             
         
       
     
     Compound 53 (1.6 g, yield: 49%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate C-4 (3.1 g, 1.64 mmol) was used as a reactant instead of the Intermediate A-7 (2.1 g, 1.2 mmol). 
     MS (m/z): 1010.32 
     Synthesis Example 4: Synthesis of Compound 86 
     (1) Synthesis of Intermediate D-1 
     
       
         
         
             
             
         
       
     
     The Compound SM-5 (10.0 g, 61.12 mmol), the Compound SM-6 (22.7 g, 67.24 mmol), Pd(OAc) 2  (0.7 g, 3.06 mol), PPh 3  (3.2 g, 12.22 mmol), K 2 CO 3  (25.3 g, 183.37 mmol) dissolved in 1,4-dioxane (150 ml) and water (150 ml) were put into a reaction vessel, and then the solution was stirred at 100° C. for 12 hours. After the reaction was complete, the temperature of the solution was cooled to RT, an organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduce pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate D-1 (12.9 g, yield: 68%). 
     MS (m/z): 310.11 
     (2) Synthesis of Intermediate D-2 
     
       
         
         
             
             
         
       
     
     The Intermediate D-1 (12.9 g, 41.56 mmol) dissolved in DMSO (200 ml) was put into a reaction vessel, CuI (11.9 g, 62.35 mmol) was put into the reaction vessel, and then the solution was refluxed at 150° C. for 12 hours. After the reaction was complete, the solution was filtered, an organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate D-2 (4.7 g, yield: 37%). 
     MS (m/z): 308.09 
     (3) Synthesis of Intermediate D-3 
     
       
         
         
             
             
         
       
     
     The Intermediate D-2 (4.7 g, 15.38 mmol), 1-iodobenzene (3.4 g, 16.77 mmol) dissolved in toluene (200 ml) were put into a reaction vessel, Pd 2 (dba) 3  (Tris(dibenzylideneacetone)dipalladium(0), 0.7 g, 0.76 mmol), P(t-Bu) 3  (0.3 g, 1.52 mmol) and NaOt-Bu (2.9 g, 30.49 mmol) were added into the reaction vessel, and then the solution was refluxed at 100° C. for 24 hours. After the reaction was complete, an organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate D-3 (5.0 g, yield: 85%). 
     MS (m/z): 384.13 
     (4) Synthesis of Intermediate D-4 
     
       
         
         
             
             
         
       
     
     The Intermediate D-4 (2.6 g, yield: 44%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate D-3 (5 g, 13.01 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (5) Synthesis of Compound 86 
     
       
         
         
             
             
         
       
     
     Compound 86 (1.4 g, yield: 47%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate D-4 (3.5 g, 1.97 mmol) and 2,2,6,6-tetramethylheptane-3,5-dione (3.6 g, 19.65 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1142.34 
     Synthesis Example 5: Synthesis of Compound 101 
     (1) Synthesis of Intermediate E-1 
     
       
         
         
             
             
         
       
     
     The Intermediate A-2 (50 g, 153.38 mmol) dissolved in THF/diethyl ether (1:1, 500 ml) was put into a reaction vessel, the temperature of the reaction vessel was cooled to −100° C., and then 2.5 M n-BuLi (153.38 mmol) was added slowly into the solution. After keeping the temperature for 30 minutes, N,N-dimethylformamide (207.4 g, 2.8 mol) was added slowly into the reaction vessel, and then the solution was stirred at −80° C. for 2 hours. HCl/EtOH (1:3, 500 ml) was added slowly into the solution to terminate the reaction, and then the reactants were put into HCl/EtOH (1:5, 2000 ml). An organic layer was extracted with diethyl ether, MgSO 4  was put into the organic layer, the organic layer was filtered, and then the filtrate was distilled under reduced pressure. A mixture was purified with column chromatography (eluent: hexane/CH 2 Cl 2 ) to give the Intermediate E-1 (19.4 g, yield: 46%). 
     MS (m/z): 273.96 
     (2) Synthesis of Intermediate E-2 
     
       
         
         
             
             
         
       
     
     The Intermediate E-2 (13.6 g, yield: 60%) was obtained with the same synthetic process of the Intermediate A-3, except that the Intermediate E-1 (19.4 g, 70.56 mmol) was used as a reactant instead of the Intermediate A-2 (40 g, 122.71 mmol). 
     MS (m/z): 322.14 
     (3) Synthesis of Intermediate E-3 
     
       
         
         
             
             
         
       
     
     The Intermediate E-3 (15.4 g, yield: 78%) was obtained with the same synthetic process of the Intermediate D-1, except that the Compound SM-7 (10.0 g, 61.12 mmol) and the Intermediate E-2 (21.7 g, 67.24 mmol) were used as reactants instead of the Compound SM-5 (10.0 g, 61.12 mmol) and the Compound SM-6 (22.7 g, 67.24 mmol). 
     MS (m/z): 323.09 
     (4) Synthesis of Intermediate E-4 
     
       
         
         
             
             
         
       
     
     The Intermediate E-3 (15.4 g, 47.63 mmol) dissolved in methanol (200 ml) was put into a reaction vessel, and then I 2  (12.1 g, 47.63 mmol) was added into the solution with stirring. After 12 was dissolved, NaNO 2  (3.3 g, 47.63 mmol) dissolved in H 2 O (50 ml) was added into the solution, then the solution was stirred at RT for 10 minutes. After stirring at 70° C. for 18 hours to complete the reaction, the temperature of the solution was cooled to RT and the solution was washed with 1M NaS 2 O 3 . An organic layer was extracted with CHCl 3 , water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate E-4 (16.3 g, yield: 97%). 
     MS (m/z): 353.11 
     (5) Synthesis of Intermediate E-5 
     
       
         
         
             
             
         
       
     
     The Intermediate E-4 (16.3 g, 46.13 mmol) dissolved in THE (500 ml) was put into a reaction vessel, CH 3 MgBr (27.5 g, 230.64 mmol) was added slowly into the solution, and then the solution was stirred for 12 hours. After the reaction was complete, an organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate E-5 (8.0 g, yield: 49%). 
     MS (m/z): 353.14 
     (6) Synthesis of Intermediate E-6 
     
       
         
         
             
             
         
       
     
     The Intermediate E-5 (8.0 g, 22.64 mmol) dissolved in a mixed aqueous solution (100 ml) of acetic acid and sulfuric acid put into a reaction vessel, and the solution was refluxed for 16 hours. After the reaction was complete, the temperature of the solution was cooled to RT, and then the reactants were added dropwise slowly into iced sodium hydroxide aqueous solution. An organic layer was extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was recrystallized with toluene and ethanol to give the Intermediate E-6 (3.6 g, yield: 48%). 
     MS (m/z): 335.13 
     (7) Synthesis of Intermediate E-7 
     
       
         
         
             
             
         
       
     
     The Intermediate E-7 (3.5 g, yield: 58%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate E-6 (5 g, 14.9 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (8) Synthesis of Compound 101 
     
       
         
         
             
             
         
       
     
     Compound 101 (2.0 g, yield: 50%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate E-7 (3.5 g, 1.97 mmol) and 2,2,6,6-tetramethylheptane-3,5-dione (3.6 g, 19.65 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1044.35 
     Synthesis Example 6: Synthesis of Compound 137 
     (1) Synthesis of Intermediate F-1 
     
       
         
         
             
             
         
       
     
     The Intermediate F-1 (13.0 g, yield: 65%) was obtained with the same synthetic process of the Intermediate D-1, except the Compound SM-5 (10.0 g, 61.12 mmol) and the Compound SM-8 (23.9 g, 73.35 mmol) were used as reactants instead of the Compound SM-5 (10.0 g, 61.12 mmol) and the Compound SM-6 (22.7 g, 67.24 mmol). 
     MS (m/z): 326.09 
     (2) Synthesis of Intermediate F-2 
     
       
         
         
             
             
         
       
     
     The Intermediate F-2 (5.2 g, yield: 40%) was obtained with the same synthetic process of the Intermediate D-2, except that the Intermediate F-1 (13.0 g, 39.73 mmol) was used as a reactant instead of the Intermediate D-1 (12.9 g, 41.56 mmol). 
     MS (m/z): 324.07 
     (3) Synthesis of Intermediate F-3 
     
       
         
         
             
             
         
       
     
     The Intermediate F-3 (5.0 g, yield: 79%) was obtained with the same synthetic process of the Intermediate D-3, except that the Intermediate F-2 (5.2 g, 15.89 mmol) was used as a reactant instead of the Intermediate D-2 (4.7 g, 15.38 mmol). 
     MS (m/z): 400.1 
     (4) Synthesis of Intermediate F-4 
     
       
         
         
             
             
         
       
     
     The Intermediate F-4 (3.0 g, yield: 52%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate F-3 (5 g, 12.48 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (5) Synthesis of Compound 137 
     
       
         
         
             
             
         
       
     
     Compound 137 (1.4, yield: 39%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate F-4 (3.0 g, 1.48 mmol) and 3,7-diethylnonane-4,6-dione (3.1 g, 14.75 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1202.32 
     Synthesis Example 7: Synthesis of Compound 479 
     
         
         
           
             (1) Synthesis of Intermediate G-1 
           
         
       
    
     
       
         
         
             
             
         
       
     
     Compound SM-9 (50.0 g, 153.38 mmol), methyl boronic acid (23.0 g, 383.46 mmol), Pd 2 (dba) 3  (4.2 g, 3 mol %), SPhos (2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl, 6.3 g, 15.34 mmol) and potassium phosphate monohydrate (176.6 g, 766.92 mmol) dissolved in toluene (1000 ml) were put into a reaction vessel, and then the solution was stirred at 120° C. for 12 hours. After the reaction was complete, the temperature of the solution was cooled to RT, an organic layer was extracted with ethyl acetate, and then the solvent was removed. A crude product was purified with column chromatography (eluent: ethyl acetate and hexane) to give the Intermediate G-1 (16.9 g, yield: 56%). 
     MS (m/z): 196.09 
     (2) Synthesis of Intermediate G-2 
     
       
         
         
             
             
         
       
     
     The Intermediate G-1 (16.9 g, 86.12 mmol) dissolved in DMF (300 ml) was put into a reaction vessel, NBS (33.7 g, 189.46 mmol) was added into the solution, and then the solution was stirred for 12 hours with blocking light. After the reaction was complete, water was added into the solution to produce a solid, and then the solid was filtered. The filtered solid was washed with water three times, and then recrystallized with toluene and ethanol to give the Intermediate G-2 (26.8 g, yield: 88%). 
     MS (m/z): 351.91 
     (3) Synthesis of Intermediate G-3 
     
       
         
         
             
             
         
       
     
     The Intermediate G-2 (20 g, 56.5 mmol), bis(pinacolato)diboron (16.1 g, 67.79 mmol), Pd(dppf)Cl 2  (2.1 g, 2.82 mmol), KOAc (17.1 g, 173.89 mmol) dissolved in 1,4-dioxane (300 ml) were put into a reaction vessel, and then the solution was stirred at 100° C. for 4 hours. The temperature of the reactants was cooled to RT, an organic layer were extracted with ethyl acetate, water in the organic layer was removed with MgSO 4 , and then the organic layer was filtered and treated under reduced pressure to remove the solvent. A crude product was purified with column chromatography (eluent: hexane and ethyl acetate) to give the Intermediate G-3 (17.2 g, yield: 76%). 
     MS (m/z): 400.08 
     (4) Synthesis of Intermediate G-4 
     
       
         
         
             
             
         
       
     
     The Intermediate G-4 (12.8 g, yield: 61%) was obtained with the same synthetic process of the Intermediate A-4, except that the Intermediate G-3 (25.1 g, 62.63 mmol) was used as a reactant instead of the Intermediate A-3 (23.4 g, 62.63 mmol). 
     MS (m/z): 349.11 
     (5) Synthesis of Intermediate G-5 
     
       
         
         
             
             
         
       
     
     The Intermediate G-5 (11.8 g, yield: 96%) was obtained with the same synthetic process of the Intermediate A-5, except that the Intermediate G-4 (12.8 g, 36.55 mmol) was used as a reactant instead of the Intermediate A-4 (10.6 g, 32.99 mmol). 
     MS (m/z): 335.13 
     (6) Synthesis of Intermediate G-6 
     
       
         
         
             
             
         
       
     
     The Intermediate G-6 (7.0 g, yield: 55%) was obtained with the same synthetic process of the Intermediate A-6, except that the Intermediate G-5 (11.8 g, 35.09 mmol) was used as a reactant instead of the Intermediate A-5 (9.1 g, 29.61 mmol). 
     MS (m/z): 363.16 
     (7) Synthesis of Intermediate G-7 
     
       
         
         
             
             
         
       
     
     The Intermediate G-7 was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate G-6 (5 g, 13.76 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (8) Synthesis of Compound 479 
     
       
         
         
             
             
         
       
     
     Compound 479 was obtained with the same synthetic process of Compound 1, except that the Intermediate G-7 (3.0 g, 1.59 mmol) and 3,7-diethylnonane-4,6-dione (3.4 g, 15.95 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1128.44 
     Synthesis Example 8: Synthesis of Compound 700 
     (1) Synthesis of Intermediate H-1 
     
       
         
         
             
             
         
       
     
     The Intermediate H-1 (24.0 g, yield: 62%) was obtained with the same synthetic process of the Intermediate G-1, except that propan-2-yl boronic acid (33.7 g, 383.46 mmol) was used as a reactant instead of methyl boronic acid (23.0 g, 383.46 mmol). 
     MS (m/z): 252.15 
     (2) Synthesis of Intermediate H-2 
     
       
         
         
             
             
         
       
     
     The Intermediate H-2 was obtained with the same synthetic process of the Intermediate G-2, except that the Intermediate H-1 (24.0 g, 95.10 mmol) was used as a reactant instead of the Intermediate G-1 (16.9 g, 86.12 mmol). 
     MS (m/z): 407.97 
     (3) Synthesis of Intermediate H-3 
     
       
         
         
             
             
         
       
     
     The Intermediate H-3 (13.2 g, yield: 41%) was obtained with the same synthetic process of the Intermediate E-1, except that the Intermediate H-2 (36.7 g, 89.39 mmol) was used as a reactant instead of the Intermediate A-2 (50 g, 153.38 mmol). 
     MS (m/z): 358.06 
     (3) Synthesis of Intermediate H-4 
     
       
         
         
             
             
         
       
     
     The Intermediate H-4 (8.0 g, yield: 54%) was obtained with the same synthetic process of the Intermediate A-3, except that the Intermediate H-3 (13.2 g, 36.65 mmol) was used as a reactant instead of the Intermediate A-2 (40 g, 122.71 mmol). 
     MS (m/z): 406.23 
     (5) Synthesis of Intermediate H-5 
     
       
         
         
             
             
         
       
     
     The Intermediate H-5 (18.3 g, yield: 77%) was obtained with the same synthetic process of the Intermediate E-3, except that the Compound SM-10 (10.0 g, 56.30 mmol) and the Intermediate H-4 (25.2 g, 61.93 mmol) were used as reactants instead of the Compound SM-7 (10.0 g, 61.12 mmol) and the Intermediate E-2 (21.7 g, 67.24 mmol). 
     MS (m/z): 421.2 
     (6) Synthesis of Intermediate H-6 
     
       
         
         
             
             
         
       
     
     The Intermediate H-6 (18.4 g, yield: 94%) was obtained with the same synthetic process of the Intermediate E-4, except that the Intermediate H-5 (18.3 g, 43.41 mmol) was used as a reactant instead of the Intermediate E-3 (15.4 g, 47.63 mmol). 
     MS (m/z): 451.21 
     (7) Synthesis of Intermediate H-7 
     
       
         
         
             
             
         
       
     
     The Intermediate H-7 (8.1 g, yield: 44%) was obtained with the same synthetic process of the Intermediate E-5, except that the Intermediate H-6 (18.4 g, 40.81 mmol) was used as a reactant instead of the Intermediate E-4 (16.3 g, 46.13 mmol). 
     MS (m/z): 451.25 
     (8) Synthesis of Intermediate H-8 
     
       
         
         
             
             
         
       
     
     The Intermediate H-8 (4.4 g, yield: 57%) was obtained with the same synthetic process of the Intermediate E-6, except that the Intermediate H-7 (8.1 g, 17.96 mmol) was used as a reactant instead of the Intermediate E-5 (8.0 g, 22.64 mmol). 
     MS (m/z): 433.24 
     (9) Synthesis of Intermediate H-9 
     
       
         
         
             
             
         
       
     
     The Intermediate H-9 (2.7 g, yield: 45%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate H-8 (5 g, 11.92 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (10) Synthesis of Compound 700 
     
       
         
         
             
             
         
       
     
     Compound 700 (1.5 g, yield: 49%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate H-9 (2.7 g, 1.22 mmol) and 3,7-diethylnonane-4,6-dione (2.6 g, 12.19 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1268.6 
     Synthesis Example 9: Synthesis of Compound 800 
     (1) Synthesis of Intermediate I-1 
     
       
         
         
             
             
         
       
     
     The Intermediate I-1 (12.1 g, yield: 66%) was obtained with the same synthetic process of the Intermediate E-3, except that the Compound SM-11 (10.0 g, 55.68 mmol) and the Compound SM-12 (20.9 g, 66.82 mmol) were used as reactants instead of the Compound SM-7 (10.0 g, 61.12 mmol) and the Intermediate E-2 (21.7 g, 67.24 mmol). 
     MS (m/z): 329.09 
     (2) Synthesis of Intermediate I-2 
     
       
         
         
             
             
         
       
     
     The Intermediate I-1 (12.1 g, 36.75 mmol) dissolved in DMF (100 ml) was put into a reaction vessel, K 2 CO 3  (15.0 g, 108.57 mmol) was added into the solution, and then the solution was stirred at 100° C. for 1 hour. After the reaction was complete, the temperature of the solution was cooled to RT, and then ethanol (100 ml) was added slowly into the solution. The mixture was distilled under reduced pressure and then was recrystallized with chloroform/ethyl acetate to give the Intermediate I-2 (5.5 g, yield: 48%). 
     MS (m/z): 309.08 
     (3) Synthesis of Intermediate I-3 
     
       
         
         
             
             
         
       
     
     The Intermediate I-3 (2.5 g, yield: 41%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate I-2 (5 g, 16.16 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (4) Synthesis of Compound 800 
     
       
         
         
             
             
         
       
     
     Compound 800 (1.1 g, yield: 42%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate I-3 (2.5 g, 1.51 mmol) was used as a reactant instead of the Intermediate A-7 (2.1 g, 1.2 mmol). 
     MS (m/z): 908.15 
     Synthesis Example 10: Synthesis of Compound 827 
     (1) Synthesis of Intermediate J-1 
     
       
         
         
             
             
         
       
     
     The Intermediate J-1 (12.5 g, yield: 65%) was obtained with the same synthetic process of the Intermediate E-3, except that the Compound SM-11 (10.0 g, 55.68 mmol) and the Compound SM-13 (21.4 g, 66.82 mmol) were used as reactants instead of the Compound SM-7 (10.0 g, 61.12 mmol) and the Intermediate E-2 (21.7 g, 67.24 mmol). 
     MS (m/z): 345.06 
     (2) Synthesis of Intermediate J-2 
     
       
         
         
             
             
         
       
     
     The Intermediate J-2 (6.0 g, yield: 51%) was obtained with the same synthetic process of the Intermediate I-2, except that the Intermediate J-1 (12.5 g, 36.19 mmol) was used as a reactant instead of the Intermediate I-1 (12.1 g, 36.75 mmol). 
     MS (m/z): 325.06 
     (3) Synthesis of Intermediate J-3 
     
       
         
         
             
             
         
       
     
     The Intermediate J-3 (3.2 g, yield: 52%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate J-2 (5 g, 15.17 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (4) Synthesis of Compound 827 
     
       
         
         
             
             
         
       
     
     Compound 827 (2.1 g, yield: 56%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate J-7 (3.2 g, 1.82 mmol) and 3,7-diethylnonane-4,6-dione (3.9 g, 18.16 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1052.23 
     Synthesis Example 11: Synthesis of Compound 839 
     (1) Synthesis of Intermediate K-1 
     
       
         
         
             
             
         
       
     
     The Intermediate K-1 (10.5 g, yield: 58%) was obtained with the same synthetic process of the Intermediate A-4, except that the Compound SM-14 (25.0 g, 62.63 mmol) was used as a reactant instead of the Intermediate A-3 (23.4 g, 62.63 mmol). 
     MS (m/z): 347.13 
     (2) Synthesis of Intermediate K-2 
     
       
         
         
             
             
         
       
     
     The Intermediate K-2 (9.6 g, yield: 95%) was obtained with the same synthetic process of the Intermediate A-5, except that the Intermediate K-1 (10.5 g, 30.27 mmol) was used as a reactant instead of the Intermediate A-4 (10.6 g, 32.99 mmol). 
     MS (m/z): 333.15 
     (3) Synthesis of Intermediate K-3 
     
       
         
         
             
             
         
       
     
     The Intermediate K-3 (5.4 g, yield: 52%) was obtained with the same synthetic process of the Intermediate A-6, except that the Intermediate K-2 (9.6 g, 28.76 mmol) was used as a reactant instead of the Intermediate A-5 (9.1 g, 29.61 mmol). 
     MS (m/z): 361.18 
     (4) Synthesis of Intermediate K-4 
     
       
         
         
             
             
         
       
     
     The Intermediate K-4 (3.2 g, yield: 53%) was obtained with the same synthetic process of the Intermediate A-7, except that the Intermediate K-3 (5 g, 13.83 mmol) was used as a reactant instead of the Intermediate A-6 (5 g, 14.9 mmol). 
     (5) Synthesis of Compound 839 
     
       
         
         
             
             
         
       
     
     Compound 839 (2.0 g, yield: 54%) was obtained with the same synthetic process of the Compound 1, except that the Intermediate K-4 (3.2 g, 1.67 mmol) and 3,7-diethylnonane-4,6-dione (3.5 g, 16.66 mmol) were used as reactants instead of the Intermediate A-7 (2.1 g, 1.2 mmol) and acetylacetone (1.2 g, 11.71 mmol). 
     MS (m/z): 1124.48 
     Example 1 (Ex. 1): Fabrication of OLED 
     An organic light emitting diode was fabricated by applying Compound 1 obtained in Synthesis Example 1 as dopant into an emitting material layer (EML). A glass substrate onto which ITO (100 nm) was coated as a thin film was washed and ultrasonically cleaned by solvent such as isopropyl alcohol, acetone and dried at 100° C. oven. The substrate was transferred to a vacuum chamber for depositing emissive layer. Subsequently, an emissive layer and a cathode were deposited by evaporation from a heating boat under about 5˜-7×10 −7  Torr with setting deposition rate of 1 A/s as the following order: 
     A hole injection layer (HIL) (following HI-1 (NPNPB), 60 nm); a hole transport layer (HTL) (following NPB, 80 nm); an EML (Host (CBP, 95 wt %), Dopant (Compound 1, 5 wt %), 30 nm); an ETL-EIL (following ET-1(2-[4-(9,10-Di-2-naphthalenyl-2-anthracenyl)phenyl]-1-phenyl-1H-benzimidazole, ZADN, 50 wt %), Liq (50 wt %), 30 nm); and a cathode (Al, 100 nm). 
     And then, capping layer (CPL) was deposited over the cathode and the device was encapsulated by glass. After deposition of emissive layer and the cathode, the OLED was transferred from the deposition chamber to a dry box for film formation, followed by encapsulation using UV-curable epoxy and moisture getter. The HIL material, the HTL material, the Host in the EMT and the ETT material is illustrated in the following 
     
       
         
         
             
             
         
       
     
     Examples 2-11 (Ex. 2-11): Fabrication of OLEDs 
     An OLED was fabricated using the same procedure and the same material as in Example 1, except that Compound 52 (Ex. 2), Compound 53 (Ex. 3), Compound 86 (Ex. 4), Compound 101 (Ex. 5), Compound 137 (Ex. 6), Compound 479 (Ex. 7), Compound 700 (Ex. 8), Compound 800 (Ex. 9), Compound 827 (Ex. 10) and Compound 839 (Ex. 11), respectively, was used as the dopant in the EML instead of Compound 1. 
     Comparative Example (Ref.): Fabrication of OLEDs 
     An OLED was fabricated using the same procedure and the same material as in Example 1, except the following Ref. Compound was used as the dopant in the EML instead of Compound 1. 
     [Ref. Compound] 
     
       
         
         
             
             
         
       
     
     Experimental Example 1: Measurement of Luminous Properties of OLEDs 
     Each of the OLEDs, having 9 mm 2  of emission area, fabricated in Examples 1 to 11 and Comparative Example was connected to an external power source and then luminous properties for all the OLEDs were evaluated using a constant current source (KEITHLEY) and a photometer PR650 at room temperature. In particular, driving voltage (V, relative value), External quantum efficiency (EQE, relative value) and time period (LT 95 , relative value) at which the luminance was reduced to 95% from initial luminance was measured at a current density 10 mA/cm 2 . The measurement results are indicated in the following Table 1. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Luminous Properties of OLED 
               
            
           
           
               
               
               
               
               
            
               
                   
                   
                 Driving  
                 EQE 
                 LT 95   
               
               
                   
                   
                 Voltage V (%,  
                 (%, relative 
                 (%, relative 
               
               
                 Sample 
                 Dopant 
                 relative value) 
                 value) 
                 value) 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Ref. 
                 Ref. 
                 100 
                 100 
                 100 
               
               
                   
                 Compound 
                   
                   
                   
               
               
                 Ex. 1 
                 1 
                 94.5 
                 111 
                 110 
               
               
                 Ex. 2 
                 52 
                 92.2 
                 105 
                 107 
               
               
                 Ex. 3 
                 53 
                 92.9 
                 102 
                 103 
               
               
                 Ex. 4 
                 86 
                 96.2 
                 107 
                 110 
               
               
                 Ex. 5 
                 101 
                 95.3 
                 113 
                 108 
               
               
                 Ex. 6 
                 137 
                 93.6 
                 106 
                 109 
               
               
                 Ex. 7 
                 479 
                 95.7 
                 122 
                 142 
               
               
                 Ex. 8 
                 700 
                 97.4 
                 108 
                 121 
               
               
                 Ex. 9 
                 800 
                 96.9 
                 106 
                 131 
               
               
                 Ex. 10 
                 827 
                 92.6 
                 105 
                 112 
               
               
                 Ex. 11 
                 839 
                 93.4 
                 120 
                 133 
               
               
                   
               
            
           
         
       
     
     As indicated in Table 1, compared to the OLED fabricated in Ref., the OLED fabricated in Ex. 1-11 where the EML includes the organic metal compound as the dopant lowered its driving voltage up to 7.8%, and improved its EQE and LT 95  up to 22% and 42%, respectively. Accordingly, when the organic metal compound of the present disclosure is applied into the EML, the OLED can lower its driving voltage and improved its luminous efficiency and luminous lifespan significantly. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the organic metal compound, the organic light emitting diode, and the organic light emitting device having the compound of the present disclosure without departing from the scope of the invention. Thus, it is intended that the present disclosure cover the modifications and variations of the present disclosure provided they come within the scope of the appended claims.