Patent Publication Number: US-2023157156-A1

Title: Organic electroluminescent compound and organic electroluminescent device comprising the same

Description:
TECHNICAL FIELD 
     The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. 
     BACKGROUND ART 
     An electroluminescent device (EL device) is a self-light-emitting display device which has advantages in that it provides a wider viewing angle, a greater contrast ratio, and a faster response time. The first organic EL device was developed by Eastman Kodak in 1987, by using small aromatic diamine molecules and aluminum complexes as materials for forming a light-emitting layer (see Appl. Phys. Lett. 51, 913, 1987). 
     An organic electroluminescent device (OLED) changes electric energy into light by applying electricity to an organic electroluminescent material, and commonly comprises an anode, a cathode, and an organic layer between the two electrodes. The organic layer of the OLED may comprise a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron blocking layer, a light-emitting layer, an electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc., if necessary. The materials used in the organic layer can be classified into a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material (including a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc., depending on their functions. In the OLED, holes from the anode and electrons from the cathode are injected into a light-emitting layer by the application of electric voltage, and excitons having high energy are produced by the recombination of the holes and electrons. The organic light-emitting compound moves into an excited state by the energy and emits light from the energy when the organic light-emitting compound returns to the ground state from the excited state. 
     The selection of the compound comprised in the hole transport layer, etc. has been recognized as a means for improving device properties such as hole transport efficiency to the light-emitting layer, luminous efficiency, and lifetime. Recently, the development of the organic electroluminescent device having high efficiency and long lifetime has emerged as an urgent task. In particular, the development of highly excellent material over conventional light-emitting materials is urgently required, considering the level of EL properties required for medium- and large-sized OLED panels. 
     Meanwhile, International Patent Publication No. 2019/235725 discloses a compound in which an amino group is attached to a naphthocarbazole derivative. In addition, Korean Patent Application Laid-Open No. 2012-0116881 discloses a compound in which two amino groups are attached to a naphthofluorene derivative. However, the aforementioned references do not specifically disclose that a compound in which one amino group is attached to naphthalene-fused fluoren can improve the performance of an organic electroluminescent device. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     The objective of the present disclosure is to provide an organic electroluminescent compound effective for producing an organic electroluminescent device having low driving voltage, high power efficiency, and/or improved lifetime properties. 
     Solution to Problem 
     The present inventors have found that the above objective can be achieved by an organic electroluminescent compound represented by the following formula 1. 
     
       
         
         
             
             
         
       
     
     In formula 1, 
     R′ 1  and R′ 2 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; or R′ 1  and R′ 2  may be linked to each other to form a ring(s), in which R′ 1  and R′ 2  may be the same as or different from each other; 
     R 1  to R 4 , each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), or -L 1 -N—(Ar 1 )(Ar 2 ); or may be linked to an adjacent substituent to form a ring(s); 
     with the proviso that any one of R 1 &#39;s to R 4 &#39;s represents -L 1 -N—(Ar 1 )(Ar 2 ); 
     L 1  represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene: 
     Ar 1  and Ar 2 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and 
     m and p, each independently, represent an integer of 4; n and o, each independently, represent an integer of 2; and each of R 1  to each of R 4  may be the same or different. 
     Advantageous Effects of Invention 
     The organic electroluminescent compound according to the present disclosure is possible to provide an organic electroluminescent device having low driving voltage, high power efficiency, and/or improved lifetime properties. 
    
    
     MODE FOR THE INVENTION 
     Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the disclosure, and is not meant in any way to restrict the scope of the disclosure. 
     The term “an organic electroluminescent compound” in the present disclosure means a compound that may be used in an organic electroluminescent device. If necessary, the organic electroluminescent compound may be comprised in any layers constituting an organic electroluminescent device. 
     The term “an organic electroluminescent material” in the present disclosure means a material that may be used in an organic electroluminescent device, and may comprise at least one compound. If necessary, the organic electroluminescent material may be comprised in any layers constituting an organic electroluminescent device. For example, the organic electroluminescent material may be a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material (including a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc. 
     Herein, the term “(C1-C30)alkyl” is meant to be a linear or branched alkyl having 1 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 1 to 10, and more preferably 1 to 6. The above alkyl may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc. The term “(C3-C30)cycloalkyl” is meant to be a mono- or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, in which the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7. The above cycloalkyl may include cyclopropyl, cyclobutyl, cydopentyl, cyclohexyl, cydopentylmethyl, cyclohexylmethyl, etc. The term “(3- to 7-membered)heterocycloalkyl” is meant to be a cycloalkyl having 3 to 7 ring backbone atoms, and including at least one heteroatom selected from the group consisting of B, N, O, S, Si, P, Te, and Se, and preferably the group consisting of O, S, N, Te, and Se. The above heterocydoalkyl may include tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, etc. The term “(C6-C30)aryl” or “(C6-C30)arylene” is meant to be a monocyclic or fused ring radical derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms. The above aryl(ene) may be partially saturated, and may comprise a spiro structure. The above aryl may include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenyinaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, diphenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, benzophenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, spiro[fluorene-benzofluoren]yl, spiro[cyclopenten-fluoren]yl, spiro[dihydroinden-fluoren]yl, azulenyl, tetramethyldihydrophenanthrenyl, etc. Specifically, the aryl may include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthacenyl, pyrenyl, 1-chrysenyl, 2-chrysenyl, 3-chrysenyl, 4-chrysenyl, 5-chrysenyl, 6-chrysenyl, benzo[c]phenanthryl, benzo[g]chrysenyl, 1-triphenylenyl, 2-triphenylenyl, 3-triphenylenyl, 4-triphenylenyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, benzo[a]fluorenyl, benzo[b]fluorenyl, benzo[c]fluorenyl, dibenzofluorenyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, o-terphenyl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-quaterphenyl, 3-fluoranthenyl, 4-fluoranthenyl, 8-fluoranthenyl, 9-fluoranthenyl, benzofluoranthenyl, o-tolyl, m-tolyl, p-tolyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl, o-cumenyl, m-cumenyl, p-cumenyl, p-tert-butylphenyl, p-(2-phenylpropyl)phenyl, 4′-methylbiphenyl, 4″-tert-butyl-p-terphenyl-4-yl, 9,9-dimethyl-1-fluorenyl, 9,9-dimethyl-2-fluorenyl, 9,9-dimethyl-3-fluorenyl, 9,9-dimethyl-4-fluorenyl, 9,9-diphenyl-1-fluorenyl, 9,9-diphenyl-2-fluorenyl, 9,9-diphenyl-3-fluorenyl, 9,9-diphenyl-4-fluorenyl, 11,11-dimethyl-1-benzo[a]fluorenyl, 11,11-dimethyl-2-benzo[a]fluorenyl, 11,11-dimethyl-3-benzo[a]fluorenyl, 11,11-dimethyl-4-benzo[a]fluorenyl, 11,11-dimethyl-5-benzo[a]fluorenyl, 11,11-dimethyl-6-benzo[a]fluorenyl, 11,11-dimethyl-7-benzo[a]fluorenyl, 11,11-dimethyl-8-benzo[a]fluorenyl, 11,11-dimethyl-9-benzo[a]fluorenyl, 11,11-dimethyl-10-benzo[a]fluorenyl, 11,11-dimethyl-1-benzo[b]fluorenyl, 11,11-dimethyl-2-benzo[b]fluorenyl, 11,11-dimethyl-3-benzo[b]fluorenyl, 11,11-dimethyl-4-benzo[b]fluorenyl, 11,11-dimethyl-5-benzo[b]fluorenyl, 11,11-dimethyl-6-benzo[b]fluorenyl, 11,11-dimethyl-7-benzo[b]fluorenyl, 11,11-dimethyl-8-benzo[b]fluorenyl, 11,11-dimethyl-9-benzo[b]fluorenyl, 11,11-dimethyl-10-benzo[b]fluorenyl, 11,11-dimethyl-1-benzo[c]fluorenyl, 11,11-dimethyl-2-benzo[c]fluorenyl, 11,11-dimethyl-3-benzo[c]fluorenyl, 11,11-dimethyl-4-benzo[c]fluorenyl, 11,11-dimethyl-5-benzo[c]fluorenyl, 11,11-dimethyl-6-benzo[c]fluorenyl, 11,11-dimethyl-7-benzo[c]fluorenyl, 11,11-dimethyl-8-benzo[c]fluorenyl, 11,11-dimethyl-9-benzo[c]fluorenyl, 11,11-dimethyl-10-benzo[c]fluorenyl, 11,11-diphenyl-1-benzo[a]fluorenyl, 11,11-diphenyl-2-benzo[a]fluorenyl, 11,11-diphenyl-3-benzo[a]fluorenyl, 11,11-diphenyl-4-benzo[a]fluorenyl, 11,11-diphenyl-5-benzo[a]fluorenyl, 11,11-diphenyl-6-benzo[a]fluorenyl, 11,11-diphenyl-7-benzo[a]fluorenyl, 11,11-diphenyl-8-benzo[a]fluorenyl, 11,11-diphenyl-9-benzo[a]fluorenyl, 11,11-diphenyl-10-benzo[a]fluorenyl, 11,11-diphenyl-1-benzo[b]fluorenyl, 11,11-diphenyl-2-benzo[b]fluorenyl, 11,11-diphenyl-3-benzo[b]fluorenyl, 11,11-diphenyl-4-benzo[b]fluorenyl, 11,11-diphenyl-5-benzo[b]fluorenyl, 11,11-diphenyl-6-benzo[b]fluorenyl, 11,11-diphenyl-7-benzo[b]fluorenyl, 11,11-diphenyl-8-benzo[b]fluorenyl, 11,11-diphenyl-9-benzo[b]fluorenyl, 11,11-diphenyl-10-benzo[b]fluorenyl, 11,11-diphenyl-1-benzo[c]fluorenyl, 11,11-diphenyl-2-benzo[c]fluorenyl, 11,11-diphenyl-3-benzo[c]fluorenyl, 11,11-diphenyl-4-benzo[c]fluorenyl, 11,11-diphenyl-5-benzo[c]fluorenyl, 11,11-diphenyl-6-benzo[c]fluorenyl, 11,11-diphenyl-7-benzo[c]fluorenyl, 11,11-diphenyl-8-benzo[c]fluorenyl, 11,11-diphenyl-9-benzo[c]fluorenyl, 11,11-diphenyl-10-benzo[c]fluorenyl, 9,9,10,10-tetramethyl-9,10-dihydro-1-phenanthrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-2-phenanthrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-3-phenanthrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-4-phenanthrenyl, etc. 
     The term “(3- to 30-membered)heteroaryl” or “(3- to 30-membered)heteroarylene” in the present disclosure is meant to be an aryl(ene) having 3 to 30 ring backbone atoms and including at least one heteroatom(s) selected from the group consisting of B, N, O, S, Si, P, Te, and Se. The number of heteroatoms is preferably 1 to 4. The above heteroaryl(ene) may be a monocyclic ring or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl(ene) group via a single bond(s); and may comprise a spiro structure. The above heteroaryl may include a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc., and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, dibenzoselenophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, benzofuroquinolyl, benzofuroquinazolinyl, benzofuronaphthyridinyl, benzofuropyrimidinyl, naphthofuropyrimidinyl, benzothienoquinolyl, benzothienoquinazolinyl, naphthyridinyl, benzothienonaphthyridinyl, benzothienopyrimidinyl, naphthothienopyrimidinyl, pyrimidoindolyl, benzopyrimidoindolyl, benzofuropyrazinyl, naphthofuropyrazinyl, benzothienopyrazinyl, naphthothienopyrazinyl, pyrazinoindolyl, benzopyrazinoindolyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenanthridinyl, benzodioxolyl, dihydroacridinyl, benzotriazolyl, phenazinyl, imidazopyridyl, chromenoquinazolinyl, thiochromenoquinazolinyl, dimethylbenzoperimidinyl, indolocarbazolyl, indenocarbazolyl, etc. More specifically, the heteroaryl may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazin-4-yl, 1,2,4-triazin-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5-indolidinyl, 6-indolidinyl, 7-indolidinyl, 8-indolidinyl, 2-imidazopyridyl, 3-imidazopyridyl, 5-imidazopyridyl, 6-imidazopyridyl, 7-imidazopyridyl, 8-imidazopyridyl, 3-pyridyl, 4-pyridyl, 1-indolyl, 2-indolyl, 3-indolyl, 4-indolyl, 5-indolyl, 6-indolyl, 7-indolyl, 1-isoindolyl, 2-isoindolyl, 3-isoindolyl, 4-isoindolyl, 5-isoindolyl, 6-isoindolyl, 7-isoindolyl, 2-furyl, 3-furyl, 2-benzofuranyl, 3-benzofuranyl, 4-benzofuranyl, 5-benzofuranyl, 6-benzofuranyl, 7-benzofuranyl, 1-isobenzofuranyl, 3-isobenzofuranyl, 4-isobenzofuranyl, 5-isobenzofuranyl, 6-isobenzofuranyl, 7-isobenzofuranyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 6-quinolyl, 7-quinolyl, 8-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl, 6-isoquinolyl, 7-isoquinolyl, 8-isoquinolyl, 2-quinoxalinyl, 5-quinoxalinyl, 6-quinoxalinyl, 1-carbazolyl, 2-carbazolyl, 3-carbazolyl, 4-carbazolyl, 9-carbazolyl, azacarbazolyl-1-yl, azacarbazolyl-2-yl, azacarbazolyl-3-yl, azacarbazolyl-4-yl, azacarbazolyl-5-yl, azacarbazolyl-6-yl, azacarbazolyl-7-yl, azacarbazolyl-8-yl, azacarbazolyl-9-yl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinyl, 2-acridinyl, 3-acridinyl, 4-acridinyl, 9-acridinyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 3-furazanyl, 2-thienyl, 3-thienyl, 2-methylpyrrol-1-yl, 2-methylpyrrol-3-yl, 2-methylpyrrol-4-yl, 2-methylpyrrol-5-yl, 3-methylpyrrol-1-yl, 3-methylpyrrol-2-yl, 3-methylpyrrol-4-yl, 3-methylpyrrol-5-yl, 2-tert-butylpyrrol-4-yl, 3-(2-phenylpropyl)pyrrol-1-yl, 2-methyl-1-indolyl, 4-methyl-1-indolyl, 2-methyl-3-indolyl, 4-methyl-3-indolyl, 2-tert-butyl-1-indolyl, 4-tert-butyl-1-indolyl, 2-tert-butyl-3-indolyl, 4-tert-butyl-3-indolyl, 1-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzofuranyl, 1-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho-[1,2-b]-benzofuranyl, 2-naphtho-[1,2-b]-benzofuranyl, 3-naphtho-[1,2-b]-benzofuranyl, 4-naphtho-[1,2-b]-benzofuranyl, 5-naphtho-[1,2-b]-benzofuranyl, 6-naphtho-[1,2-b]-benzofuranyl, 7-naphtho-[1,2-b]-benzofuranyl, 8-naphtho-[1,2-b]-benzofuranyl, 9-naphtho-[1,2-b]-benzofuranyl, 10-naphtho-[1,2-b]-benzofuranyl, 1-naphtho-[2,3-b]-benzofuranyl, 2-naphtho-[2,3-b]-benzofuranyl, 3-naphtho-[2,3-b]-benzofuranyl, 4-naphtho-[2,3-b]-benzofuranyl, 5-naphtho-[2,3-b]-benzofuranyl, 6-naphtho-[2,3-b]-benzofuranyl, 7-naphtho-[2,3-b]-benzofuranyl, 8-naphtho-[2,3-b]-benzofuranyl, 9-naphtho-[2,3-b]-benzofuranyl, 10-naphtho-[2,3-b]-benzofuranyl, 1-naphtho-[2,1-b]-benzofuranyl, 2-naphtho-[2,1-b]-benzofuranyl, 3-naphtho-[2,1-b]-benzofuranyl, 4-naphtho-[2,1-b]-benzofuranyl, 5-naphtho-[2,1-b]-benzofuranyl, 6-naphtho-[2,1-b]-benzofuranyl, 7-naphtho-[2,1-b]-benzofuranyl, 8-naphtho-[2,1-b]-benzofuranyl, 9-naphtho-[2,1-b]-benzofuranyl, 10-naphtho-[2,1-b]-benzofuranyl, 1-naphtho-[1,2-b]-benzothiophenyl, 2-naphtho-[1,2-b]-benzothiophenyl, 3-naphtho-[1,2-b]-benzothiophenyl, 4-naphtho-[1,2-b]-benzothiophenyl, 5-naphtho-[1,2-b]-benzothiophenyl, 6-naphtho-[1,2-b]-benzothiophenyl, 7-naphtho-[1,2-b]-benzothiophenyl, 8-naphtho-[1,2-b]-benzothiophenyl, 9-naphtho-[1,2-b]-benzothiophenyl, 10-naphtho-[1,2-b]-benzothiophenyl, 1-naphtho-[2,3-b]-benzothiophenyl, 2-naphtho-[2,3-b]-benzothiophenyl, 3-naphtho-[2,3-b]-benzothiophenyl, 4-naphtho-[2,3-b]-benzothiophenyl, 5-naphtho-[2,3-b]-benzothiophenyl, 1-naphtho-[2,1-b]-benzothiophenyl, 2-naphtho-[2,1-b]-benzothiophenyl, 3-naphtho-[2,1-b]-benzothiophenyl, 4-naphtho-[2,1-b]-benzothiophenyl, 5-naphtho-[2,1-b]-benzothiophenyl, 6-naphtho-[2,1-b]-benzothiophenyl, 7-naphtho-[2,1-b]-benzothiophenyl, 8-naphtho-[2,1-b]-benzothiophenyl, 9-naphtho-[2,1-b]-benzothiophenyl, 10-naphtho-[2,1-b]-benzothiophenyl, 2-benzofuro[3,2-d]pyrmidinyl, 6-benzofuro[3,2-d]pyrmidinyl, 7-benzofuro[3,2-d]pyrmidinyl, 8-benzofuro[3,2-d]pyrmidinyl, 9-benzofuro[3,2-d]pyrmidinyl, 2-benzothio[3,2-d]pyrimidinyl, 6-benzothio[3,2-d]pyrmidinyl, 7-benzothio[3,2-d]pyrimidinyl, 8-benzothio[3,2-d]pyrimidinyl, 9-benzothio[3,2-d]pyrmidinyl, 2-benzofuro[3,2-d]pyrazinyl, 6-benzofuro[3,2-d]pyrazinyl, 7-benzofuro[3,2-d]pyrazinyl, 8-benzofuro[3,2-d]pyrazinyl, 9-benzofuro[3,2-d]pyrazinyl, 2-benzothio[3,2-d]pyrazinyl, 6-benzothio[3,2-d]pyrazinyl, 7-benzothio[3,2-d]pyrazinyl, 8-benzothio[3,2-d]pyrazinyl, 9-benzothio[3,2-d]pyrazinyl, 1-silafluorenyl, 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germafluorenyl, 2-germafluorenyl, 3-germafluorenyl, 4-germafluorenyl, 1-dibenzoselenophenyl, 2-dibenzoselenophenyl, 3-dibenzoselenophenyl, 4-dibenzoselenophenyl, etc. In the present disclosure, the term “halogen” includes F, Cl, Br, and I. 
     In addition, “ortho (o-),” “meta (m-),” and “para (p-)” are prefixes, which represent the relative positions of substituents respectively. Ortho indicates that two substituents are adjacent to each other, and for example, when two substituents in a benzene derivative occupy positions 1 and 2, it is called an ortho position. Meta indicates that two substituents are at positions 1 and 3, and for example, when two substituents in a benzene derivative occupy positions 1 and 3, it is called a meta position. Para indicates that two substituents are at positions 1 and 4, and for example, when two substituents in a benzene derivative occupy positions 1 and 4, it is called a para position. 
     Herein, “substituted” in the expression “substituted or unsubstituted” means that a hydrogen atom in a certain functional group is replaced with another atom or another functional group, i.e., a substituent, and also includes that the hydrogen atom is replaced with a group formed by a linkage of two or more substituents of the above substituents. For example, the “group formed by a linkage of two or more substituents” may be pyridine-triazine. That is, pyridine-triazine may be interpreted as a heteroaryl substituent, or as substituents in which two heteroaryl substituents are linked. Herein, the substituent(s) of the substituted alkyl, the substituted alkenyl, the substituted alkynyl, the substituted aryl, the substituted arylene, the substituted heteroaryl, the substituted heteroarylene, the substituted cycloalkyl, the substituted alkoxy, the substituted trialkylsilyl, the substituted dialkylarylsilyl, the substituted alkyldiarylsilyl, the substituted triarylsilyl, the substituted fused ring group of an aliphatic ring(s) and an aromatic ring(s), the substituted alkylarylamino, the substituted mono- or di-alkylamino, the substituted mono- or di-arylamino, the substituted mono- or di-heteroarylamino, and the substituted arylheteroarylamino, each independently, are at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; a phosphineoxide; a (C1-C30)alkyl; a halo(C1-C30)alkyl; a (C2-C30)alkenyl unsubstituted or substituted with a (C6-C30)aryl(s); a (C2-C30)alkynyl; a (C1-C30)alkoxy; a (C1-C30)alkylthio; a (C3-C30)cycloalkyl; a (C3-C30)cycloalkenyl; a (3- to 7-membered)heterocycloalkyl; a (C6-C30)aryloxy; a (C6-C30)arylthio; a (3- to 30-membered)heteroaryl unsubstituted or substituted with at least one of deuterium and a (C6-C30)aryl(s); a (C6-C30)aryl unsubstituted or substituted with at least one of deuterium, a halogen(s), a cyano(s), a (C1-C30)alkyl(s), a (C6-C30)aryl(s), (3- to 30-membered)heteroaryl(s), a tri(C6-C30)arylsilyl(s), and a tri(C6-C30)arylgermanyl(s); a tri(C1-C30)alkylsilyl; a tri(C6-C30)arylsilyl; a di(C1-C30)alkyl(C6-C30)arylsilyl; a (C1-C30)alkyldi(C6-C30)arylsilyl; a tri(C1-C30)alkylgermanyl; a tri(C6-C30)arylgermanyl; a di(C1-C30)alkyl(C6-C30)arylgermanyl; a (C1-C30)alkyldi(C6-C30)arylgermanyl; a fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s); an amino; a mono- or di-(C1-C30)alkylamino; a mono- or di-(C2-C30)alkenylamino; a mono- or di-(C6-C30)arylamino unsubstituted or substituted with a (C1-C30)alkyl(s); a mono- or di-(3- to 30-membered)heteroarylamino; a (C1-C30)alkyl(C2-C30)alkenylamino; a (C1-C30)alkyl(C6-C30)arylamino; a (C1-C30)alkyl(3- to 30-membered)heteroarylamino; a (C2-C30)alkenyl(C6-C30)arylamino; a (C2-C30)alkenyl(3- to 30-membered)heteroarylamino; a (C6-C30)aryl(3- to 30-membered)heteroarylamino; a (C1-C30)alkylcarbonyl; a (C1-C30)alkoxycarbonyl; a (C6-C30)arylcarbonyl; a (C6-C30)arylphosphinyl; a di(C6-C30)arylboronyl; a di(C1-C30)alkylboronyl; a (C1-C30)alkyl(C6-C30)arylboronyl; a (C6-C30)aryl(C1-C30)alkyl; and a (C1-C30)alkyl(C6-C30)aryl, or the combination thereof. According to one embodiment of the present disclosure, the substituent(s), each independently, are at least one selected from the group consisting of deuterium; a halogen; a cyano; a (C1-C20)alkyl; a (C2-C20)alkenyl unsubstituted or substituted with a (C6-C25)aryl(s); a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a halogen(s), a cyano(s), a (C1-C20)alkyl(s), a (C6-C25)aryl(s), a (5- to 20-membered)heteroaryl(s), a tri(C6-C18)arylsilyl(s), and a tri(C6-C18)arylgermanyl(s); a (5- to 25-membered)heteroaryl unsubstituted or substituted with at least one of deuterium and a (C6-C25)aryl(s); a tri(C6-C18)arylsilyl; a tri(C6-C18)arylgermanyl; and a (C6-C25)aryl(C1-C20)alkyl. According to another embodiment of the present disclosure, the substituent(s), each independently, are at least one selected from the group consisting of deuterium; a cyano; a (C1-C10)alkyl; a (C2-C10)alkenyl unsubstituted or substituted with a (C6-C18)aryl(s); a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a halogen(s), a cyano(s), a (C1-C10)alkyl(s), a (C6-C18)aryl(s), (5- to 20-membered)heteroaryl(s), a tri(C6-C18)arylsilyl(s), and a tri(C6-C18)arylgermanyl(s); a (5- to 20-membered)heteroaryl unsubstituted or substituted with at least one of deuterium and a (C6-C18)aryl(s); a tri(C6-C18)arylsilyl; a tri(C6-C18)arylgermanyl; and a (C6-C18)aryl(C1-C10)alkyl. For example, the substituent(s), each independently, may be any one selected from the group consisting of deuterium, a cyano, a methyl, a tert-butyl, a ethylene substituted with a phenyl(s), a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a biphenyl; a phenanthrenyl, a terphenyl, a chrysenyl, a benzo[c]phenanthryl, a triphenylenyl, a dimethylfluorenyl, a diphenylfluorenyl, a dimethylbenzofluorenyl, a spirobifluorenyl, a pyridyl, a pyrimidinyl, a triazinyl substituted with a phenyl(s), an indolyl, a dibenzofuranyl unsubstituted or substituted with at least one of deuterium and a phenyl(s), a dibenzothiophenyl, a carbazolyl unsubstituted or substituted with at least one of a phenyl(s) and a biphenyl(s), a phenylpropyl, a dibenzotelluriumyl, a dibenzoselenophenyl, a benzonaphthofuranyl, a benzonaphthothiophenyl, a phenanthrooxazolyl substituted with a phenyl(s), a triphenylsilyl, and a triphenylgermanyl, or the combination thereof. The substituent(s) of the substituted phenyl may be at least one selected from the group consisting of deuterium, a cyano, a fluoro, a methyl, a naphthyl, a carbazolyl, a triphenylsilyl, a triphenylgermanyl, and a dibenzotellurumyl. The substituent(s) of the substituted naphthyl may be at least one selected from the group consisting of a phenyl, a biphenyl, and a chrysenyl. 
     Herein, a ring formed by a linkage of adjacent substituents means that at least two adjacent substituents are linked to or fused with each other to form a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof. Preferably, the ring may be a substituted or unsubstituted, mono- or polycyclic, (3- to 26-membered) alicyclic or aromatic ring, or the combination thereof. More preferably, the ring may be a mono- or polycyclic, (5- to 25-membered) aromatic ring unsubstituted or substituted with at least one of a (C1-C6)alkyl(s), a (C6-C18)aryl(s) and a (3- to 20-membered)heteroaryl(s). In addition, the formed ring may contain at least one heteroatom selected from B, N, O, S, Si, P, Te, and Se, and preferably at least one heteroatom selected from N, O, S, Te, and Se. For example, the ring may be a benzene ring, a cyclopentane ring, an indene ring, an indane ring, a fluorene ring, a phenanthrene ring, an indole ring, a benzofuran ring unsubstituted or substituted with a phenyl(s), a benzothiophene ring unsubstituted or substituted with a phenyl(s), a xanthene ring, etc. The ring may also form a spiro ring(s). 
     Herein, heteroaryl, heteroarylene, and heterocycloalkyl, each independently, may contain at least one heteroatom selected from the group consisting of B, N, O, S, Si, P, Te, and Se. In addition, the heteroatom may be bonded to at least one selected from the group consisting of hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C2-C30)alkenylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, a substituted or unsubstituted mono- or di-(3- to 30-membered)heteroarylamino, a substituted or unsubstituted (C1-C30)alkyl(C2-C30)alkenylamino, a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, a substituted or unsubstituted (C1-C30)alkyl(3- to 30-membered)heteroarylamino, a substituted or unsubstituted (C2-C30)alkenyl(C6-C30)arylamino, a substituted or unsubstituted (C2-C30)alkenyl(3- to 30-membered)heteroarylamino, and a substituted or unsubstituted (C6-C30)aryl(3- to 30-membered)heteroarylamino. 
     In formula 1, R′ 1  and R′ 2 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; or R′ 1  and R′ 2  may be linked to each other to form a ring(s). R′ 1  and R′ 2  may be the same as or different from each other. According to one embodiment of the present disclosure, R′ 1  and R′ 2 , each independently, represent a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl; or R′ 1  and R′ 2  may be linked to each other to form a ring(s). According to another embodiment of the present disclosure, R′ 1  and R′ 2 , each independently, represent an unsubstituted (C1-C10)alkyl, an unsubstituted (C6-C18)aryl, or an unsubstituted (5- to 20-membered)heteroaryl; or R′ 1  and R′ 2  may be linked to each other to form a spiro ring. For example, R′ 1  and R′ 2 , each independently, represent a methyl, an ethyl, a propyl, a phenyl, a naphthyl, a pyridyl, etc.; or R′ 1  and R′ 2  may be linked to each other to form a spirofluorene ring or a spiroindane ring, etc. 
     In formula 1, m and p, each independently, represent an integer of 4; n and o, each independently, represent an integer of 2; and each of R 1  to each of R 4  may be the same or different. 
     In formula 1, R 1  to R 4 , each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), or -L 1 -N—(Ar 1 )(Ar 2 ); or may be linked to an adjacent substituent to form a ring(s); with the proviso that any one of R 1 &#39;s to R 4 &#39;s represents -L 1 -N—(Ar 1 )(Ar 2 ). According to one embodiment of the present disclosure, R 1  to R 4 , each independently, represent hydrogen, or -L 1 -N—(Ar 1 )(Ar 2 ). 
     L 1  represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene. According to one embodiment of the present disclosure, L 1  represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (5- to 25-membered)heteroarylene. According to another embodiment of the present disclosure, L 1  represents a single bond, a (C6-C18)arylene unsubstituted or substituted with a (C6-C18)aryl(s), or an unsubstituted (5- to 20-membered)heteroarylene. For example, L 1  may be a single bond, a phenylene unsubstituted or substituted with a phenyl(s), a naphthylene, a biphenylene, a dibenzothiophenylene, a dibenzofuranylene, etc. 
     Ar 1  and Ar 2 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl. Ar 1  and Ar 2  may be the same or different. According to one embodiment of the present disclosure, Ar 1  and Ar 2 , each independently, represent a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl. According to another embodiment of the present disclosure, Ar 1  and Ar 2 , each independently, represent a substituted or unsubstituted (C6-C24)aryl, or a (5- to 20-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s). The substituent(s) of the substituted aryl may be any one selected from the group consisting of a (C1-C10)alkyl, a (C2-C10)alkenyl, a (C6-C18)aryl, a (5- to 15-membered)heteroaryl, and a (C6-C18)aryl(C1-C10)alkyl; or the combination thereof. For example, Ar 1  and Ar 2 , each independently, may be a substituted or unsubstituted phenyl, a naphthyl, a phenylnaphthyl, a naphthylphenyl, a biphenyl, a phenanthrenyl, a terphenyl, a quaterphenyl, a triphenylenyl, a chrysenyl, a dimethylfluorenyl, a diphenylfluorenyl, a benzofuranyl, a benzothiophenyl, a dibenzofuranyl unsubstituted or substituted with a phenyl(s), a dibenzothiophenyl unsubstituted or substituted with a phenyl(s), a dibenzoselenophenyl unsubstituted or substituted with a phenyl(s), a phenylcarbazolyl, a phenoxazinyl substituted with a phenyl(s), etc. The substituent(s) of the phenyl may be at least one selected from the group consisting of a methyl, a tert-butyl, a triphenylethylenyl, a dimethylfluorenyl, a dibenzofuranyl, a dibenzothiophenyl, an indolyl, a pyridyl, a pyrimidinyl, a carbazolyl, and a phenylpropyl, etc. 
     The formula 1 may be represented by the following formula 1-1. 
     
       
         
         
             
             
         
       
     
     In formula 1-1, R′ 1 , R′ 2 , R 1  to R 4 , and m to p are as defined in formula 1 above. 
     The formula 1 may be represented by any one of the following formulas 1-1-1 to 1-1-4. 
     
       
         
         
             
             
         
       
     
     In formulas 1-1-1 to 1-1-4, R′ 1 , R′ 2 , L 1 , Ar 1 , Ar 2 , and m to p are as defined in formula 1 above. 
     In formulas 1-1-1 to 1-14, m′ and p′, each independently, represent an integer of 3; and n′ and o′, each independently, represent an integer of 1. 
     In formulas 1-1-1 to 1-14, R 1  to R 4 , each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s); or may be linked to an adjacent substituent to form a ring(s). For example, R 1  to R 4  may be hydrogen. 
     The formula 1 may be represented by any one of the following formulas 1-1-1-1 to 1-1-1-12. 
     
       
         
         
             
             
         
       
     
     In formulas 1-1-1-1 to 1-1-1-12, R′ 1 , R′ 2 , L 1 , Ar 1 , Ar 2 , and m to p are as defined in formula 1 above. 
     In formulas 1-1-1-1 to 1-1-1-12, m′ and p′, each independently, represent an integer of 3; and n′ and o′, each independently, represent an integer of 1. 
     In formulas 1-1-1-1 to 1-1-1-12, R 1  to R 4 , each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s); or may be linked to an adjacent substituent to form a ring(s). For example, R 1  to R 4  may be hydrogen. 
     The compound represented by formula 1 may be at least one selected from the group consisting of the following compounds, but is not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The organic electroluminescent compound of the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, by referring to the following reaction schemes 1 to 4, but is not limited thereto. 
     
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     In reaction schemes 1 to 4, R′ 1 , R′ 2 , L 1 , Ar 1 , and Ar 2  are as defined in formula 1. 
     Although illustrative synthesis examples of the compound represented by formula 1 are described above, one skilled in the art will be able to readily understand that all of them are based on a Buchwald-Hartwig cross-coupling reaction, an N-arylation reaction, a H-mont-mediated etherification reaction, a Miyaura borylation reaction, a Suzuki cross-coupling reaction, an Intramolecular acid-induced cyclization reaction, a Pd(II)-catalyzed oxidative cyclization reaction, a Grignard reaction, a Heck reaction, a Cyclic Dehydration reaction, an SN 1  substitution reaction, an SN 2  substitution reaction, and a Phosphine-mediated reductive cyclization reaction, etc., and the reactions above proceed even when substituents which are defined in formula 1 above, but are not specified in the specific synthesis examples, are bonded. 
     A host compound, which can be used in combination with the compound of the present disclosure, includes a compound represented by any one of the following formulas 11 to 15, but is not limited thereto. 
     
       
         
         
             
             
         
       
     
     In formulas 11 to 15, 
     Ma represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, a substituted or unsubstituted mono- or di-(3- to 30-membered)heteroarylamino, a substituted or unsubstituted (C6-C30)aryl(3- to 30-membered)heteroarylamino, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; 
     La represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; 
     A represents S, O, N(Re), C(Rf)(Rg), Te, or Se; 
     ring B represents a naphthalene ring or a phenanthrene ring; 
     Ra to Rd, and Rh to Rk, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, or a substituted or unsubstituted mono- or di-(C6-C30)arylamino; or may be linked to an adjacent substituent to form a ring(s); 
     Re to Rg, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; and Rf and Rg may be linked to each other to form a ring(s); 
     w to y, q, and r, each independently, represent an integer of 1 to 4; z represents an integer of 1 to 3; and a and t, each independently, represent an integer of 1 or 2; n represents an integer of 1 to 9; and each of Ra to each of Rd, each of Ri to each of Rk, and each of La may be the same or different; and 
     the heteroaryl(ene) comprises at least one heteroatom selected from the group consisting of B, N, O, S, Si, P, Te, and Se. 
     According to one embodiment, Ma represents a substituted or unsubstituted phenyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted benzoquinazolinyl, a substituted or unsubstituted benzoquinoxalinyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, a substituted or unsubstituted dibenzotellurumyl, a substituted or unsubstituted benzofuranopyrimidinyl, a substituted or unsubstituted benzothienopyrimidinyl, a substituted or unsubstituted benzoxazolyl, etc.; and the substituent(s) thereof, each independently, may be any one selected from the group consisting of a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a biphenyl, a phenanthrenyl, a terphenyl, a chrysenyl, a benzo[c]phenanthryl, a triphenylenyl, a dimethylfluorenyl, a diphenylfluorenyl, a dimethylbenzofluorenyl, a spirobifluorenyl, a pyridyl, a pyrimidinyl, a triazinyl substituted with a phenyl(s), a dibenzofuranyl unsubstituted or substituted with deuterium and/or a phenyl(s), a dibenzothiophenyl, a carbazolyl unsubstituted or substituted with a phenyl(s) and/or a biphenyl(s), a dibenzotelluriumyl, a dibenzoselenophenyl, a benzonaphthofuranyl, a benzonaphthothiophenyl, a phenanthrooxazolyl substituted with a phenyl(s), a triphenylsilyl, and a triphenylgermanyl; or the combination thereof. The substituent(s) of the substituted phenyl may be at least one selected from the group consisting of deuterium, a cyano, a fluoro, a methyl, a naphthyl, a carbazolyl, a triphenylsilyl, a triphenylgermanyl, and a dibenzotelluriumyl. The substituent(s) of the substituted naphthyl may be at least one selected from the group consisting of a phenyl, a biphenyl, and a chrysenyl. 
     According to one embodiment, La represents a single bond; a (C6-C25)arylene unsubstituted or substituted with at least one selected from the group consisting of deuterium, a (C1-C30)alkyl, and a (C6-C30)aryl; or a (5- to 25-membered)heteroarylene unsubstituted or substituted with a (C6-C30)aryl(s). For example, La may be a single bond; a phenylene unsubstituted or substituted with at least one of deuterium and a phenyl(s); a naphthylene unsubstituted or substituted with deuterium; a biphenylene unsubstituted or substituted with a phenyl(s); a phenanthrenylene; a terphenylene; a dimethylfluorenylene; a pyridylene; a dibenzofuranylene; a dibenzothiophenylene; a phenylcarbazolylene; a quinoxalinylene substituted with a phenyl(s); or a quinazolinylene, etc. 
     According to one embodiment, Ra to Rd, and Rh to Rk, each independently, represent hydrogen, deuterium, a cyano, a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (5- to 20-membered)heteroaryl; or may be linked to an adjacent substituent to form a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof. For example, Ra to Rd, and Ri to Rk, each independently, may be hydrogen, deuterium, a cyano, a methyl, a phenyl, a naphthyl, a biphenyl unsubstituted or substituted with deuterium, a phenylnaphthyl, a naphthylphenyl, a phenanthrenyl, a dimethylfluorenyl, a dibenzofuranyl unsubstituted or substituted with a phenyl(s), a dibenzothiophenyl unsubstituted or substituted with a phenyl(s), or a carbazolyl unsubstituted or substituted with a phenyl(s), etc.; or may be linked to an adjacent substituent to form a benzene ring, a benzofuran ring unsubstituted or substituted with a phenyl(s), or a benzothiophene ring unsubstituted or substituted with a phenyl(s), etc. For example, Rh may be a substituted phenyl, a naphthyl unsubstituted or substituted with a diphenyltriazinyl(s), a biphenyl, a phenanthrenyl, a dimethylfluorenyl, a pyridyl unsubstituted or substituted with a phenyl(s), a dibenzothiophenyl, a dibenzofuranyl, a phenylcarbazolyl, etc. The substituent(s) of the substituted phenyl may be at least one selected from the group consisting of deuterium, a cyano, a triazinyl substituted with a phenyl(s), a triphenylsilyl, and a triphenylgermanyl. 
     According to one embodiment, Re to Rg, each independently, represent an unsubstituted (C1-C20)alkyl, an unsubstituted (C6-C25)aryl, or an unsubstituted (5- to 20-membered)heteroaryl; and Rf and Rg may be linked to each other to form a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof. For example, Re may be a phenyl or a dibenzotelluriumyl. For example, Rf and Rg, each independently, may be a methyl or a phenyl, etc.; or Rf and Rg may be linked to each other to form a spirofluorene ring. 
     The compound represented by formula 11 may be at least one selected from the group consisting of the following compounds, but is not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The compound represented by formula 12 may be at least one selected from the group consisting of the following compounds, but is not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The compound represented by formula 13 or 14 may be at least one selected from the group consisting of the following compounds, but is not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The compound represented by formula 15 may be at least one selected from the group consisting of the following compounds, but is not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The dopant comprised in the organic electroluminescent device of the present disclosure may be at least one phosphorescent or fluorescent dopant, and is preferably a phosphorescent dopant. The phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but may be preferably selected from the group consisting of the metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably selected from the group consisting of ortho-metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably ortho-metallated iridium complex compounds. 
     The dopant comprised in the organic electroluminescent device of the present disclosure may be a compound represented by the following formula 101, but is not limited thereto. 
     
       
         
         
             
             
         
       
     
     L is any one selected from the following structures 1 to 3: 
     
       
         
         
             
             
         
       
     
     R 100  to R 103 , each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a cyano, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, quinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline, or indenoquinoline ring, together with pyridine; 
     R 104  to R 107 , each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a cyano, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine, or benzothienopyridine ring, together with benzene; 
     R 201  to R 220 , each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to an adjacent substituent to form a substituted or unsubstituted ring(s); and 
     s represents an integer of 1 to 3. 
     The specific examples of the dopant compound are as follows, but are not limited thereto. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The compound represented by formula 1 of the present disclosure may be comprised in one or more layers constituting the organic electroluminescent device, for example, at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, a light-emitting layer, an electron transport layer, an electron buffer layer, an electron injection layer, an interlayer, a hole blocking layer, and an electron blocking layer. Each of the layers may be further configured as a plurality of layers. 
     In addition, the compound represented by formula 1 of the present disclosure may be comprised in the hole transport zone and/or the light-emitting layer, but is not limited thereto. The compound represented by formula 1 of the present disclosure may be comprised in the hole transport zone as at least one of a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary layer material, and an electron blocking material, e.g., as a hole transport material. Furthermore, the compound represented by formula 1 of the present disclosure may be comprised in the light-emitting layer as a host, and may be used as a host having hole transport properties among hosts. 
     The present disclosure may comprise a hole transport zone between an anode and a light-emitting layer, and the hole transport zone may comprise at least one of a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer and an electron blocking layer. The hole injection layer, the hole transport layer, the hole auxiliary layer, the light-emitting auxiliary layer and the electron blocking layer, respectively, may be a single layer or a plurality of layers in which two or more layers are stacked. The hole injection layer may be multi-layers in order to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, wherein two compounds may be used simultaneously in each of the multi-layers. The electron blocking layer may be placed between the hole transport layer (or the hole injection layer) and the light-emitting layer, and can confine the excitons within the light-emitting layer by blocking the overflow of electrons from the light-emitting layer to prevent a light-emitting leakage. 
     In addition, the hole transport zone may comprise a p-doped hole injection layer, a hole transport layer, and a light-emitting auxiliary layer. Herein, the p-doped hole injection layer means a hole injection layer doped with a p-dopant. The p-dopant is a material capable of imparting p-type semiconductor properties. The p-type semiconductor properties mean the properties of injecting or transporting holes at the HOMO (highest occupied molecular orbital) energy level, i.e., the properties of a material having a high hole conductivity. 
     The organic electroluminescent material of the present disclosure, e.g., at least one of a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material, an electron buffer material, a hole blocking material, an electron transport material, an electron injection material and a light-emitting material (host material) may comprise a compound represented by formula 1. The organic electroluminescent material may be a hole transport material and/or a light-emitting material. The organic electroluminescent material may consist of the compound represented by formula 1 alone, or may further comprise conventional materials included in the organic electroluminescent material. For example, the organic electroluminescent material of the present disclosure may further comprise at least one compound represented by any one of formulas 11 to 15. When two or more materials are comprised in one layer, they may be mixture-evaporated to form a layer, or may be separately co-evaporated at the same time to form a layer. 
     The organic electroluminescent device of the present disclosure may comprise a first electrode, a second electrode, and at least one organic layer between the first and second electrodes. One of the first and second electrodes may be an anode, and the other may be a cathode. The organic layer may comprise at least one light-emitting layer, and may further comprise at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron transport layer, an electron buffer layer, an electron injection layer, an interlayer, a hole blocking layer, and an electron blocking layer. 
     The first electrode and the second electrode may each be formed with a transmissive conductive material, a transflective conductive material, or a reflective conductive material. The organic electroluminescent device may be a top emission type, a bottom emission type, or both-sides emission type depending on the type of the material forming the first electrode and the second electrode. In addition, the hole injection layer may be further doped with a p-dopant, and the electron injection layer may be further doped with an n-dopant. 
     The organic electroluminescent device of the present disclosure may comprise the compound represented by formula 1, and may further comprise conventional materials included in the organic electroluminescent material. The organic electroluminescent device comprising the organic electroluminescent compound represented by formula 1 of the present disclosure may exhibit low driving voltage and/or high power efficiency. 
     In addition, the organic electroluminescent material according to one embodiment of the present disclosure may be used as a light-emitting material for a white organic light-emitting device. The white organic light-emitting device has been suggested to have various structures such as a side-by-side structure or a stacking structure depending on the arrangement of R (red), G (green) or YG (yellow green), and B (blue) light-emitting parts, or color conversion material (CCM) method, etc. The present disclosure may also be applied to such a white organic light-emitting device. The organic electroluminescent material according to one embodiment of the present disclosure may also be used in an organic electroluminescent device comprising a quantum dot (QD). 
     Furthermore, the present disclosure may provide a display system using the compound represented by formula 1. In other words, it is possible to produce a display system or a lighting system by using the compound of the present disclosure. Specifically, it is possible to produce a display system, e.g., a display system for smart phones, tablets, notebooks, PCs, TVs, or cars; or a lighting system, e.g., an outdoor or indoor lighting system, by using the compound of the present disclosure. 
     Hereinafter, the preparation method of the compounds according to the present disclosure, the properties thereof, and the properties of the OLED comprising the organic electroluminescent compound according to the present disclosure will be explained in detail with reference to the representative compounds of the present disclosure. The following examples only describe the properties of the compound and the OLED comprising the same according to the present disclosure, but the present disclosure is not limited to the following examples. 
     Example 1: Preparation of Compound C-6 
     
       
         
         
             
             
         
       
     
     Synthesis of Compound 1-1 
     In a flask, 2-chloro-9,9-dimethyl-9H-fluorene (40.0 g, 150.0 mmol), (4-chloro-2-formylphenyl)boronic acid (55.3 g, 300.0 mmol), tetrakis(triphenylphosphine)palladium(0) (Pd(PPh 3 ) 4 ) (12.1 g, 10.50 mmol), and KOH (18.5 g, 330 mmol) were dissolved in 410 mL of o-xylene, 82 mL of acetonitrile, and 164 mL of distilled water, and the mixture was refluxed at 160° C. for 16 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate. The residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound 1-1 (18.9 g, yield: 56.8%). 
     Synthesis of Compound 1-2 
     (Methoxymethyl)triphenylphosphonium chloride (25.9 g, 75.5 mmol) and compound 1-1 (18.9 g, 56.8 mmol) were dissolved in 280 mL of tetrahydrofuran (THF). Thereafter, potassium tert-butoxide (tBuOK) (26.7 g, 237.6 mmol) was added at 0° C., and the temperature was raised, and then the mixture was stirred at room temperature for 3 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate. The residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound 1-2 (20.3 g, yield: 99.0%). 
     Synthesis of Compound 1-3 
     Compound 1-2 (20.3 g, 56.3 mmol) was dissolved in 284 mL of dichloromethane (DCM). Thereafter, boron trifluoride etherate (21.4 mL, 170.4 mmol) was added at 0° C., the temperature was raised, and the mixture was stirred at room temperature for 12 hours. After completion of the reaction, an aqueous NaHCO 3  solution was added, and an organic layer was extracted with dichloromethane. The residual moisture was removed with magnesium sulfate. The residue was distilled under reduced pressure and separated by column chromatography to obtain compound 1-3 (18.2 g, yield: 98.3%). 
     Synthesis of Compound C-6 
     Compound 1-3 (4.93 g, 15.0 mmol), bis(4-biphenylyl)amine (4.82 g, 15.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (687 mg, 0.75 mmol), tributylphosphine (0.728 mL, 1.50 mmol), and sodium tert-butoxide (NaOtBu) (4.32 g, 45.0 mmol) were dissolved in 75 mL of toluene, and the mixture was refluxed at 145° C. for 3 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-6 (4.7 g, yield: 54.7%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-6 
                 613.80 
                 275.3 
               
               
                   
                   
               
            
           
         
       
     
     Example 2: Preparation of Compound C-7 
     
       
         
         
             
             
         
       
     
     Compound 1-3 (4.93 g, 15.0 mmol), N-([1,1′-biphenyl]4-yl)-9,9-dimethyl-9H-fluoren-2-amine (5.42 g, 15.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (687 mg, 0.75 mmol), tributylphosphine (0.728 mL, 1.50 mmol), and NaOtBu (4.32 g, 45.0 mmol) were dissolved in 75 mL of toluene, and the mixture was refluxed at 145° C. for 3 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-7 (7.1 g, yield: 72.4%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-7 
                 653.87 
                 173.2 
               
               
                   
                   
               
            
           
         
       
     
     Example 3: Preparation of Compound C-39 
     
       
         
         
             
             
         
       
     
     Synthesis of Compound 2-1 
     In a flask, 2-chloro-9,9-dimethyl-9H-fluorene (40.0 g, 150.0 mmol), (5-chloro-2-formylphenyl)boronic acid (55.3 g, 300.0 mmol), Pd(PPh 3 ) 4  (12.1 g, 10.50 mmol), and KOH (18.5 g, 330 mmol) were dissolved in 410 mL of o-xylene, 82 mL of acetonitrile, and 164 mL of distilled water, and the mixture was refluxed at 160° C. for 16 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate. The residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound 2-1 (44.3 g, yield: 88.7%). 
     Synthesis of Compound 2-2 
     (Methoxymethyl)triphenylphosphonium chloride (60.1 g, 175.4 mmol) and compound 2-1 (43.9 g, 132.0 mmol) were dissolved in 528 mL of THF. Thereafter, potassium tert-butoxide (tBuOK) (26.7 g, 237.6 mmol) was added at 0° C., and the temperature was raised, and then the mixture was stirred at room temperature for 3 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate. The residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound 2-2 (39.5 g, yield: 82.9%). 
     Synthesis of Compound 2-3 
     Compound 2-2 (39.5 g, 109.5 mmol) was dissolved in 545 mL of DCM. Thereafter, boron trifluoride etherate (41.3 mL, 328.5 mmol) was added at 0° C., the temperature was raised, and the mixture was stirred at room temperature for 12 hours. After completion of the reaction, an aqueous NaHCO 3  solution was added, and an organic layer was extracted with dichloromethane. The residual moisture was removed with magnesium sulfate. The residue was distilled under reduced pressure and solidified with hexane to obtain compound 2-3 (30.4 g, yield: 84.4%). 
     Synthesis of Compound C-39 
     Compound 2-3 (4.34 g, 13.2 mmol), N-([1,1′-biphenyl]4-yl)-[1,1′:2′,1″-terphenyl]-2-amine (5.00 g, 12.6 mmol), tris(dibenzylideneacetone)dipalladium(0) (691 mg, 0.755 mmol), tributylphosphine (0.733 mL, 1.51 mmol), and NaOtBu (3.63 g, 37.7 mmol) were dissolved in 63 mL of toluene, and the mixture was refluxed at 145° C. for 16 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-39 (4.9 g, yield: 56.5%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-39 
                 689.90 
                 289.3 
               
               
                   
                   
               
            
           
         
       
     
     Example 4: Preparation of Compound C-40 
     
       
         
         
             
             
         
       
     
     Compound 2-3 (4.34 g, 13.2 mmol), N-([1,1′:3′,1″-terphenyl]-4′-yl)dibenzo[b,d]furan-2-amine (5.18 g, 12.6 mmol), tris(dibenzylideneacetone)dipalladium(0) (691 mg, 0.755 mmol), tributylphosphine (0.733 mL, 1.51 mmol), and NaOtBu (3.63 g, 37.7 mmol) were dissolved in 63 mL of toluene, and the mixture was refluxed at 145° C. for 3 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-40 (6.4 g, yield: 72.3%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-40 
                 703.88 
                 171.7 
               
               
                   
                   
               
            
           
         
       
     
     Example 5: Preparation of Compound C-26 
     
       
         
         
             
             
         
       
     
     Compound 2-3 (4.6 g, 14.0 mmol), bis(4-biphenylyl)amine (4.5 g, 14.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (641 mg, 0.7 mmol), tributylphosphine (0.680 mL, 1.40 mmol), and NaOtBu (4.04 g, 42.0 mmol) were dissolved in 75 mL of toluene, and the mixture was refluxed at 145° C. for 4 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-26 (4.2 g, yield: 48.9%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-26 
                 613.80 
                 221.2 
               
               
                   
                   
               
            
           
         
       
     
     Example 6: Preparation of Compound C-178 
     
       
         
         
             
             
         
       
     
     Compound 1-3 (5.06 g, 15.4 mmol), N-(3-(2-phenylpropan-2-yl)-phenyl)-[1,1′-biphenyl]-4-amine (5.09 g, 14.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (641 mg, 0.70 mmol), tributylphosphine (0.680 mL, 1.40 mmol), and NaOtBu (4.04 g, 42.0 mmol) were dissolved in 70 mL of toluene, and the mixture was refluxed at 145° C. for 3 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-178 (7.3 g, yield: 79.5%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-178 
                 655.88 
                 273.8 
               
               
                   
                   
               
            
           
         
       
     
     Example 7: Preparation of Compound C-179 
     
       
         
         
             
             
         
       
     
     Compound 2-3 (5.06 g, 15.4 mmol), 9,9-diphenyl-N-phenyl-9H-fluoren-2-amine (5.73 g, 14.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (641 mg, 0.700 mmol), tributylphosphine (0.680 mL, 1.40 mmol), and NaOtBu (4.04 g, 42.0 mmol) were dissolved in 70 mL of toluene, and the mixture was refluxed at 145° C. for 4 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-179 (8.0 g, yield: 81.4%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-179 
                 701.91 
                 243.0 
               
               
                   
                   
               
            
           
         
       
     
     Example 8: Preparation of Compound C-180 
     
       
         
         
             
             
         
       
     
     Compound 2-3 (6.04 g, 18.4 mmol), N-phenyldibenzo[b,d]selenophen-4-amine (5.64 g, 17.5 mmol), tris(dibenzylideneacetone)dipalladium(0) (801 mg, 0.875 mmol), tributylphosphine (0.850 mL, 1.75 mmol), and NaOtBu (5.05 g, 52.5 mmol) were dissolved in 88 mL of toluene, and the mixture was refluxed at 145° C. for 2 hours. After completion of the reaction, the mixture was distilled under reduced pressure and separated by column chromatography to obtain compound C-180 (9.0 g, yield: 83.6%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-180 
                 614.65 
                 170.7 
               
               
                   
                   
               
            
           
         
       
     
     Example 9: Preparation of Compound C-183 
     
       
         
         
             
             
         
       
     
     In a flask, compound 1-4 (0.25 g, 0.5 mmol), 2-bromo-N-(4-(naphthalen-2-yl)phenyl)-N-phenyl aniline (0.23 g, 0.55 mmol), PdCl 2 (Amphos) (0.017 g, 0.025 mmol), Na 2 CO 3  (0.1 g, 1.0 mmol), Aliquot 336 (0.01 g, 0.025 mmol), 5 mL of toluene, 1 mL of H 2 O were added, and the mixture was stirred at 120° C. for 18 hours. After completion of the reaction, the mixture was cooled to room temperature, and distilled under reduced pressure, and then separated by column chromatography to obtain compound C-183 (0.1 g, yield: 29%). 
     
       
         
           
               
               
             
               
                   
                   
               
               
                   
                 MW 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 C-183 
                 663.86 
               
               
                   
                   
               
            
           
         
       
     
     Example 10: Preparation of Compound C-185 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     Synthesis of Compound 1 
     In a flask, 2-bromo-9,9-diphenyl-9H-fluorene (30 g, 75.5 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi(1,3,2-dioxaborolane) (28 g, 113.2 mmol), KOAc (14.8 g, 151 mmol), and PdCl 2 (PPh 3 ) 2  (4.3 g, 3.77 mmol) were dissolved in 500 mL of 1,4-dioxane, and the mixture was stirred under reflux at 150° C. for 3 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate and the residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound 1 (35 g, yield: 100%). 
     Synthesis of Compound 2 
     In a flask, compound 1 (35 g, 78.7 mmol), 2-bromo-6-chlorobenzaldehyde (17 g, 78.7 mmol), Pd(PPh 3 ) 4  (4.5 g, 3.93 mmol), K 2 CO 3  (21 g, 154.8 mmol), 546 mL of toluene, 273 mL of EtOH, and 273 mL of H 2 O were added, and the mixture was stirred under reflux at 130° C. for 3 hours. After completion of the reaction, methanol and water were added and stirred, and the solvent was removed by filtration under reduced pressure. After separation by column chromatography, methanol was added to produce a solid. The resulting solid was filtered under reduced pressure to obtain compound 2 (30 g, yield: 83.4%). 
     Synthesis of Compound 3 
     In a flask, compound 2 (30 g, 65.6 mmol), (methoxymethyl)triphenylphosphonium chloride (33 g, 98.5 mmol), and KOtBu (15.1 g, 98.5 mmol) were dissolved in 326 mL of THF, and the mixture was stirred at room temperature for 2 hours. After completion of the reaction, MeOH and water were added and stirred, and the solvent was removed by filtration under reduced pressure. After separation by column chromatography, MeOH was added to produce a solid. The resulting solid was filtered under reduced pressure to obtain compound 3 (40 g, yield: over yield %). 
     Synthesis of Compound 4 
     In a flask, compound 3 (40 g, 82.4 mmol) was dissolved in 500 mL of methylene chloride, and TfOH (trifluoromethane sulfonic acid) (7.2 mL, 82.4 mmol) was slowly added dropwise, followed by stirring at room temperature for 1 hour. After completion of the reaction, MeOH and water were added and stirred, and the solvent was removed by filtration under reduced pressure. After separation by column chromatography, MeOH was added to produce a solid. The resulting solid was filtered under reduced pressure to obtain compound 4 (24 g, yield: 64%). 
     Synthesis of Compound C-185 
     In a flask, compound 4 (5 g, 15.21 mmol), compound 5 (5.4 g, 16.73 mmol), NaOtBu (2.9 g, 30.42 mmol), S-Phos (499 mg, 1.21 mmol), and Pd 2 (dba) 3  (696 mg, 0.76 mmol) were dissolved in 76 mL of xylene, and the mixture was stirred under reflux at 130° C. for 12 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate. The residual moisture was removed with magnesium sulfate. The residue was dried and separated by column chromatography to obtain compound C-185 (3.5 g, yield: 37.1%). 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 MW 
                 M.P. (° C.) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 C-185 
                 751.93 
                 309 
               
               
                   
                   
               
            
           
         
       
     
     Device Examples 1 to 7: Producing a Red OLED Comprising the Organic Electroluminescent Compound According to the Present Disclosure 
     OLEDs according to the present disclosure were produced. A transparent electrode indium tin oxide (ITO) thin film (10 Ω/sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to an ultrasonic washing with acetone and isopropyl alcohol, sequentially, and then was stored in isopropyl alcohol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 as a hole injection compound was introduced into a cell of the vacuum vapor deposition apparatus, and compound HT-1 as a hole transport compound was introduced into another cell of the vacuum vapor deposition apparatus. The two materials were evaporated at different rates, and compound HI-1 was deposited in a doping amount of 3 wt % based on the total amount of compound HI-1 and compound HT-1 to form a hole injection layer having a thickness of 10 nm on the ITO substrate. Next, compound HT-1 was deposited on the hole injection layer to form a first hole transport layer having a thickness of 90 nm. The compound of the second hole transport layer shown in Table 1 below was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer. After forming the hole injection layer and the hole transport layers, a light-emitting layer was formed thereon as follows: Compound RH-1 and compound RH-2 were introduced into two cells of the vacuum vapor deposition apparatus as hosts, and compound D-39 was introduced into another cell as a dopant. Compound RH-1 and compound RH-2 as hosts were evaporated at a rate of 5:5 and the dopant material was simultaneously evaporated at a different rate, and the dopant was deposited in a doping amount of 2 wt % based on the total amount of the hosts and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer. Next, compound HBL was deposited as an electron buffer layer having a thickness of 5 nm on the light-emitting layer. Thereafter, compound ETL-1 and compound EIL-1 were evaporated in a weight ratio of 5:5 to deposit an electron transport layer having a thickness of 30 nm on the electron buffer layer. After depositing compound EIL-1 as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thus, an OLED was produced. All the materials used for producing the OLED were purified by vacuum sublimation at 10 −6  torr. 
     Comparative Example 1: Producing a Red OLED Comprising a Comparative Compound 
     An OLED was produced in the same manner as in Device Example 1, except that compound A was used as the second hole transport layer. 
     The driving voltage, power efficiency, and CIEx,y (1931) chromaticity coordinates at a luminance of 1,000 nit of the OLEDs produced in Device Examples 1 to 7, and Comparative Example 1 are provided in Table 1 below. 
     
       
         
           
               
               
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Second Hole 
                 Driving 
                 Power 
                 CIE Chromaticity 
               
               
                   
                 Transport 
                 Voltage 
                 Efficiency 
                 Coordinates 
               
               
                   
                 Layer 
                 [V] 
                 [lm/W] 
                 (x, y) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Device 
                 C-6 
                 2.8 
                 33.1 
                 (0.661, 0.339) 
               
               
                 Example 1 
               
               
                 Device 
                 C-7 
                 2.8 
                 30.1 
                 (0.657, 0.342) 
               
               
                 Example 2 
               
               
                 Device 
                 C-39 
                 2.9 
                 28.1 
                 (0.656, 0.343) 
               
               
                 Example 3 
               
               
                 Device 
                 C-40 
                 2.8 
                 33.0 
                 (0.658, 0.341) 
               
               
                 Example 4 
               
               
                 Device 
                 C-178 
                 3.0 
                 26.8 
                 (0.656, 0.343) 
               
               
                 Example 5 
               
               
                 Device 
                 C-180 
                 3.0 
                 26.0 
                 (0.654, 0.344) 
               
               
                 Example 6 
               
               
                 Device 
                 C-179 
                 2.8 
                 34.5 
                 (0.656, 0.343) 
               
               
                 Example 7 
               
               
                 Comparative 
                 A 
                 4.2 
                 21.4 
                 (0.662, 0.338) 
               
               
                 Example 1 
               
               
                   
               
            
           
         
       
     
     From Table 1 above, it can be confirmed that the organic electroluminescent device comprising the compound according to the present disclosure as a hole transport layer material exhibits superior properties, particularly lower driving voltage and/or higher power efficiency compared to the organic electroluminescent device using the conventional compound. 
     Without being limited by theory, it is understood that the excellent effect of the compound of the present disclosure as described above is due to the following properties. The indeno[1,2-b]phenanthrene compound of the present disclosure may exhibit sufficient triplet energy in the hole transport layer due to the high triplet energy of phenanthrene. In addition, indeno[1,2-b]phenanthrene core does not contain a heteroatom, which has additional lone pairs that can possibly interrupt hole transition, thereby allowing the hole flow to be properly regulated. Thus, the performance of the device including the same can be improved. Furthermore, indeno[1,2-b]phenanthrene may show a high glass transition temperature (Tg) and/or a high refractive index, which is advantageous in terms of morphological stability, since heat generation cannot be avoided during OLED device operation. 
     Device Examples 8 to 10: Producing a Red OLED Comprising the Organic Electroluminescent Compound According to the Present Disclosure 
     OLEDs according to the present disclosure were produced. A transparent electrode indium tin oxide (ITO) thin film (10 Ω/sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to an ultrasonic washing with acetone and isopropyl alcohol, sequentially, and then was stored in isopropyl alcohol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 was introduced into a cell of the vacuum vapor deposition apparatus, and compound HT-2 was introduced into another cell of the vacuum vapor deposition apparatus. The two materials were evaporated at different rates, and compound HI-1 was deposited in a doping amount of 3 wt % based on the total amount of compound HI-1 and compound HT-2 to form a hole injection layer having a thickness of 10 nm on the ITO substrate. Next, compound HT-2 was deposited on the hole injection layer to form a first hole transport layer having a thickness of 80 nm. Compound HT-3 was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer. After forming the hole injection layer and the hole transport layers, a light-emitting layer was formed thereon as follows: the first and second host compounds shown in Table 2 below were introduced into two cells of the vacuum vapor deposition apparatus as hosts, and compound D-39 was introduced into another cell as a dopant. The two host materials were evaporated at a rate of 1:1 and the dopant material was simultaneously evaporated at a different rate, and the dopant was deposited in a doping amount of 3 wt % based on the total amount of the hosts and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer. Thereafter, compound ETL-2 and compound EIL-1 were evaporated in a weight ratio of 50:50 to deposit an electron transport layer having a thickness of 35 nm on the light-emitting layer. After depositing compound EIL-1 as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thus, an OLED was produced. All the materials used for producing the OLED were purified by vacuum sublimation at 10 −6  torr. 
     Comparative Example 2: Producing an OLED Comprising a Comparative Compound as a Single Host 
     An OLED was produced in the same manner as in Device Example 8, except that compound RH-2 was used as a single host of the light-emitting layer. 
     Comparative Example 3: Producing an OLED Comprising a Comparative Compound as the First Host 
     An OLED was produced in the same manner as in Device Example 8, except that the first host compound shown in Table 2 below was used as the first host of the light-emitting layer. 
     The driving voltage, luminous efficiency, and light-emitting color at a luminance of 1,000 nit, and the time taken for luminance to decrease from 100% to 95% (lifetime; T95) at a luminance of 10,000 nit of the OLEDs produced in Device Examples 8 to 10, and Comparative Examples 2 and 3 are provided in Table 2 below. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                   
                   
                   
                 Driving 
                 Luminous 
                 Light- 
                 Lifetime 
               
               
                   
                 First  
                 Second 
                 Voltage 
                 Efficiency 
                 Emitting 
                 (T95) 
               
               
                   
                 Host 
                 Host 
                 [V] 
                 [cd/A] 
                 Color 
                 [hr] 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Device 
                 C-26 
                 RH-2 
                 3.0 
                 35.1 
                 Red 
                 120 
               
               
                 Example 8 
                   
                   
                   
                   
                   
                   
               
               
                 Device 
                 C-6 
                 RH-2 
                 3.0 
                 33.0 
                 Red 
                 293 
               
               
                 Example 9 
                   
                   
                   
                   
                   
                   
               
               
                 Device 
                 C-179 
                 RH-2 
                 3.0 
                 34.6 
                 Red 
                 142 
               
               
                 Example 10 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 — 
                 RH-2 
                 3.5 
                 31.8 
                 Red 
                 18 
               
               
                 Example 2 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 A 
                 RH-2 
                 3.4 
                 33.1 
                 Red 
                 113 
               
               
                 Example 3 
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     From Table 2 above, it can be confirmed that the organic electroluminescent device comprising the compound according to the present disclosure as a host material exhibits superior properties, particularly low driving voltage, high luminous efficiency, and/or long lifetime properties compared to the organic electroluminescent device using the conventional compound. 
     The compounds used in the Device Examples and the Comparative Examples are shown in Table 3 below. 
     
       
         
           
               
               
             
               
                 TABLE 3 
               
               
                   
               
             
            
               
                 Hole Injection Layer/ Hole Transport Layer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Second Hole Transport Layer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Light-Emitting Layer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Electron Buffer Layer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Electron Transport Layer/Electron Injection Layer