Organic Light Emitting Device

The present disclosure relates to an organic light emitting device that includes a substrate, and an organic light emitting diode positioned on the substrate and including a first electrode, a second electrode facing the first electrode, and a first emitting material layer including a first dopant of a boron derivative and a first host of an anthracene derivative and positioned between the first and second electrodes, wherein the first host is deuterated.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Republic of Korea Patent Application No. 10-2020-0184953 filed in the Republic of Korea on Dec. 28, 2020, which is hereby incorporated by reference in its entirety.

FIELD OF TECHNOLOGY

The present disclosure relates to an organic light emitting device, and more specifically, to an organic light emitting diode (OLED) having enhanced emitting efficiency and lifespan and an organic light emitting device including the same.

BACKGROUND

As requests for a flat panel display device having a small occupied area have been increased, an organic light emitting display device including an OLED has been the subject of recent research and development.

The OLED emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emitting material layer (EML), combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state. A flexible substrate, for example, a plastic substrate, can be used as a base substrate where elements are formed. In addition, the organic light emitting display device can be operated at a voltage (e.g., 10V or below) lower than a voltage required to operate other display devices. Moreover, the organic light emitting display device has advantages in the power consumption and the color sense.

The OLED includes a first electrode as an anode over a substrate, a second electrode, which is spaced apart from and faces the first electrode, and an organic emitting layer therebetween.

For example, the organic light emitting display device may include a red pixel region, a green pixel region and a blue pixel region, and the OLED may be formed in each of the red, green, and blue pixel regions.

However, the OLED in the blue pixel does not provide sufficient emitting efficiency and lifespan such that the organic light emitting display device has a limitation in the emitting efficiency and the lifespan.

SUMMARY

The present disclosure is directed to an OLED and an organic light emitting device including the OLED that substantially obviate one or more of the problems associated with the limitations and disadvantages of the related conventional art.

Additional features and advantages of the present disclosure are set forth in the description which follows, and will be apparent from the description, or evident by practice of the present disclosure. The objectives and other advantages of the present disclosure are realized and attained by the features described herein as well as in the appended drawings.

To achieve these and other advantages in accordance with the purpose of the embodiments of the present disclosure, as described herein, an aspect of the present disclosure is an organic light emitting device including a substrate, and an organic light emitting diode positioned on the substrate and including a first electrode, a second electrode facing the first electrode, and a first emitting material layer including a first dopant of a boron derivative and a first host of an anthracene derivative and positioned between the first and second electrodes, wherein the first dopant is represented by Formula 1-1 or 1-2:

wherein in Formula 1-1, each of R11to R14and each of R21to R24is selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl, or adjacent two of R11to R14and R21to R24are connected to each other to form a fused ring,wherein each of R31and R41is independently selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl,wherein R51is selected from the group consisting of hydrogen, C1to C10alkyl group, C3to C15cycloalkyl group unsubstituted or substituted with C1to C10alkyl, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl and C5to C30hetero-ring group unsubstituted or substituted with C1to C10alkyl,wherein when each of R31, R41and R51is C6to C30aryl group substituted with C1to C10alkyl, these alkyl groups may be connected to each other to form a fused ring,wherein in Formula 1-2, X is one of NR1, CR2R3, O, S, Se, SiR4R5, and each of R1, R2, R3, R4and R5is independently selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group, C5to C30heteroaryl group, C3to C30cycloalkyl group and C3to C30alicyclic group,wherein each of R61to R64is independently selected from the group consisting of hydrogen, deuterium, C1to C10alkyl group unsubstituted or substituted with deuterium, C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, or adjacent two of R61to R64are connected to each other to form a fused ring,wherein each of R71to R74is independently selected from the group consisting of hydrogen, deuterium, C1to C10alkyl group and C3to C30alicyclic group,wherein R81is selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, or is connected with R61to form a fused ring,wherein R82is selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl,wherein R91is selected from the group consisting of hydrogen, C1to C10alkyl group, C3to C15cycloalkyl group unsubstituted or substituted with C1to C10alkyl, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl,wherein when each of R81, R82and R91is C6to C30aryl group substituted with C1to C10alkyl, alkyl group is connected to each other to form a fused ring, wherein the first host is represented by Formula 2:

wherein in Formula 2, each of Ar1 and Ar2 is independently C6to C30aryl group or C5to C30heteroaryl group, and L is a single bond or C6to C30arylene group, wherein a is an integer of 0 to 8, each of b, c and d is independently an integer of 0 to 30, and wherein at least one of a, b, c and d is a positive integer.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to further explain the present disclosure as claimed.

DETAILED DESCRIPTION

Reference will now be made in detail to some of the examples and preferred embodiments, which are illustrated in the accompanying drawings.

FIG. 1is a schematic circuit diagram illustrating an organic light emitting display device of the present disclosure.

As illustrated inFIG. 1, a gate line GL and a data line DL, which cross each other to define a pixel (pixel region) P, and a power line PL are formed in an organic light emitting display device. A switching thin film transistor (TFT) Ts, a driving TFT Td, a storage capacitor Cst and an OLED D are formed in the pixel P. The pixel P may include a red pixel, a green pixel and a blue pixel.

The switching thin film transistor Ts is connected to the gate line GL and the data line DL, and the driving thin film transistor Td and the storage capacitor Cst are connected between the switching thin film transistor Ts and the power line PL. The OLED D is connected to the driving thin film transistor Td. When the switching thin film transistor Ts is turned on by the gate signal applied through the gate line GL, the data signal applied through the data line DL is applied to a gate electrode of the driving thin film transistor Td and one electrode of the storage capacitor Cst through the switching thin film transistor Ts.

The driving thin film transistor Td is turned on by the data signal applied into the gate electrode so that a current proportional to the data signal is supplied from the power line PL to the OLED D through the driving thin film transistor Td. The OLED D emits light having a luminance proportional to the current flowing through the driving thin film transistor Td. In this case, the storage capacitor Cst is charge with a voltage proportional to the data signal so that the voltage of the gate electrode in the driving thin film transistor Td is kept constant during one frame. Therefore, the organic light emitting display device can display a desired image.

FIG. 2is a schematic cross-sectional view illustrating an organic light emitting display device according to a first embodiment of the present disclosure.

As illustrated inFIG. 2, the organic light emitting display device100includes a substrate110, a TFT Tr and an OLED D connected to the TFT Tr. For example, the organic light emitting display device100may include a red pixel, a green pixel, and a blue pixel, and the OLED D may be formed in each of the red, green, and blue pixels. Namely, the OLEDs D emitting red light, green light, and blue light may be provided in the red, green, and blue pixels, respectively.

The substrate110may be a glass substrate or a flexible substrate. For example, the flexible substrate may be one of a polyimide (PI) substrate, polyethersulfone (PES), polyethylenenaphthalate (PEN), polyethylene terephthalate (PET) and polycarbonate (PC).

A buffer layer120is formed on the substrate, and the TFT Tr is formed on the buffer layer120. The buffer layer120may be omitted.

A semiconductor layer122is formed on the buffer layer120. The semiconductor layer122may include an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer122includes the oxide semiconductor material, a light-shielding pattern (not shown) may be formed under the semiconductor layer122. The light to the semiconductor layer122is shielded or blocked by the light-shielding pattern such that thermal degradation of the semiconductor layer122can be prevented. On the other hand, when the semiconductor layer122includes polycrystalline silicon, impurities may be doped into both sides of the semiconductor layer122.

A gate insulating layer124is formed on the semiconductor layer122. The gate insulating layer124may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode130, which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer124to correspond to a center of the semiconductor layer122.

InFIG. 2, the gate insulating layer124is formed on an entire surface of the substrate110. Alternatively, the gate insulating layer124may be patterned to have the same shape as the gate electrode130.

An interlayer insulating layer132, which is formed of an insulating material, is formed on the gate electrode130. The interlayer insulating layer132may be formed of an inorganic insulating material, e.g., silicon oxide or silicon nitride, or an organic insulating material, e.g., benzocyclobutene or photo-acryl.

The interlayer insulating layer132includes first and second contact holes134and136exposing both sides of the semiconductor layer122. The first and second contact holes134and136are positioned at both sides of the gate electrode130to be spaced apart from the gate electrode130.

The first and second contact holes134and136are formed through the gate insulating layer124. Alternatively, when the gate insulating layer124is patterned to have the same shape as the gate electrode130, the first and second contact holes134and136is formed only through the interlayer insulating layer132.

A source electrode140and a drain electrode142, which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer132.

The source electrode140and the drain electrode142are spaced apart from each other with respect to the gate electrode130and respectively contact both sides of the semiconductor layer122through the first and second contact holes134and136.

The semiconductor layer122, the gate electrode130, the source electrode140and the drain electrode142constitute the TFT Tr. The TFT Tr serves as a driving element. Namely, the TFT Tr may correspond to the driving TFT Td (ofFIG. 1).

In the TFT Tr, the gate electrode130, the source electrode140, and the drain electrode142are positioned over the semiconductor layer122. Namely, the TFT Tr has a coplanar structure.

Alternatively, in the TFT Tr, the gate electrode may be positioned under the semiconductor layer, and the source and drain electrodes may be positioned over the semiconductor layer such that the TFT Tr may have an inverted staggered structure. In this instance, the semiconductor layer may include amorphous silicon.

Although not shown, the gate line and the data line cross each other to define the pixel, and the switching TFT is formed to be connected to the gate and data lines. The switching TFT is connected to the TFT Tr as the driving element.

In addition, the power line, which may be formed to be parallel to and spaced apart from one of the gate and data lines, and the storage capacitor for maintaining the voltage of the gate electrode of the TFT Tr in one frame may be further formed.

A passivation layer (or a planarization layer)150, which includes a drain contact hole152exposing the drain electrode142of the TFT Tr, is formed to cover the TFT Tr.

A first electrode160, which is connected to the drain electrode142of the TFT Tr through the drain contact hole152, is separately formed in each pixel and on the passivation layer150. The first electrode160may be an anode and may be formed of a conductive material, e.g., a transparent conductive oxide (TCO), having a relatively high work function. For example, the first electrode160may be formed of indium-tin-oxide (ITO), indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper-oxide (ICO) or aluminum-zinc-oxide (Al:ZnO, AZO).

When the organic light emitting display device100is operated in a bottom-emission type, the first electrode160may have a single-layered structure of the transparent conductive oxide. When the organic light emitting display device100is operated in a top-emission type, a reflection electrode or a reflection layer may be formed under the first electrode160. For example, the reflection electrode or the reflection layer may be formed of silver (Ag) or aluminum-palladium-copper (APC) alloy. In this instance, the first electrode160may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO.

A bank layer166is formed on the planarization layer150to cover an edge of the first electrode160. Namely, the bank layer166is positioned at a boundary of the pixel and exposes a center of the first electrode160in the pixel.

An organic emitting layer162is formed on the first electrode160. The organic emitting layer162may have a single-layered structure of an emitting material layer including an emitting material. To increase an emitting efficiency of the OLED D and/or the organic light emitting display device100, the organic emitting layer162may have a multi-layered structure.

The organic emitting layer162is separated in each of the red, green and blue pixels. As illustrated below, the organic emitting layer162in the blue pixel includes a host of an anthracene derivative (an anthracene compound), at least a part of hydrogens of which is substituted with deuterium (deuterated), and a dopant of a boron derivative (a boron compound) such that the emitting efficiency and the lifespan of the OLED D in the blue pixel are improved.

The second electrode164is formed over the substrate110where the organic emitting layer162is formed. The second electrode164covers an entire surface of the display area and may be formed of a conductive material having a relatively low work function to serve as a cathode. For example, the second electrode164may be formed of aluminum (Al), magnesium (Mg), silver (Ag) or their alloy, e.g., Al—Mg alloy (AlMg) or Ag—Mg alloy (MgAg). In the top-emission type organic light emitting display device100, the second electrode164may have a thin profile (small thickness) to provide a light transmittance property (or a semi-transmittance property).

The first electrode160, the organic emitting layer162and the second electrode164constitute the OLED D.

An encapsulation film170is formed on the second electrode164to prevent penetration of moisture into the OLED D. The encapsulation film170includes a first inorganic insulating layer172, an organic insulating layer174and a second inorganic insulating layer176sequentially stacked, but it is not limited thereto. The encapsulation film170may be omitted.

The organic light emitting display device100may further include a polarization plate (not shown) for reducing an ambient light reflection. For example, the polarization plate may be a circular polarization plate. In the bottom-emission type organic light emitting display device100, the polarization plate may be disposed under the substrate110. In the top-emission type organic light emitting display device100, the polarization plate may be disposed on or over the encapsulation film170.

In addition, in the top-emission type organic light emitting display device100, a cover window (not shown) may be attached to the encapsulation film170or the polarization plate. In this instance, the substrate110and the cover window have a flexible property such that a flexible organic light emitting display device may be provided.

FIG. 3is a schematic cross-sectional view illustrating an OLED having a single emitting part for the organic light emitting display device according to the first embodiment of the present disclosure.

As illustrated inFIG. 3, the OLED D includes the first electrode160and the second electrode164, which face each other, and the organic emitting layer162therebetween. The organic emitting layer162includes an emitting material layer (EML)240between the first and second electrodes160and164. The organic light emitting display device100(ofFIG. 2) includes red, green and blue pixels, and the OLED D may be positioned in the blue pixel.

One of the first and second electrodes160and164is an anode, and the other one of the first and second electrodes160and164is a cathode. One of the first and second electrodes160and164is a transparent electrode (or a semi-transparent electrode) electrode, and the other one of the first and second electrodes160and164is a reflection electrode.

The organic emitting layer162may further include an electron blocking layer (EBL)230between the first electrode160and the EML240and a hole blocking layer (HBL)250between the EML240and the second electrode164.

In addition, the organic emitting layer162may further include a hole transporting layer (HTL)220between the first electrode160and the EBL230.

Moreover, the organic emitting layer162may further include a hole injection layer (HIL)210between the first electrode160and the HTL220and an electron injection layer (EIL)260between the second electrode164and the HBL250.

For example, the HIL210may include at least one compound selected from the group consisting of 4,4′,4″-tris(3-methylphenylamino)triphenylamine (MTDATA), 4,4′,4″-tris(N,N-diphenyl-amino)triphenylamine (NATA), 4,4′,4″-tris(N-(naphthalene-1-yl)-N-phenyl-amino)triphenylamine (1T-NATA), 4,4′,4″-tris(N-(naphthalene-2-yl)-N-phenyl-amino)triphenylamine (2T-NATA), copper phthalocyanine (CuPc), tris(4-carbazoyl-9-yl-phenyl)amine (TCTA), N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB or NPD), 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(dipyrazino[2,3-f:2′3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), poly(3,4-ethylenedioxythiphene)polystyrene sulfonate (PEDOT/PSS) and N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine Alternatively, the HIL 210 may include a compound in Formula 5 as a host and a compound in Formula 6 as a dopant.

The EBL230, which is positioned between the HTL220and the EML240to block the electron from the EML240toward the HTL220, may include at least one compound selected from the group consisting of TCTA, tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, TAPC, MTDATA, 1,3-bis(carbazol-9-yl)benzene (mCP), 3,3′-bis(N-carbazolyl)-1,1′-biphenyl (mCBP), CuPc, N,N′-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD), TDAPB, DCDPA, and 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene). Alternatively, the EBL230may include a compound in Formula 7.

The HBL250, which is positioned between the EML240and the EIL260to block the hole from the EML240toward the EIL260, may include at least one compound selected from the group consisting of tris-(8-hydroxyquinoline aluminum (Alq3), 2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), spiro-PBD, lithium quinolate (Liq), 2,2′,2′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H benzimidazole) (TPBi), bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-bis(naphthalene-2-yl)4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-dimethyl-4,7-diphenyl-1,10-phenathroline (BCP), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-tri(p-pyrid-3-yl-phenyl)benzene (TpPyPB), 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)1,3,5-triazine (TmPPPyTz), Poly[9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)] (PFNBr), tris(phenylquinoxaline (TPQ), and diphenyl-4-triphenylsilyl-phenylphosphine oxide (TSPO1). Alternatively, the HBL250may include a pyrimidine derivative, e.g., a compound in Formula 8, as a hole blocking material. The compound in Formula 8 has an electron transporting property such that an ETL may be omitted. In this instance, the HBL250may directly contact the EIL260. Alternatively, the HBL250may directly contact the second electrode without the EIL260.

The EIL260may include at least one of an alkali metal, such as Li, an alkali halide compound, such as LiF, CsF, NaF, or BaF2, and an organo-metallic compound, such as Liq, lithium benzoate, or sodium stearate, but it is not limited thereto. Alternatively, the EIL260may include a compound in Formula 9 as a host and an alkali metal as a dopant.

The EML240includes the dopant242of a boron derivative and the host244of a deuterated anthracene derivative and provides blue emission. Namely, at least one hydrogen in an anthracene derivative is substituted with deuterium, and it may be referred to as a deuterated anthracene derivative. The boron derivative is not substituted with deuterium, or a part of hydrogens of a boron derivative is substituted with deuterium. It may be referred to as a non-deuterated boron derivative or a partially-deuterated boron derivative.

In the EML240, the host244is partially or wholly deuterated, and the dopant242is non-deuterated or partially deuterated.

The boron derivative as the dopant242may be represented by Formula 1-1 or 1-2.

In Formula 1-1, each of R11to R14and each of R21to R24is selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl, or adjacent two of R11to R14and R21to R24are connected (combined, linked or joined) to each other to form a fused ring. Each of R31and R41is independently selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl. R51is selected from the group consisting of hydrogen, C1to C10alkyl group, C3to C15cycloalkyl group unsubstituted or substituted with C1to C10alkyl, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl, C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl and C5to C30hetero-ring group (e.g., heteroalicyclic group) unsubstituted or substituted with C1to C10alkyl.

When each of R31, R41and R51is C6to C30aryl group substituted with C1to C10alkyl, these alkyl groups may be connected to each other to form a fused ring.

For example, in Formula 1-1, each of R11to R14, each of R21to R24and each of R31and R41may be independently selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl and C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, and R51may be selected from the group consisting of C1to C10alkyl group, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl and C5to C30hetero-ring group unsubstituted or substituted with C1to C10alkyl.

In an exemplary embodiment, in Formula 1-1, one of R11to R14and one of R21to R24may be C1to C10alkyl group, and the rest of R11to R14and the rest of R21to R24may be hydrogen. Each of R31and R41may be phenyl substituted with C1to C10alkyl or dibenzofuranyl substituted with C1to C10alkyl. R51may be alkyl group, diphenylamino group, heteroaryl group containing nitrogen, or hetero-ring group containing nitrogen. In this instance, C1to C10alkyl group may be tert-butyl.

Without other description, the fused ring may be C3 to C10 alicyclic ring.

In Formula 1-2, X is one of NR1, CR2R3, O, S, Se, SiR4R5, and each of R1, R2, R3, R4and R5is independently selected from the group consisting of hydrogen, C1to C10alkyl group, C6to C30aryl group, C5to C30heteroaryl group, C3to C30cycloalkyl group and C3to C30alicyclic group. Each of R61to R64is independently selected from the group consisting of hydrogen, deuterium, C1to C10alkyl group unsubstituted or substituted with deuterium, C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, or adjacent two of R61to R64are connected to each other to form a fused ring. Each of R71to R74is independently selected from the group consisting of hydrogen, deuterium, C1to C10alkyl group and C3to C30alicyclic group. R81is selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, or is connected with R61to form a fused ring. R82is selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, and R91is selected from the group consisting of hydrogen, C1to C10alkyl group, C3to C15cycloalkyl group unsubstituted or substituted with C1to C10alkyl, C6to C30aryl group unsubstituted or substituted with C1to C10alkyl, C5to C30heteroaryl group unsubstituted or substituted with C1to C10alkyl, C6to C30arylamino group unsubstituted or substituted with C1to C10alkyl and C3to C30alicyclic group unsubstituted or substituted with C1to C10alkyl.

When each of R81, R82and R91is C6to C30aryl group substituted with C1to C10alkyl, these alkyl groups may be connected to each other to form a fused ring.

For example, in Formula 1-2, X may be O or S. Each of R61to R64may be independently selected from the group consisting of hydrogen, deuterium, C1to C10alkyl group and C6to C30arylamino group unsubstituted or substituted with deuterium, or adjacent two of R61to R64may be connected to form a fused ring. Each of R71to R74may be independently selected from the group consisting of hydrogen, deuterium and C1to C10alkyl. R81may be selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, or may be connected with R61to form a fused ring. R82may be selected from the group consisting of C6to C30aryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and C5to C30heteroaryl group unsubstituted or substituted with at least one of deuterium and C1to C10alkyl, and R91may be selected from the group consisting of C1to C10alkyl group.

In an exemplary embodiment, in Formula 1-2, X may be O. Each of R61to R64may be independently selected from the group consisting of hydrogen, deuterium and diphenylamino, or adjacent two of R61to R64may be connected to form a fused ring. In this instance, diphenylamino and the fused ring may be deuterated. Each of R71to R74may be independently selected from the group consisting of hydrogen, deuterium and C1to C10alkyl. Each of R81and R82may be independently selected from the group consisting of phenyl unsubstituted or substituted with at least one of deuterium and C1to C10alkyl and dibenzofuranyl unsubstituted or substituted with at least one of deuterium and C1to C10alkyl. R91may be C1to C10alkyl group. In this instance, C1to C10alkyl group may be tert-butyl.

In further exemplary embodiment, in Formula 1-2, R73may be C1to C10alkyl group, and each of R71, R72and R74may be independently hydrogen or deuterium.

In the boron derivative in Formula 1-2, other aromatic ring and hetero-aromatic ring except a benzene ring, which is combined to boron atom and two nitrogen atoms, may be deuterated. Namely, in Formula 1-2, R91may be not deuterium.

The deuterated anthracene derivative as the host244may be represented by Formula 2:

In Formula 2, each of Ar1 and Ar2 is independently C6to C30aryl group or C5to C30heteroaryl group, and L is a single bond or C6to C30arylene group. In addition, a is an integer of 0 to 8, each of b, c and d is independently an integer of 0 to 30, and at least one of a, b, c and d is a positive integer. (D denotes a deuterium atom, and each of a, b, c and d denotes a number of deuterium atoms.)

Ar1 and Ar2 may be same or different.

In Formula 2, Ar1 and Ar2 may be selected from the group consisting of phenyl, naphthyl, dibenzofuranyl, phenyl-dibenzofuranyl and a fused dibenzofuranyl, and L may be the single bond or phenylene.

For example, Ar1 may be selected from the group consisting of naphthyl, dibenzofuranyl, phenyl-dibenzofuranyl and a fused dibenzofuranyl, Ar2 may be selected from the group consisting of phenyl and naphthyl, and L may be the single bond or phenylene.

In an exemplary embodiment, in the deuterated anthracene derivative in Formula 2, 1-naphthanlene moiety may be directly connected to anthracene moiety, and 2-naphthalene moiety may be connected to anthracene moiety directly or through a phenylene linker. At least one hydrogen, preferably all hydrogen, of the anthracene derivative is substituted with deuterium.

For example, the boron derivative in Formula 1-1 or 1-2 as the dopant242may be one of the compounds in Formula 3.

For example, the anthracene derivative in Formula 2 as the host244may be one of the compounds in Formula 4.

In the EML240, the dopant242may have a weight % of about 0.1 to 10, preferably 1 to 5, but it is not limited thereto. The EML240may have a thickness of about 100 to 500 Å, preferably 100 to 300 Å, but it is not limited thereto.

In the OLED D of the present disclosure, since the EML240includes the dopant242being the boron derivative and the host244being the deuterated anthracene derivative, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100are improved.

In addition, when the EML240includes the boron derivative as the dopant242having an asymmetric structure as Formula 1-2, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100are further improved.

Moreover, when the EML240includes the boron derivative as the dopant242, in which other aromatic ring and hetero-aromatic ring except a benzene ring being combined to boron atom and two nitrogen atoms are partially or wholly deuterated, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100are further improved.

Furthermore, when the anthracene derivative as the host244includes two naphthalene moieties connected to the anthracene moiety and is partially or wholly deuterated, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100including the anthracene derivative are further improved.

[Synthesis of the Dopant]

1. Synthesis of the Compound 1-1

The compound I1-1c (11.9 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium in heptane (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-1 (2.3 g). (yield 20%)

2. Synthesis of the Compound 1-4

The compound I1-4c (8.6 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-4 (1.9 g). (yield 23%)

3. Synthesis of the Compound 1-6

The compound I1-6c (10.1 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-6 (1.9 g). (yield 21%)

4. Synthesis of the Compound 1-8

The compound I1-8c (9.6 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-8 (2.0 g). (yield 21%)

5. Synthesis of the Compound 1-11

The compound I1-11c (9.8 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-11 (1.4 g). (yield 15%)

6. Synthesis of the Compound 1-12

The compound I1-12c (9.7 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-12 (1.7 g). (yield 18%)

7. Synthesis of the Compound 1-13

The compound I1-13c (9.9 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-13 (1.4 g). (yield 15%)

8. Synthesis of the Compound 1-17

The compound I1-18c (9.7 g, 12.5 mmol) and tert-butylbenzene (60 ml) were added into 500 mL flask. In the temperature of −78° C., n-butyl-lithium (45 mL, 37.5 mmol) was dropwisely added into the mixture, and the mixture was stirred under the temperature of 60° C. for 3 hours. Heptane was removed by blowing nitrogen at 60° C. Boron tribromide (6.3 g, 25 mmol) was dropwisely added at −78° C. The mixture was stirred at room temperature for 1 hour, and N,N-diisopropylethylamine (3.2 g, 25 mmol) was dropwisely added at 0° C. The mixture was stirred at 120° C. for 2 hours. After completion of the reaction, an aqueous sodium acetate solution was added and stirred at room temperature. After extraction with ethyl acetate, the organic layer was concentrated. The mixture was separated by column chromatography to obtain the compound 1-17 (1.6 g). (yield 17%)

[Synthesis of the Host]

1. Synthesis of Compound 2-1

The compound I2-1a (2.0 g, 5.2 mmol), the compound I2-1b (1.5 g, 5.7 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.24 g, 0.26 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-1 (2.3 g) as a white powder. (yield 86%)

2. Synthesis of Compound 2-2

The compound I2-2a (2.0 g, 5.2 mmol), the compound I2-2b (1.5 g, 5.7 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.24 g, 0.26 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-2 (2.0 g) as a white powder. (yield 89%)

3. Synthesis of Compound 2-3

The compound I2-3a (2.0 g, 6.0 mmol), the compound I2-3b (1.9 g, 6.6 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.3 g, 0.3 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-3 (2.0 g) as a white powder. (yield 79%)

4. Synthesis of Compound 2-4

The compound I2-4a (2.0 g, 6.0 mmol), the compound I2-4b (2.4 g, 6.6 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.3 g, 0.3 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-4 (2.0 g) as a white powder. (yield 67%)

5. Synthesis of Compound 2-5

The compound I2-5a (2.0 g, 5.2 mmol), the compound I2-5b (2.0 g, 5.7 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.24 g, 0.26 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-5 (2.0 g) as a white powder. (yield 81%)

6. Synthesis of Compound 2-6

The compound I2-6a (2.0 g, 5.2 mmol), the compound I2-6b (2.0 g, 5.7 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.24 g, 0.26 mmol), and toluene (50 mL) were added into a 250 mL reactor in a dry box. After the reactor is removed from the dry box, and sodium carbonate anhydrous (2M, 20 mL) was added int the mixture. The reactant was stirred and heated at 90° C. overnight. The reaction was monitored by high-performance liquid chromatography (HPLC). After the mixture was cooled to room temperature, the organic layer was separated from the mixture. The aqueous layer was washed with dichloromethane, and the organic layer was concentrated by rotary evaporation to obtain a gray powder. The gray powder was subjected to purification using alumina, precipitation using hexane, and column chromatography using silica gel to obtain the compound 2-6 (2.0 g) as a white powder. (yield 81%)

7. Synthesis of Compound 2-7

Under nitrogen condition, aluminum chloride (0.5 g, 3.6 mmol) was added into perdeuterobenzene solution (100 mL), where the compound 2-1 (5.0 g, 9.9 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (50 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (30 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-7 (4.5 g) as a white powder. (yield 85%)

8. Synthesis of Compound 2-8

Under nitrogen condition, aluminum chloride (0.9 g, 4.3 mmol) was added into perdeuterobenzene solution (120 mL), where the compound 2-2 (5.0 g, 11.6 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (70 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (50 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-8 (4.0 g) as a white powder. (yield 76%)

9. Synthesis of Compound 2-9

Under nitrogen condition, aluminum chloride (0.9 g, 4.3 mmol) was added into perdeuterobenzene solution (120 mL), where the compound 2-3 (5.0 g, 11.9 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (70 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (50 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-9 (3.0 g) as a white powder. (yield 57%)

10. Synthesis of Compound 2-10

Under nitrogen condition, aluminum chloride (0.9 g, 4.3 mmol) was added into perdeuterobenzene solution (120 mL), where the compound 2-4 (5.0 g, 10.1 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (70 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (50 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-10 (3.5 g) as a white powder. (yield 67%)

11. Synthesis of Compound 2-11

Under nitrogen condition, aluminum chloride (0.9 g, 4.3 mmol) was added into perdeuterobenzene solution (120 mL), where the compound 2-5 (5.0 g, 10.6 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (70 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (50 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-11 (4.0 g) as a white powder. (yield 77%)

12. Synthesis of Compound 2-12

Under nitrogen condition, aluminum chloride (0.9 g, 4.3 mmol) was added into perdeuterobenzene solution (120 mL), where the compound 2-6 (5.0 g, 10.6 mmol) was dissolved. After the product by the mixture was stirred at room temperature for 6 hours, D2O (70 mL) was added. After the organic layer was separated, the aqueous layer was washed with dichloromethane (50 mL). The obtained organic layer was dried using magnesium sulfate, and volatiles were removed by rotary evaporation. Thereafter, the crude product was purified through column chromatography to obtain the compound 2-12 (4.3 g) as a white powder. (yield 82%)

1. COMPARATIVE EXAMPLES

The compound 2-1 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-2 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-3 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-5 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-6 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-7 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-8 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-9 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-10 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-11 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The compound 2-12 in Formula 4 is used as the host, and the compounds 1-1, 1-4, 1-6, 1-8, 1-11, 1-12, 1-13 and 1-17 in Formula 3 are respectively used as the dopant to form the EML.

The properties, i.e., the driving voltage (V), the external quantum efficiency (EQE), the color coordinate (CIE) and the lifespan (T95), of the OLEDs manufactured in Comparative Examples 1 to 48 and Examples 1 to 48 are measured and listed in Tables 1 to 6.

As shown in Tables 1 to 6, in comparison to the OLEDs of Ref1 to Ref48, each of which includes a non-deuterated anthracene derivative, e.g., the compounds 2-1 to 2-6, as a host, the emitting efficiency and the lifespan of the OLEDs of Ex1 to Ex48, each of which includes a deuterated anthracene derivative, e.g., the compounds 2-7 to 2-12, as a host are significantly improved.

In addition, in comparison to the OLEDs of Ex17 to Ex48, the emitting efficiency and the lifespan of the OLEDs of Ex1 to Ex8, each of which includes the compound 2-7 as a host, and the OLEDs of Ex9 to Ex16, each of which includes the compound 2-8 as a host, are increased. Namely, when the anthracene derivative, in which one naphthalene moiety, i.e., 1-naphthyl, is directly connected to one side of the anthracene moiety and another naphthalene moiety, i.e., 2-naphthyl, is connected to the other side of the anthracene moiety directly or through a linker, being deuterated is included as a host, the emitting efficiency and the lifespan of the OLED are increased.

In comparison to the OLEDs of Ex1 to Ex8, each of which includes the compound 2-7 as a host, the OLEDs of Ex9 to Ex16, each of which includes the compound 2-8, provides sufficient lifespan. On the other hand, in the OLEDs of Ex1 to Ex8, each of which includes the compound 2-7, the driving voltage is significantly decreased and the emitting efficiency is significantly increased with sufficient lifespan. Namely, when the anthracene derivative, in which one naphthalene moiety, i.e., 1-naphthyl, is directly connected to one side of the anthracene moiety and another naphthalene moiety, i.e., 2-naphthyl, is connected to the other side of the anthracene moiety directly or through a linker, being deuterated is included as a host, the OLED has advantages in all of the driving voltage, the emitting efficiency and the lifespan.

In addition, in comparison to the OLEDs, which includes the boron derivative, e.g., the compound 1-1 or 1-4, having the symmetric structure, the emitting efficiency and the lifespan of the OLED, which includes the boron derivative, e.g., the compound 1-6 or 1-8, having the asymmetric structure, are improved.

Moreover, in the OLED, which includes the boron derivative, e.g., the compound 1-11, 1-12, 1-13 or 1-17, having the asymmetric structure and being deuterated, the emitting efficiency and the lifespan are further improved.

Furthermore, when each of the HIL and the HTL includes the compound in Formula 5 and the EBL includes the compound in Formula 7, the properties of the OLED are improved.

FIG. 4is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting parts according to the first embodiment of the present disclosure.

As shown inFIG. 4, the OLED D includes the first and second electrodes160and164facing each other and the organic emitting layer162between the first and second electrodes160and164. The organic emitting layer162includes a first emitting part310including a first EML320, a second emitting part330including a second EML340and a charge generation layer (CGL)350between the first and second emitting parts310and330. The organic light emitting display device100(ofFIG. 2) includes red, green and blue pixels, and the OLED D may be positioned in the blue pixel.

One of the first and second electrodes160and164is an anode, and the other one of the first and second electrodes160and164is a cathode. One of the first and second electrodes160and164is a transparent electrode (or a semi-transparent electrode) electrode, and the other one of the first and second electrodes160and164is a reflection electrode.

The CGL350is positioned between the first and second emitting parts310and330, and the first emitting part310, the CGL350and the second emitting part330are sequentially stacked on the first electrode160. Namely, the first emitting part310is positioned between the first electrode160and the CGL350, and the second emitting part330is positioned between the second electrode164and the CGL350.

The first emitting part310includes a first EML320. In addition, the first emitting part310may further include a first EBL316between the first electrode160and the first EML320and a first HBL318between the first EML320and the CGL350.

In addition, the first emitting part310may further include a first HTL314between the first electrode160and the first EBL316and an HIL312between the first electrode160and the first HTL314.

The first EML320includes a dopant322of the boron derivative and a host324of the deuterated anthracene derivative and emits blue light. Namely, at least one of hydrogens in the anthracene derivative is substituted with deuterium. The boron derivative is not deuterated, or a part of hydrogens in the boron derivative is substituted with deuterium. The dopant322may be represented by Formula 1-1 or 1-2 and may be one of the compounds in Formula 3. The host324may be represented by Formula 2 and may be one of the compounds in Formula 4.

In the first EML320, the host324may have a weight % of about 70 to 99.9, and the dopant322may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the dopant322may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The second emitting part330includes the second EML340. In addition, the second emitting part330may further include a second EBL334between the CGL350and the second EML340and a second HBL336between the second EML340and the second electrode164.

In addition, the second emitting part330may further include a second HTL332between the CGL350and the second EBL334and an EIL338between the second HBL336and the second electrode164.

The second EML340includes a dopant342of the boron derivative and a host344of the deuterated anthracene derivative and emits blue light. Namely, at least one of hydrogens in the anthracene derivative is substituted with deuterium. The boron derivative is not deuterated, or a part of hydrogens in the boron derivative is substituted with deuterium.

In the second EML340, the host344may have a weight % of about 70 to 99.9, and the dopant342may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the dopant342may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The host344of the second EML340may be same as or different from the host324of the first EML320, and the dopant342of the second EML340may be same as or different from the dopant322of the first EML320.

The CGL350is positioned between the first and second emitting parts310and330. Namely, the first and second emitting parts310and330are connected through the CGL350. The CGL350may be a P-N junction CGL of an N-type CGL352and a P-type CGL354.

The N-type CGL352is positioned between the first HBL318and the second HTL332, and the P-type CGL354is positioned between the N-type CGL352and the second HTL332.

In the OLED D, each of the first and second EMLs320and340includes the dopant322and342, each of which is the boron derivative and the host324and344, each of which is the deuterated anthracene derivative. As a result, the OLED D and the organic light emitting display device100have advantages in the emitting efficiency and the lifespan.

In addition, when the boron derivative as the dopant322and342, in which other aromatic ring and hetero-aromatic ring except a benzene ring being combined to boron atom and two nitrogen atoms are partially or wholly deuterated, is included, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100are further improved.

Moreover, when the anthracene derivative as the host324and344includes two naphthalene moieties connected to the anthracene moiety and is partially or wholly deuterated, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device100including the anthracene derivative are further improved.

Furthermore, since the first and second emitting parts310and330for emitting blue light are stacked, the organic light emitting display device100provides an image having high color temperature.

FIG. 5is a schematic cross-sectional view illustrating an organic light emitting display device according to a second embodiment of the present disclosure, andFIG. 6is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting parts according to the second embodiment of the present disclosure.FIG. 7is a schematic cross-sectional view illustrating an OLED having a tandem structure of three emitting parts according to the second embodiment of the present disclosure.

As shown inFIG. 5, the organic light emitting display device400includes a first substrate410, where a red pixel RP, a green pixel GP and a blue pixel BP are defined, a second substrate470facing the first substrate410, an OLED D, which is positioned between the first and second substrates410and470and providing white emission, and a color filter layer480between the OLED D and the second substrate470.

Each of the first and second substrates410and470may be a glass substrate or a flexible substrate. For example, the flexible substrate may be one of a polyimide (PI) substrate, polyethersulfone (PES), polyethylenenaphthalate (PEN), polyethylene terephthalate (PET) and polycarbonate (PC).

A buffer layer420is formed on the first substrate, and the TFT Tr corresponding to each of the red, green and blue pixels RP, GP and BP is formed on the buffer layer420. The buffer layer420may be omitted.

A semiconductor layer422is formed on the buffer layer420. The semiconductor layer422may include an oxide semiconductor material or polycrystalline silicon.

A gate insulating layer424is formed on the semiconductor layer422. The gate insulating layer424may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode430, which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer424to correspond to a center of the semiconductor layer422.

An interlayer insulating layer432, which is formed of an insulating material, is formed on the gate electrode430. The interlayer insulating layer432may be formed of an inorganic insulating material, e.g., silicon oxide or silicon nitride, or an organic insulating material, e.g., benzocyclobutene or photo-acryl.

The interlayer insulating layer432includes first and second contact holes434and436exposing both sides of the semiconductor layer422. The first and second contact holes434and436are positioned at both sides of the gate electrode430to be spaced apart from the gate electrode430.

A source electrode440and a drain electrode442, which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer432.

The source electrode440and the drain electrode442are spaced apart from each other with respect to the gate electrode430and respectively contact both sides of the semiconductor layer422through the first and second contact holes434and436.

The semiconductor layer422, the gate electrode430, the source electrode440and the drain electrode442constitute the TFT Tr. The TFT Tr serves as a driving element. Namely, the TFT Tr may correspond to the driving TFT Td (ofFIG. 1).

Although not shown, the gate line and the data line cross each other to define the pixel, and the switching TFT is formed to be connected to the gate and data lines. The switching TFT is connected to the TFT Tr as the driving element.

In addition, the power line, which may be formed to be parallel to and spaced apart from one of the gate and data lines, and the storage capacitor for maintaining the voltage of the gate electrode of the TFT Tr in one frame may be further formed.

A passivation layer (or a planarization layer)450, which includes a drain contact hole452exposing the drain electrode442of the TFT Tr, is formed to cover the TFT Tr.

A first electrode460, which is connected to the drain electrode442of the TFT Tr through the drain contact hole452, is separately formed in each pixel and on the passivation layer450. The first electrode460may be an anode and may be formed of a conductive material, e.g., a transparent conductive oxide (TCO), having a relatively high work function. For example, the first electrode460may be formed of indium-tin-oxide (ITO), indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper-oxide (ICO) or aluminum-zinc-oxide (Al:ZnO, AZO).

When the organic light emitting display device400is operated in a bottom-emission type, the first electrode460may have a single-layered structure of the transparent conductive oxide. When the organic light emitting display device400is operated in a top-emission type, a reflection electrode or a reflection layer may be formed under the first electrode460. For example, the reflection electrode or the reflection layer may be formed of silver (Ag) or aluminum-palladium-copper (APC) alloy. In this instance, the first electrode460may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO.

A bank layer466is formed on the passivation layer450to cover an edge of the first electrode460. Namely, the bank layer466is positioned at a boundary of the pixel and exposes a center of the first electrode460in the pixel. Since the OLED D emits the white light in the red, green and blue pixels RP, GP and BP, the organic emitting layer462may be formed as a common layer in the red, green and blue pixels RP, GP and BP without separation. The bank layer466may be formed to prevent a current leakage at an edge of the first electrode460and may be omitted.

An organic emitting layer462is formed on the first electrode460.

Referring toFIG. 6, the OLED D includes the first and second electrodes460and464facing each other and the organic emitting layer462between the first and second electrodes460and464. The organic emitting layer462includes a first emitting part710including a first EML720, a second emitting part730including a second EML740and a charge generation layer (CGL)750between the first and second emitting parts710and730.

The CGL750is positioned between the first and second emitting parts710and730, and the first emitting part710, the CGL750and the second emitting part730are sequentially stacked on the first electrode460. Namely, the first emitting part710is positioned between the first electrode460and the CGL750, and the second emitting part730is positioned between the second electrode464and the CGL750.

The first emitting part710includes a first EML720. In addition, the first emitting part710may further include a first EBL716between the first electrode460and the first EML720and a first HBL718between the first EML720and the CGL750.

In addition, the first emitting part710may further include a first HTL714between the first electrode460and the first EBL716and an HIL712between the first electrode460and the first HTL714.

The first EML720includes a dopant722of the boron derivative and a host724of the deuterated anthracene derivative and emits blue light. Namely, at least one of hydrogens in the anthracene derivative is substituted with deuterium. The boron derivative is not deuterated, or a part of hydrogens in the boron derivative is substituted with deuterium. The dopant722may be represented by Formula 1-1 or 1-2 and may be one of the compounds in Formula 3. The host724may be represented by Formula 2 and may be one of the compounds in Formula 4.

In the first EML720, the host724may have a weight % of about 70 to 99.9, and the dopant722may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the dopant722may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The second emitting part730includes the second EML740. In addition, the second emitting part730may further include a second EBL734between the CGL750and the second EML740and a second HBL736between the second EML740and the second electrode464.

In addition, the second emitting part730may further include a second HTL732between the CGL750and the second EBL734and an EIL738between the second HBL736and the second electrode464.

The second EML740may be a yellow-green EML. For example, the second EML740may include a yellow-green dopant743and a host745. The yellow-green dopant743may be one of a fluorescent compound, a phosphorescent compound and a delayed fluorescent compound.

In the second EML740, the host745may have a weight % of about 70 to 99.9, and the yellow-green dopant743may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the yellow-green dopant743may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The CGL750is positioned between the first and second emitting parts710and730. Namely, the first and second emitting parts710and730are connected through the CGL750. The CGL750may be a P-N junction CGL of an N-type CGL752and a P-type CGL754.

The N-type CGL752is positioned between the first HBL718and the second HTL732, and the P-type CGL754is positioned between the N-type CGL752and the second HTL732.

InFIG. 6, the first EML720, which is positioned between the first electrode460and the CGL750, includes the host722of the anthracene derivative and the dopant724of the boron derivative, and the second EML740, which is positioned between the second electrode464and the CGL750, is the yellow-green EML. Alternatively, the first EML720, which is positioned between the first electrode460and the CGL750, may be the yellow-green EML, and the second EML740, which is positioned between the second electrode464and the CGL750, may include the host of the anthracene derivative and the dopant of the boron derivative to be a blue EML.

In the OLED D, the first EML720includes the dopant722, each of which is the boron derivative, and the host724, each of which is the deuterated anthracene derivative. As a result, the OLED D and the organic light emitting display device400have advantages in the emitting efficiency and the lifespan.

When the boron derivative as the dopant722has an asymmetric structure as Formula 1-2, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400are further improved.

In addition, when the boron derivative as the dopant722, in which other aromatic ring and hetero-aromatic ring except a benzene ring being combined to boron atom and two nitrogen atoms are partially or wholly deuterated, is included, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400are further improved.

Moreover, when the anthracene derivative as the host724includes two naphthalene moieties connected to the anthracene moiety and is partially or wholly deuterated, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400including the anthracene derivative are further improved.

The OLED D including the first emitting part710and the second emitting part730, which provides a yellow-green emission, emits a white light.

Referring toFIG. 7, the organic emitting layer462includes a first emitting part530including a first EML520, a second emitting part550including a second EML540, a third emitting part570including a third EML560, a first CGL580between the first and second emitting parts530and550and a second CGL590between the second and third emitting parts550and570.

The first CGL580is positioned between the first and second emitting parts530and550, and the second CGL590is positioned between the second and third emitting parts550and570. Namely, the first emitting part530, the first CGL580, the second emitting part550, the second CGL590and the third emitting part570are sequentially stacked on the first electrode460. In other words, the first emitting part530is positioned between the first electrode460and the first CGL580, the second emitting part550is positioned between the first and second CGLs580and590, and the third emitting part570is positioned between the second electrode464and the second CGL590.

The first emitting part530may include an HIL532, a first HTL534, a first EBL536, the first EML520and a first HBL538sequentially stacked on the first electrode460. Namely, the HIL532, the first HTL534and the first EBL536are positioned between the first electrode460and the first EML520, and the first HBL538is positioned between the first EML520and the first CGL580.

The first EML520includes a dopant522of the boron derivative and a host524of the deuterated anthracene derivative and emits blue light. Namely, at least one of hydrogens in the anthracene derivative is substituted with deuterium. The boron derivative is not deuterated, or a part of hydrogens in the boron derivative is substituted with deuterium. The dopant522may be represented by Formula 1-1 or 1-2 and may be one of the compounds in Formula 3. The host524may be represented by Formula 2 and may be one of the compounds in Formula 4.

In the first EML520, the host524may have a weight % of about 70 to 99.9, and the dopant522may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the dopant522may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The second emitting part550may include a second HTL552, the second EML540and an electron transporting layer (ETL)554. The second HTL552is positioned between the first CGL580and the second EML540, and the ETL554is positioned between the second EML540and the second CGL590.

The second EML540may be a yellow-green EML. For example, the second EML540may include a host and a yellow-green dopant.

Alternatively, the second EML540may include a host, a red dopant and a green dopant. In this instance, the second EML540may have a single-layered structure, or may have a double-layered structure of a lower layer including the host and the red dopant (or the green dopant) and an upper layer including the host and the green dopant (or the red dopant).

The second EML540may have a triple-layered structure of a first layer, which includes a host and a red dopant, a second layer, which includes a host and a yellow-green dopant, and a third layer, which includes a host and a green dopant.

The third emitting part570may include a third HTL572, a second EBL574, the third EML560, a second HBL576and an EIL578.

The third EML560includes a dopant562of the boron derivative and a host564of the deuterated anthracene derivative and emits blue light. Namely, at least one of hydrogens in the anthracene derivative is substituted with deuterium. The boron derivative is not deuterated, or a part of hydrogens in the boron derivative is substituted with deuterium. The dopant562may be represented by Formula 1-1 or 1-2 and may be one of the compounds in Formula 3. The host564may be represented by Formula 2 and may be one of the compounds in Formula 4.

In the third EML560, the host564may have a weight % of about 70 to 99.9, and the dopant562may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the dopant562may have a weight % of about 0.1 to 10, preferably about 1 to 5.

The host564of the third EML560may be same as or different from the host524of the first EML520, and the dopant562of the third EML560may be same as or different from the dopant522of the first EML520.

The first CGL580is positioned between the first emitting part530and the second emitting part550, and the second CGL590is positioned between the second emitting part550and the third emitting part570. Namely, the first and second emitting parts530and550are connected through the first CGL580, and the second and third emitting parts550and570are connected through the second CGL590. The first CGL580may be a P-N junction CGL of a first N-type CGL582and a first P-type CGL584, and the second CGL590may be a P-N junction CGL of a second N-type CGL592and a second P-type CGL594.

In the first CGL580, the first N-type CGL582is positioned between the first HBL538and the second HTL552, and the first P-type CGL584is positioned between the first N-type CGL582and the second HTL552.

In the second CGL590, the second N-type CGL592is positioned between the ETL554and the third HTL572, and the second P-type CGL594is positioned between the second N-type CGL592and the third HTL572.

In the OLED D, each of the first and third EMLs520and560includes the dopant522and562, each of which is the boron derivative and the host524and564, each of which is the deuterated anthracene derivative. As a result, the OLED D and the organic light emitting display device400have advantages in the emitting efficiency and the lifespan.

When the boron derivative as the dopant522and562has an asymmetric structure as Formula 1-2, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400are further improved.

In addition, when the boron derivative as the dopant522and562, in which other aromatic ring and hetero-aromatic ring except a benzene ring being combined to boron atom and two nitrogen atoms are partially or wholly deuterated, is included, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400are further improved.

Moreover, when the anthracene derivative as the host524and564includes two naphthalene moieties connected to the anthracene moiety and is partially or wholly deuterated, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device400including the anthracene derivative are further improved.

Accordingly, the OLED D including the first and third emitting parts530and570with the second emitting part550, which emits yellow-green light or red-green light, can emit white light.

InFIG. 7, the OLED D has a triple-stack structure of the first, second and third emitting parts530,550and570. Alternatively, the OLED D may further include additional emitting part and CGL.

Referring toFIG. 5again, a second electrode464is formed over the substrate410where the organic emitting layer462is formed.

In the organic light emitting display device400, since the light emitted from the organic emitting layer462is incident to the color filter layer480through the second electrode464, the second electrode464has a thin profile for transmitting the light.

The first electrode460, the organic emitting layer462and the second electrode464constitute the OLED D.

The color filter layer480is positioned over the OLED D and includes a red color filter482, a green color filter484and a blue color filter486respectively corresponding to the red, green and blue pixels RP, GP and BP. The red color filter482may include at least one of red dye and red pigment, the green color filter484may include at least one of green dye and green pigment, and the blue color filter486may include at least one of blue dye and blue pigment.

Although not shown, the color filter layer480may be attached to the OLED D by using an adhesive layer. Alternatively, the color filter layer480may be formed directly on the OLED D.

An encapsulation film (not shown) may be formed to prevent penetration of moisture into the OLED D. For example, the encapsulation film may include a first inorganic insulating layer, an organic insulating layer and a second inorganic insulating layer sequentially stacked, but it is not limited thereto. The encapsulation film may be omitted.

A polarization plate (not shown) for reducing an ambient light reflection may be disposed over the top-emission type OLED D. For example, the polarization plate may be a circular polarization plate.

In the OLED ofFIG. 5, the first and second electrodes460and464are a reflection electrode and a transparent (or semi-transparent) electrode, respectively, and the color filter layer480is disposed over the OLED D. Alternatively, when the first and second electrodes460and464are a transparent (or semi-transparent) electrode and a reflection electrode, respectively, the color filter layer480may be disposed between the OLED D and the first substrate410.

A color conversion layer (not shown) may be formed between the OLED D and the color filter layer480. The color conversion layer may include a red color conversion layer, a green color conversion layer and a blue color conversion layer respectively corresponding to the red, green and blue pixels RP, GP and BP. The white light from the OLED D is converted into the red light, the green light and the blue light by the red, green and blue color conversion layer, respectively. For example, the color conversion layer may include a quantum dot. Accordingly, the color purity of the organic light emitting display device400may be further improved.

The color conversion layer may be included instead of the color filter layer480.

As described above, in the organic light emitting display device400, the OLED D in the red, green and blue pixels RP, GP and BP emits the white light, and the white light from the organic light emitting diode D passes through the red color filter482, the green color filter484and the blue color filter486. As a result, the red light, the green light and the blue light are provided from the red pixel RP, the green pixel GP and the blue pixel BP, respectively.

InFIGS. 5 to 7, the OLED D emitting the white light is used for a display device. Alternatively, the OLED D may be formed on an entire surface of a substrate without at least one of the driving element and the color filter layer to be used for a lightening device. The display device and the lightening device each including the OLED D of the present disclosure may be referred to as an organic light emitting device.

FIG. 8is a schematic cross-sectional view illustrating an organic light emitting display device according to a third embodiment of the present disclosure.

As shown inFIG. 8, the organic light emitting display device600includes a first substrate610, where a red pixel RP, a green pixel GP and a blue pixel BP are defined, a second substrate670facing the first substrate610, an OLED D, which is positioned between the first and second substrates610and670and providing white emission, and a color conversion layer680between the OLED D and the second substrate670.

Although not shown, a color filter may be formed between the second substrate670and each color conversion layer680.

Each of the first and second substrates610and670may be a glass substrate or a flexible substrate. For example, the flexible substrate may be one of a polyimide (PI) substrate, polyethersulfone (PES), polyethylenenaphthalate (PEN), polyethylene terephthalate (PET) and polycarbonate (PC).

A TFT Tr, which corresponding to each of the red, green and blue pixels RP, GP and BP, is formed on the first substrate610, and a passivation layer650, which has a drain contact hole652exposing an electrode, e.g., a drain electrode, of the TFT Tr is formed to cover the TFT Tr.

The OLED D including a first electrode660, an organic emitting layer662and a second electrode664is formed on the passivation layer650. In this instance, the first electrode660may be connected to the drain electrode of the TFT Tr through the drain contact hole652.

A bank layer666is formed on the passivation layer650to cover an edge of the first electrode660. Namely, the bank layer666is positioned at a boundary of the pixel and exposes a center of the first electrode660in the pixel. Since the OLED D emits the blue light in the red, green and blue pixels RP, GP and BP, the organic emitting layer662may be formed as a common layer in the red, green and blue pixels RP, GP and BP without separation. The bank layer666may be formed to prevent a current leakage at an edge of the first electrode660and may be omitted.

The OLED D emits a blue light and may have a structure shown inFIG. 3orFIG. 4. Namely, the OLED D is formed in each of the red, green and blue pixels RP, GP and BP and provides the blue light.

The color conversion layer680includes a first color conversion layer682corresponding to the red pixel RP and a second color conversion layer684corresponding to the green pixel GP. For example, the color conversion layer680may include an inorganic color conversion material such as a quantum dot. The color conversion layer680is not presented in the blue pixel BP such that the OLED D in the blue pixel may directly face the second electrode670.

The blue light from the OLED D is converted into the red light by the first color conversion layer682in the red pixel RP, and the blue light from the OLED D is converted into the green light by the second color conversion layer684in the green pixel GP.

Accordingly, the organic light emitting display device600can display a full-color image.

On the other hand, when the light from the OLED D passes through the first substrate610, the color conversion layer680is disposed between the OLED D and the first substrate610.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present disclosure without departing from the spirit or scope of the present disclosure. Thus, it is intended that the modifications and variations cover this disclosure provided they come within the scope of the appended claims and their equivalents.