Patent Description:
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 fist 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.

An organic electroluminescent element suitable for use in the blue pixel region is, for example, known from <CIT>.

However, known OLEDs for the blue pixel do 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.

Accordingly, 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 due to the limitations and disadvantages of the related art.

An object of the present disclosure is to provide an OLED having enhanced emitting efficiency and lifespan and an organic light emitting device including the same.

Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure. The objectives and other advantages of the disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

According to an aspect, the present disclosure provides an OLED that includes a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first host, a second host and a blue dopant and positioned between the first and second electrodes; a first electron blocking layer including an electron blocking material of an amine derivative and positioned between the first electrode and the first emitting material layer; and a first hole blocking layer including at least one of a first hole blocking material and a second hole blocking material and positioned between the second electrode and the first emitting material layer, wherein the first host is a non-deuterated anthracene derivative, and the second host is a deuterated anthracene derivative, and wherein the first hole blocking material is an azine derivative, and the second hole blocking material is a benzimidazole derivative, wherein the first hole blocking material is represented by the following Formula:
<CHM>
, wherein each of Y<NUM> to Y<NUM> are independently CR<NUM> or N, and one to three of Y<NUM> to Y<NUM> is N, wherein R<NUM> is independently hydrogen or C<NUM>~C<NUM> aryl group, wherein L is C<NUM>∼C<NUM> arylene group, and R<NUM> is C<NUM>~C<NUM> aryl group or C<NUM>~C<NUM> hetero aryl group, wherein R<NUM> is hydrogen, or adjacent two of R3 form a fused ring, and wherein "a" is <NUM> or <NUM>, "b" is <NUM> or <NUM>, and "c" is an integer of <NUM> to <NUM>.

In the first emitting material layer, a weight % ratio of the first host to the second host is <NUM>:<NUM> to <NUM>:<NUM>.

As an example, in the first emitting material layer, the weight % ratio of the first host to the second host is <NUM>:<NUM> to <NUM>:<NUM>.

As an example, in the first emitting material layer, the weight % ratio of the first host to the second host is <NUM>:<NUM>.

The OLED may include a single emitting part or a tandem structure of a multiple emitting parts.

The tandem-structured OLED may emit blue color or white color.

According to another aspect, the present disclosure provides an organic light emitting device comprising the OLED, as described above.

For example, the organic light emitting device may be an organic light emitting display device or a lightening device.

It is to be understood that both the foregoing general description and the following detailed description are examples and are explanatory and are intended to provide further explanation of the disclosure as claimed.

An emitting material layer of an OLED of the present disclosure includes a first host of an anthracene derivative and a second host of a deuterated anthracene derivative such that an emitting efficiency and a lifespan of the OLED and an organic light emitting device including the OLED are improved.

In addition, an electron blocking layer of an OLED of the present disclosure includes an amine derivative as an electron blocking material, and a hole blocking layer of the OLED includes at least one of an azine derivative and a benzimidazole derivative as a hole blocking material. Accordingly, the lifespan of the OLED and an organic light emitting device is further improved.

The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this specification, illustrate implementations of the disclosure and together with the description serve to explain the principles of embodiments of the disclosure.

Reference will now be made in detail to aspects of the disclosure, examples of which are illustrated in the accompanying drawings.

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

As illustrated in <FIG>, 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 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 region P. The pixel region 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 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 Tr. 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> is a schematic cross-sectional view illustrating an organic light emitting display device according to a first embodiment of the present disclosure.

As illustrated in <FIG>, the organic light emitting display device <NUM> includes a substrate <NUM>, a TFT Tr and an OLED D connected to the TFT Tr. For example, the organic light emitting display device <NUM> may 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 substrate <NUM> may be a glass substrate or a plastic substrate. For example, the substrate <NUM> may be a polyimide substrate.

A buffer layer <NUM> is formed on the substrate, and the TFT Tr is formed on the buffer layer <NUM>. The buffer layer <NUM> may be omitted.

A semiconductor layer <NUM> is formed on the buffer layer <NUM>. The semiconductor layer <NUM> may include an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer <NUM> includes the oxide semiconductor material, a light-shielding pattern (not shown) may be formed under the semiconductor layer <NUM>. The light to the semiconductor layer <NUM> is shielded or blocked by the light-shielding pattern such that thermal degradation of the semiconductor layer <NUM> can be prevented. On the other hand, when the semiconductor layer <NUM> includes polycrystalline silicon, impurities may be doped into both sides of the semiconductor layer <NUM>.

A gate insulating layer <NUM> is formed on the semiconductor layer <NUM>. The gate insulating layer <NUM> may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode <NUM>, which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer <NUM> to correspond to a center of the semiconductor layer <NUM>.

In <FIG>, the gate insulating layer <NUM> is formed on an entire surface of the substrate <NUM>. Alternatively, the gate insulating layer <NUM> may be patterned to have the same shape as the gate electrode <NUM>.

An interlayer insulating layer <NUM>, which is formed of an insulating material, is formed on the gate electrode <NUM>. The interlayer insulating layer <NUM> may 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 layer <NUM> includes first and second contact holes <NUM> and <NUM> exposing both sides of the semiconductor layer <NUM>. The first and second contact holes <NUM> and <NUM> are positioned at both sides of the gate electrode <NUM> to be spaced apart from the gate electrode <NUM>.

The first and second contact holes <NUM> and <NUM> are formed through the gate insulating layer <NUM>. Alternatively, when the gate insulating layer <NUM> is patterned to have the same shape as the gate electrode <NUM>, the first and second contact holes <NUM> and <NUM> is formed only through the interlayer insulating layer <NUM>.

A source electrode <NUM> and a drain electrode <NUM>, which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer <NUM>.

The source electrode <NUM> and the drain electrode <NUM> are spaced apart from each other with respect to the gate electrode <NUM> and respectively contact both sides of the semiconductor layer <NUM> through the first and second contact holes <NUM> and <NUM>.

The semiconductor layer <NUM>, the gate electrode <NUM>, the source electrode <NUM> and the drain electrode <NUM> constitute the TFT Tr. The TFT Tr serves as a driving element. Namely, the TFT Tr may correspond to the driving TFT Td (of <FIG>).

In the TFT Tr, the gate electrode <NUM>, the source electrode <NUM>, and the drain electrode <NUM> are positioned over the semiconductor layer <NUM>. 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 <NUM>, which includes a drain contact hole <NUM> exposing the drain electrode <NUM> of the TFT Tr, is formed to cover the TFT Tr.

A first electrode <NUM>, which is connected to the drain electrode <NUM> of the TFT Tr through the drain contact hole <NUM>, is separately formed in each pixel. The first electrode <NUM> may be an anode and may be formed of a conductive material having a relatively high work function. For example, the first electrode <NUM> may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

When the OLED device <NUM> is operated in a top-emission type, a reflection electrode or a reflection layer may be formed under the first electrode <NUM>. For example, the reflection electrode or the reflection layer may be formed of aluminum-palladium-copper (APC) alloy.

A bank layer <NUM> is formed on the passivation layer <NUM> to cover an edge of the first electrode <NUM>. Namely, the bank layer <NUM> is positioned at a boundary of the pixel and exposes a center of the first electrode <NUM> in the pixel.

An organic emitting layer <NUM> is formed on the first electrode <NUM>. The organic emitting layer <NUM> may 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 device <NUM>, the organic emitting layer <NUM> may have a multi-layered structure. For example, the organic emitting layer <NUM> may include the EML, an electron blocking layer (EBL) between the first electrode <NUM> and the EML, and a hole blocking layer (HBL) between the EML and the second electrode <NUM>.

The organic emitting layer <NUM> is separated in each of the red, green and blue pixels. As illustrated below, the organic emitting layer <NUM> in the blue pixel includes a first host of an anthracene derivative (compound) and a second host of a deuterated anthracene derivative such that the emitting efficiency and the lifespan of the OLED D in the blue pixel are improved.

In addition, the EBL includes an amine derivative as an electron blocking material, and the HBL includes at least one of an azine derivative and a benzimidazole derivative as a hole blocking material. Accordingly, the lifespan of the OLED D and an organic light emitting device <NUM> is further improved.

A second electrode <NUM> is formed over the substrate <NUM> where the organic emitting layer <NUM> is formed. The second electrode <NUM> covers 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 electrode <NUM> may be formed of aluminum (Al), magnesium (Mg) or Al-Mg alloy.

The first electrode <NUM>, the organic emitting layer <NUM> and the second electrode <NUM> constitute the OLED D.

An encapsulation film <NUM> is formed on the second electrode <NUM> to prevent penetration of moisture into the OLED D. The encapsulation film <NUM> includes a first inorganic insulating layer <NUM>, an organic insulating layer <NUM> and a second inorganic insulating layer <NUM> sequentially stacked, but it is not limited thereto. The encapsulation film <NUM> 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 addition, a cover window (not shown) may be attached to the encapsulation film <NUM> or the polarization plate. In this instance, the substrate <NUM> and the cover window have a flexible property such that a flexible display device may be provided.

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

As illustrated in <FIG>, the OLED D includes the first and second electrodes <NUM> and <NUM>, which face each other, and the organic emitting layer <NUM> therebetween. The organic emitting layer <NUM> includes an EML <NUM> between the first and second electrodes <NUM> and <NUM>, an EBL <NUM> between the first electrode <NUM> and the EML <NUM>, and an HBL <NUM> between the EML <NUM> and the second electrode <NUM>.

The first electrode <NUM> may be formed of a conductive material having a relatively high work function to serve as an anode. The second electrode <NUM> may be formed of a conductive material having a relatively low work function to serve as a cathode.

The organic emitting layer <NUM> may further include a hole transporting layer (HTL) <NUM> between the first electrode <NUM> and the EBL <NUM>.

Moreover, the organic emitting layer <NUM> may further include a hole injection layer (HIL) <NUM> between the first electrode <NUM> and the HTL <NUM> and an electron injection layer (EIL) <NUM> between the second electrode <NUM> and the HBL <NUM>.

The EML <NUM> includes a first host <NUM> of an anthracene derivative, a second host <NUM> of a deuterated anthracene derivative and a blue dopant (not shown) and provides blue emission.

The compound of the first host <NUM> may be represented by Formula <NUM>:.

In Formula <NUM>, each of R <NUM> and R <NUM> is independently C <NUM>∼C <NUM> aryl group or C <NUM>~C <NUM> heteroaryl group, and each of L <NUM> and L <NUM> is independently C <NUM>∼C <NUM> arylene group. Each of a and b is an integer of <NUM> or <NUM>, and at least one of a and b is <NUM>.

For example, R <NUM> may be phenyl or naphthyl, R <NUM> may be naphthyl, dibenzofuranyl or fused dibenzofuranyl. Each of L <NUM> and L <NUM> may independently be phenylene.

In an exemplary embodiment, the first host <NUM> may be a compound being one of the followings in Formula <NUM>:
<CHM>
<CHM>.

The second host <NUM> may be a deuterated compound of the first host <NUM>. Namely, a hydrogen atom of the first host <NUM> may be substituted by a deuterium atom to form the second host <NUM>. A part or all of the hydrogen atoms of the compound of the first host <NUM> may be substituted by the deuterium atom.

For example, the compound of the second host <NUM> may be represented by Formula <NUM>:.

In Formula <NUM>, the definition of R <NUM>, R <NUM>, L <NUM>, L <NUM>, a and be is same as Formula <NUM>. In Formula <NUM>, Dx, Dy, Dm and Dn denote a number of the deuterium atom, and each of x, y, m and n is independently a positive integer. For example, a summation of x, y, m and n may be <NUM> to <NUM>.

In an exemplary embodiment, the second host <NUM> of Formula <NUM> may be a compound being one of the followings in Formula <NUM>:
<CHM>
<CHM>
<CHM>.

A compound of the blue dopant may be represented by Formula <NUM>-<NUM> or Formula <NUM>-<NUM>, but it is not limited thereto. <CHM>
<CHM>.

In Formula <NUM>-<NUM>, each of c and d is independently an integer of <NUM> to <NUM>, and e is an integer of <NUM> to <NUM>. Each of R <NUM> and R <NUM> is independently selected from the group consisting of C <NUM>∼C <NUM> alkyl group, C <NUM>∼C <NUM> aryl group, C <NUM>~C <NUM> hetero aryl group and C <NUM>∼C <NUM> aryl amino group, or adjacent two among R <NUM> or adjacent two among R <NUM> form a fused aromatic ring or a hetero-aromatic ring. R <NUM> is selected from the group consisting of C <NUM>∼C <NUM> alkyl group, C <NUM>∼C <NUM> aryl group, C <NUM>~C <NUM> hetero aryl group and C <NUM>~C <NUM> aromatic amino group. Each of X <NUM> and X <NUM> is independently oxygen (O) or NR <NUM>, and R <NUM> is C <NUM>~C <NUM> aryl group.

In Formula <NUM>-<NUM>, each of Ar <NUM>, Ar <NUM>, Ar <NUM> and Ar <NUM> is independently selected from the group consisting of C <NUM>∼C <NUM> aryl group and C <NUM>~C <NUM> hetero aryl group, and each of R <NUM> and R <NUM> is independently selected from the group consisting of hydrogen, C <NUM>∼C <NUM> alkyl group and C <NUM>∼C <NUM> aryl group. For example, each of Ar <NUM>, Ar <NUM>, Ar <NUM> and Ar <NUM> may be independently selected from the group consisting of phenyl, dibenzofuranyl, naphthyl and biphenyl and may be substituted by trifluoromethyl, cyano or fluorine (F). Each of R <NUM> and R <NUM> may be independently selected from the group consisting of hydrogen, isopropyl and phenyl.

For example, the blue dopant in Formula <NUM>-<NUM> may be a compound being one of the followings in Formula <NUM>-<NUM>:.

<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>.

For example, the blue dopant of Formula <NUM>-<NUM> may be a compound being one of the followings in Formula <NUM>-<NUM>:
<CHM>
<CHM>
<CHM>
<CHM>.

The EBL <NUM> includes an amine derivative as an electron blocking material. The material of the EBL <NUM> may be represented by Formula <NUM>:.

In Formula <NUM>, each of R <NUM>, R <NUM>, R <NUM> and R <NUM> is independently selected from the group consisting of monocyclic aryl group or polycyclic aryl group, and at least one of R <NUM>, R <NUM>, R <NUM> and R <NUM> is polycyclic aryl group. For example, two of R <NUM>, R <NUM>, R <NUM> and R <NUM> may be polycyclic aryl group. The monocyclic aryl group may be phenyl, and the polycyclic aryl group may be a fused-aryl group. The polycyclic aryl group may be an aryl group in which at least two phenyl groups are fused.

The electron blocking material of Formula <NUM> may be one of the followings of Formula <NUM>:.

The HBL <NUM> may include an azine derivative as a hole blocking material. For example, the material of the HBL <NUM> may be represented by Formula <NUM>:.

In Formula <NUM>, each of Y <NUM> to Y <NUM> are independently CR <NUM> or N, and one to three of Y <NUM> to Y <NUM> is N. R <NUM> is independently hydrogen or C <NUM>∼C <NUM> aryl group. L is C <NUM>∼C <NUM> arylene group, and R <NUM> is C <NUM>∼C <NUM> aryl group or C <NUM>∼C <NUM> hetero aryl group. R <NUM> is hydrogen, or adjacent two of R3 form a fused ring. "a" is <NUM> or <NUM>, "b" is <NUM> or <NUM>, and "c" is an integer of <NUM> to <NUM>.

The hole blocking material of Formula <NUM> may be one of the followings of Formula <NUM>:
<CHM>
<CHM>
<CHM>.

Alternatively, the HBL <NUM> may include a benzimidazole derivative as a hole blocking material. For example, the material of the HBL <NUM> may be represented by Formula <NUM>:.

In Formula <NUM>, Ar is C <NUM>~C <NUM> arylene group, R <NUM> is C <NUM>∼C <NUM> aryl group or C <NUM>∼C <NUM> hetero aryl group, and R <NUM> is C <NUM>∼C <NUM> alkyl group or C <NUM>∼C <NUM> aryl group.

For example, Ar may benaphthylene or anthracenylene, R <NUM> may be benzimidazole or phenyl, and R <NUM> may be methyl, ethyl or phenyl.

The hole blocking material of Formula <NUM> may be one of the followings of Formula <NUM>:
<CHM>.

The HBL <NUM> may include one of the hole blocking material of Formula <NUM> and the hole blocking material of Formula <NUM>.

In this instance, a thickness of the EML <NUM> may be greater than each of a thickness of the EBL <NUM> and a thickness of the HBL <NUM> and may be smaller than a thickness of the HTL <NUM>. For example, the EML may have a thickness of about <NUM> to 250Å, and each of the EBL <NUM> and the HBL <NUM> may have a thickness of about <NUM> to 150Å. The HTL <NUM> may have a thickness of about <NUM> to 1100Å. The EBL <NUM> and the HBL <NUM> may have the same thickness.

The HBL <NUM> may include both the hole blocking material of Formula <NUM> and the hole blocking material of Formula <NUM>. For example, in the HBL <NUM>, hole blocking material of Formula <NUM> and the hole blocking material of Formula <NUM> may have the same weight %.

In this instance, a thickness of the EML <NUM> may be greater than a thickness of the EBL <NUM> and may be smaller than a thickness of the HBL <NUM>. In addition, the thickness of HBL <NUM> may be smaller than a thickness of the HTL <NUM>. For example, the EML may have a thickness of about <NUM> to 300Å, and the EBL <NUM> may have a thickness of about <NUM> to 150Å. The HBL <NUM> may have a thickness of about <NUM> to 350Å, and the HTL <NUM> may have a thickness of about <NUM> to 1000Å.

The hole blocking material of Formula <NUM> and/or the hole blocking material of Formula <NUM> have an electron transporting property such that an electron transporting layer may be omitted. As a result, the HBL <NUM> directly contacts the EIL <NUM> or the second electrode <NUM> without the EIL <NUM>.

In the OLED D of the present disclosure, a weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM> to about <NUM>:<NUM>, preferably about <NUM>:<NUM> to about <NUM>:<NUM>. To provide sufficient emitting efficiency and lifespan of the OLED D and the organic light emitting display device, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>. On the other hand, to increase the lifespan without decrease of the emitting efficiency, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>. The OLED D and the organic light emitting display device of the present disclosure have advantages in the emitting efficiency and the lifespan.

In addition, when the EML <NUM> includes the blue dopant of Formula <NUM>-<NUM>, an image with narrow full width at half maximum (FWHM) and high color purity is provided.

Moreover, the EBL <NUM> includes an amine derivative as an electron blocking material, and the HBL <NUM> includes at least one of an azine derivative and a benzimidazole derivative as a hole blocking material. Accordingly, the lifespan of the OLED D and an organic light emitting device <NUM> is further improved.

<NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)-anthracene (<NUM>, <NUM> mmol), <NUM>,<NUM>,<NUM>,<NUM>-tetramethyl-<NUM>-(naphthlen-<NUM>-yl)-<NUM>,<NUM>,<NUM>-dioxaborolane (<NUM>, <NUM> mmol), tris (dibenzylideneacetone)dipalladium(<NUM>) (Pd <NUM>(dba) <NUM>) (<NUM>, <NUM> mmol) and toluene (<NUM>) were added into the flask (<NUM>) in the dry box. The reaction flask was removed from the dry box, and sodium carbonate anhydride (<NUM>, <NUM>) was added into the flask. The reactants were stirred and heated at <NUM> overnight with monitoring the reaction by HPLC (high-performance liquid chromatography). The reaction flask was cooled down to the room temperature, and then an organic layer was separated from an aqueous layer. The aqueous layer was washed with dichloromethane (DCM), and the organic layer was concentrated with the rotary vaporizer to obtain a gray powder. The gray power was purified with alumina, precipitated with hexane and performed column chromatography using silica gel to obtain the compound Host1 of white powder (<NUM>, yield: <NUM>%).

<NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)-anthracene (<NUM>, <NUM> mmol), <NUM>,<NUM>,<NUM>,<NUM>-tetramethyl-<NUM>-(<NUM>-(naphthlen-<NUM>-yl)phenyl)-<NUM>,<NUM>,<NUM>-dioxaborolane (<NUM>, <NUM> mmol), Pd <NUM>(dba) <NUM>) (<NUM>, <NUM> mmol) and toluene (<NUM>) were added into the flask (<NUM>) in the dry box. The reaction flask was removed from the dry box, and sodium carbonate anhydride (<NUM>, <NUM>) was added into the flask. The reactants were stirred and heated at <NUM> overnight with monitoring the reaction by HPLC. The reaction flask was cooled down to the room temperature and then an organic layer was separated from an aqueous layer. The aqueous layer was washed with dichloromethane (DCM) twice and the organic layer was concentrated with the rotary vaporizer to obtain a gray powder. The gray power was purified with alumina, precipitated with hexane and performed column chromatography using silica gel to obtain the compound Host2 of white powder (<NUM>, yield: <NUM>%).

<NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)-anthracene (<NUM>, <NUM> mmol), <NUM>,<NUM>,<NUM>,<NUM>-tetramethyl-<NUM>-(dibenzofuran-<NUM>-yl)-<NUM>,<NUM>,<NUM>-dioxaborolane (<NUM>, <NUM> mmol), Pd <NUM>(dba) <NUM>) (<NUM>, <NUM> mmol) and toluene (<NUM>) were added into the flask (<NUM>) in the dry box. The reaction flask was removed from the dry box, and sodium carbonate anhydride (<NUM>, <NUM>) was added into the flask. The reactants were stirred and heated at <NUM> overnight with monitoring the reaction by HPLC. The reaction flask was cooled down to the room temperature and then an organic layer was separated from an aqueous layer. The aqueous layer was washed with dichloromethane (DCM) twice and the organic layer was concentrated with the rotary vaporizer to obtain a gray powder. The gray power was purified with alumina, precipitated with hexane and performed column chromatography using silica gel to obtain the compound Host3 of white powder (<NUM>, yield: <NUM>%).

<NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)-anthracene (<NUM>, <NUM> mmol), <NUM>,<NUM>,<NUM>,<NUM>-tetramethyl-<NUM>-(dibenzofuran-<NUM>-yl)phenyl-<NUM>,<NUM>,<NUM>-dioxaborolane (<NUM>, <NUM> mmol), Pd <NUM>(dba) <NUM>) (<NUM>, <NUM> mmol) and toluene (<NUM>) were added into the flask (<NUM>) in the dry box. The reaction flask was removed from the dry box, and sodium carbonate anhydride (<NUM>, <NUM>) was added into the flask. The reactants were stirred and heated at <NUM> overnight with monitoring the reaction by HPLC. The reaction flask was cooled down to the room temperature and then an organic layer was separated from an aqueous layer. The aqueous layer was washed with dichloromethane (DCM) twice and the organic layer was concentrated with the rotary vaporizer to obtain a gray powder. The gray power was purified with alumina, precipitated with hexane and performed column chromatography using silica gel to obtain the compound Host4 of white powder (<NUM>, yield: <NUM>%).

Under N <NUM> condition, AlCl<NUM> (<NUM>, <NUM> mmol) was added to perdeuterobenzene solution (<NUM>) in which the compound Host2 (<NUM>, <NUM> mmol) was dissolved. The mixture was stirred under the room temperature for <NUM> hrs, and D <NUM>O (<NUM>) was added. After separating the aqueous layer and the organic layer, the aqueous layer was washed with CH <NUM>Cl <NUM> (<NUM>). The obtained organic layer was dried using magnesium sulfate, and the volatiles were removed by rotary evaporation. The crude product was purified by column chromatography to obtain the compound Host32 (<NUM>) of white powder.

Under N <NUM> condition, AlCl <NUM> (<NUM>, <NUM> mmol) was added to perdeuterobenzene solution (<NUM>) in which the compound Host4 (<NUM>, <NUM> mmol) was dissolved. The mixture was stirred under the room temperature for <NUM> hrs, and D <NUM>O (<NUM>) was added. After separating the aqueous layer and the organic layer, the aqueous layer was washed with CH <NUM>Cl <NUM> (<NUM>). The obtained organic layer was dried using magnesium sulfate, and the volatiles were removed by rotary evaporation. The crude product was purified by column chromatography to obtain the compound Host34 (<NUM>) of white powder.

Under N <NUM> condition, the flask containing <NUM>-nitroaniline (<NUM>), iodide benzene (<NUM>), copper iodide (<NUM>), potassium carbonate (<NUM>) and ortho-dichlorobenzene (<NUM>) was heated and stirred for <NUM> hours. The reaction solution was cooled to the room temperature, and ammonia water was added for liquid separation. The resultant was purified by silica gel column chromatography (developing solution: toluene/heptane = <NUM>/<NUM> (volume ratio)) to obtain <NUM>-nitro-N, N-diphenylaniline (<NUM>).

Under N <NUM> condition, acetic acid cooled in the ice-bath was added and stirred. <NUM>-nitro-N,N-diphenylaniline (<NUM>) was dropped into the solution to avoid significant increase the reaction temperature. After the addition was completed, the mixture was stirred at the room temperature for <NUM> minutes, and the disappearance of the starting materials was checked. After the reaction was completed, a supernatant liquid was collected by decantation, neutralized with sodium carbonate, and extracted with ethyl acetate. The resultant was purified by silica gel column chromatography (developing solution: toluene/heptane = <NUM>/<NUM> (volume ratio)). After removing the solvent by distillation under reduced pressure, heptane was added and reprecipitated to obtain N1,N1-diphenylbenzene-<NUM>,<NUM>-diamine (<NUM>).

Under N <NUM> condition, the flask containing N1,N1-diphenylbenzene-<NUM>,<NUM>-diamine (<NUM>), Pd-<NUM> (<NUM>), NaOtBu (<NUM>) and xylene (<NUM>) was stirred by heating at <NUM>. The solution of xylene (<NUM>), in which bromobenzene (<NUM>) was dissolved, was slowly dropped to the solution, and the mixture was heated and stirred for <NUM> hour after completion of dropping. After cooling the mixture to the room temperature, water and ethyl acetate were added for liquid separation. The resultant was purified by silica gel column chromatography (developing solution: toluene/heptane = <NUM>/<NUM> (volume ratio)) to obtain N1,N1,N3-triphenylbenzene-<NUM>,<NUM>-diamine (<NUM>).

Under N <NUM> condition, the flask containing N1,N1,N3-triphenylbenzene-<NUM>,<NUM>-diamine (<NUM>), <NUM>-bromo-<NUM>,<NUM>-dichlorobenzene (<NUM>), Pd-<NUM> (<NUM>), NaOtBu (sodium tert-buthoxide , <NUM>) and xylene (<NUM>) was heated and stirred at <NUM> for <NUM> hrs. After cooling the mixture to the room temperature, water and ethyl acetate were added for liquid separation. The resultant was purified by silica gel column chromatography (developing solution: toluene/heptane = <NUM>/<NUM> (volume ratio)) to obtain N1,N1'-(<NUM>-chloro-<NUM>,<NUM>-phenylene)bis(N1,N3,N3-triphenylbenzene-<NUM>,<NUM>-diamine) (<NUM>).

<NUM> tert-butyllithium pentane solution (<NUM>) was added into the flask containing N1,N1'-(<NUM>-chloro-<NUM>,<NUM>-phenylene)bis(N1,N,N3-triphenylbenzene-<NUM>,<NUM>-diamine) (<NUM>) and tert-butylbenzene (<NUM>) with cooling in the ice bath under N <NUM> condition. After heating up to <NUM> and stirring for <NUM> hrs, the component having boiling point lower than tert- butylbenzene was distilled off under reduced pressure. The mixture was cooled to -<NUM>, and boron tribromide (<NUM>) was added. The mixture was heated up to the room temperature and stirred for <NUM> hour. The mixture was cooled again in the ice bath, and N,N-diisopropylethylamine (<NUM>) was added. The mixture was stirred at the room temperature until the exotherm was finished. The mixture was heated to the temperature of <NUM> and stirred for <NUM> hrs. The solution was cooled to the room temperature, and an aqueous sodium acetate solution, which was cooled in the ice bath, and ethyl acetate was sequentially added to the solution. The insoluble solid was filtered and phase-separated. Then, the residue was purified by silica gel column chromatography (developing solution: toluene/heptane = <NUM>/<NUM> (volume ratio)). The mixture was washed with heated heptane and ethyl acetate, and then reprecipitated with a mixed solvent of toluene and ethyl acetate to obtain Dopant56 (<NUM>).

Under N <NUM> condition, the flask containing <NUM>-bromo-<NUM>,<NUM>-difluorobenzene (<NUM>), [<NUM>,<NUM>'-biphenyl] -<NUM>-ol (<NUM>), potassium carbonate (<NUM>) and NMP (<NUM>) was heated and stirred at <NUM> for <NUM> hrs. After the reaction was stopped, the reaction solution was cooled to the room temperature, and water and toluene were added for liquid separation. The solvent was distilled off under reduced pressure, and the resultant was purified by silica gel column chromatography (developing solution: heptane/toluene= <NUM>/<NUM> (volume ratio)) to obtain <NUM>,<NUM>"-((<NUM>-bromo-<NUM>,<NUM>-phenylene)bis(oxy)) di-<NUM>,<NUM>'-biphenyl (<NUM>) was obtained.

Under N <NUM> condition, the flask containing <NUM>,<NUM>"-((<NUM>-bromo-<NUM>,<NUM>-phenylene)bis(oxy))di-<NUM>,<NUM>'-biphenyl (<NUM>) and xylene (<NUM>) was cooled to -<NUM>, and n-butyllithium hexane solution (<NUM>, <NUM>) was dropped. After heating the mixture to the room temperature, the mixture was cooled again to -<NUM>, and boron tribromide (<NUM>) was added thereto. The mixture was heated to the room temperature and stirred for <NUM> hrs. The mixture was cooled to <NUM>, and N,N-diisopropylethylamine (<NUM>) was added. The mixture was heated and stirred at <NUM> for <NUM> hrs. The reaction solution was cooled to the room temperature, and an aqueous sodium acetate solution cooled in the ice bath was added and stirred. The precipitated solid was collected by suction filtration. The obtained solid was washed with water, methanol and heptane in that order and recrystallized from chlorobenzene to obtain the compound Dopant167 (<NUM>).

The anode (ITO, 50Å), the HIL (Formula <NUM>(97wt%) and Formula <NUM> (3wt%), <NUM>Å), the HTL (Formula <NUM>, <NUM>Å), the EBL (Formula <NUM>, <NUM>Å), the EML (host (98wt%) and dopant (2wt%), <NUM>Å), the HBL (Formula <NUM>, <NUM>Å), the EIL (Formula <NUM> (98wt%) and Li (2wt%), <NUM>Å) and the cathode (Al, <NUM>Å) was sequentially deposited to form the OLED. <CHM>
<CHM>
<CHM>
<CHM>
<CHM>
<CHM>.

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate (CIE), FWHM and lifespan (T95), of the OLEDs manufactured in Comparative Examples <NUM> to <NUM> and Examples <NUM> to <NUM> are measured and listed in Tables <NUM> to <NUM>.

As shown in Tables <NUM> to <NUM>, the lifespan of the OLED in Examples <NUM> to <NUM> using the first host, which is an anthracene derivative non-substituted with deuterium, and the second host, which is an anthracene derivative substituted with deuterium, is significantly increased in comparison to the OLED in Comparative Examples <NUM> to <NUM> using the first host without the second host.

In addition, in comparison to the OLED in Comparative Examples <NUM> to <NUM> using the second host without the first host, the lifespan of the OLED in Examples <NUM>, <NUM>, <NUM> and <NUM> is slightly decreased, but the emitting efficiency of the OLED in Examples <NUM>, <NUM>, <NUM> and <NUM> is improved.

Accordingly, in the OLED of the present disclosure, a weight % ratio of the first host to the second host may be about <NUM>:<NUM> to <NUM>:<NUM>. To provide sufficient emitting efficiency and lifespan of the OLED and the organic light emitting display device, the weight % ratio of the first host to the second host may be about <NUM>:<NUM>. On the other hand, to increase the lifespan without decrease of the emitting efficiency, the weight % ratio of the first host to the second host may be about <NUM>:<NUM>.

In the OLED D of the present disclosure, the EML <NUM> includes anthracene derivative as the first host <NUM> and deuterated anthracene derivative as the second host <NUM> such that the OLED D and the organic light emitting display device <NUM> has advantages in the emitting efficiency and the lifespan.

The anode (ITO, 50Å), the HIL (Formula <NUM>(97wt%) and Formula <NUM> (3wt%), <NUM>Å), the HTL (Formula <NUM>, <NUM>Å), the EBL (<NUM>Å), the EML (host (98wt%) and dopant (2wt%), <NUM>Å), the HBL (<NUM>Å), the EIL (Formula <NUM> (98wt%) and Li (2wt%), <NUM>Å) and the cathode (Al, <NUM>Å) was sequentially deposited to form the OLED.

The compound "Host4" in Formula <NUM> is used instead of the compound "Host2" in Comparative Examples <NUM> to <NUM>.

The compound "Dopant167" in Formula <NUM>-<NUM> is used instead of the compound "Dopant56" in Comparative Example <NUM>.

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate (CIE), FWHM and lifespan (T95), of the OLEDs manufactured in Comparative Examples <NUM> to <NUM> and Examples <NUM> to <NUM> are measured and listed in Tables <NUM> and <NUM>.

As shown in Tables <NUM> and <NUM>, in comparison to the OLED in Comparative Examples <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, the properties of the driving voltage, the emitting efficiency and the lifespan of the OLED in Comparative Examples <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, where the EBL includes the amine derivative of Formula <NUM>, and the HBL includes the azine derivative of Formula <NUM> or the benzimidazole derivative of Formula <NUM>, are improved.

In addition, when the EML of the OLED includes the first host of Formula <NUM>, which is an anthracene derivative, and the second host of Formula <NUM>, which is an anthracene derivative substituted with deuterium, as Examples <NUM> to <NUM>, the emitting efficiency and the lifespan are further improved.

The anode (ITO, 50Å), the HIL (Formula <NUM>(97wt%) and Formula <NUM> (3wt%), <NUM>Å), the HTL (Formula <NUM>, <NUM>Å), the EBL (<NUM>Å), the EML (host (98wt%) and dopant (2wt%), <NUM>Å), the HBL (<NUM>Å), the EIL (LiF, <NUM>Å) and the cathode (Al, <NUM>Å) was sequentially deposited to form the OLED.

The compound "H3"in Formula <NUM> is used instead of the compound of Formula <NUM> in Comparative Example <NUM>.

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate (CIE), FWHM and lifespan (T95), of the OLEDs manufactured in Comparative Examples <NUM> to <NUM> and Examples <NUM> and <NUM> are measured and listed in Table <NUM>.

As shown in Table <NUM>, in comparison to the OLED in Comparative Examples <NUM>, <NUM>, <NUM> and <NUM>, the emitting efficiency of the OLED in Comparative Examples <NUM> and <NUM> is improved, and the lifespan of the OLED in Comparative Examples <NUM> and <NUM> is significantly increased.

In addition, when the EML of the OLED includes the first host of Formula <NUM>, which is an anthracene derivative, and the second host of Formula <NUM>, which is an anthracene derivative substituted with deuterium, as Examples <NUM> and <NUM>, the emitting efficiency and the lifespan are further improved.

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

As shown in <FIG>, the OLED D includes the first and second electrodes <NUM> and <NUM> facing each other and the organic emitting layer <NUM> between the first and second electrodes <NUM> and <NUM>. The organic emitting layer <NUM> includes a first emitting part <NUM> including a first EML <NUM>, a second emitting part <NUM> including a second EML <NUM> and a charge generation layer (CGL) <NUM> between the first and second emitting parts <NUM> and <NUM>.

The first electrode <NUM> may be formed of a conductive material having a relatively high work function to serve as an anode for injecting a hole into the organic emitting layer <NUM>. The second electrode <NUM> may be formed of a conductive material having a relatively low work function to serve as a cathode for injecting an electron into the organic emitting layer <NUM>.

The CGL <NUM> is positioned between the first and second emitting parts <NUM> and <NUM>, and the first emitting part <NUM>, the CGL <NUM> and the second emitting part <NUM> are sequentially stacked on the first electrode <NUM>. Namely, the first emitting part <NUM> is positioned between the first electrode <NUM> and the CGL <NUM>, and the second emitting part <NUM> is positioned between the second electrode <NUM> and the CGL <NUM>.

The first emitting part <NUM> includes a first EML <NUM>, a first EBL <NUM> between the first electrode <NUM> and the first EML <NUM> and a first HBL between the first EML <NUM> and the CGL <NUM>.

In addition, the first emitting part <NUM> may further include a first HTL <NUM> between the first electrode <NUM> and the first EBL <NUM> and an HIL <NUM> between the first electrode <NUM> and the first HTL <NUM>.

The first EML <NUM> includes a first host <NUM>, which is an anthracene derivative, a second host <NUM>, which is a deuterated anthracene derivative, and a blue dopant (not shown) such that blue light is provided from the first EML <NUM>.

Namely, the first EML <NUM> may include the compound of Formula <NUM> as the first host <NUM>, the compound of Formula <NUM> as the second host <NUM> and the compound of Formula <NUM>-<NUM> or Formula <NUM>-<NUM> as the blue dopant.

In the first EML <NUM>, a weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM> to about <NUM>:<NUM>, preferably about <NUM>:<NUM> to about <NUM>:<NUM>. To provide sufficient emitting efficiency and lifespan of the OLED D and the organic light emitting display device, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>. On the other hand, to increase the lifespan without decrease of the emitting efficiency, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>.

The first EBL <NUM> may include an electron blocking material of Formula <NUM>. The first HBL <NUM> may include at least one of a hole blocking material of Formula <NUM> and a hole blocking material of Formula <NUM>.

The second emitting part <NUM> includes the second EML <NUM>, a second EBL <NUM> between the CGL <NUM> and the second EML <NUM> and a second HBL <NUM> between the second EML <NUM> and the second electrode <NUM>.

In addition, the second emitting part <NUM> may further include a second HTL <NUM> between the CGL <NUM> and the second EBL <NUM> and an EIL <NUM> between the second HBL <NUM> and the second electrode <NUM>.

The second EML <NUM> includes a first host <NUM>, which is an anthracene derivative, a second host <NUM>, which is a deuterated anthracene derivative, and a blue dopant (not shown) such that blue light is provided from the second EML <NUM>.

Namely, the second EML <NUM> may include the compound of Formula <NUM> as the first host <NUM>, the compound of Formula <NUM> as the second host <NUM> and the compound of Formula <NUM>-<NUM> or Formula <NUM>-<NUM> as the blue dopant.

In the second EML <NUM>, a weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM> to about <NUM>:<NUM>, preferably about <NUM>:<NUM> to about <NUM>:<NUM>. To provide sufficient emitting efficiency and lifespan of the OLED D and the organic light emitting display device, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>. On the other hand, to increase the lifespan without decrease of the emitting efficiency, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>.

The first host <NUM> of the second EML <NUM> may be same as or different from the first host <NUM> of the first EML <NUM>, and the second host <NUM> of the second EML <NUM> may be same as or different from the second host <NUM> of the first EML <NUM>. In addition, the blue dopant of the second EML <NUM> may be same as or different from the blue dopant of the first EML <NUM>.

The second EBL <NUM> may include an electron blocking material of Formula <NUM>. The second HBL <NUM> may include at least one of a hole blocking material of Formula <NUM> and a hole blocking material of Formula <NUM>.

The CGL <NUM> is positioned between the first and second emitting parts <NUM> and <NUM>. Namely, the first and second emitting parts <NUM> and <NUM> are connected through the CGL <NUM>. The CGL <NUM> may be a P-N junction CGL of an N-type CGL <NUM> and a P-type CGL <NUM>.

The N-type CGL <NUM> is positioned between the first HBL <NUM> and the second HTL <NUM>, and the P-type CGL <NUM> is positioned between the N-type CGL <NUM> and the second HTL <NUM>.

In the OLED D, since each of the first and second EMLs <NUM> and <NUM> includes the first host <NUM> and <NUM>, each of which is an anthracene derivative, and the second host <NUM> and <NUM>, each of which is a deuterated anthracene derivative, the OLED D and the organic light emitting display device <NUM> have advantages in the emitting efficiency and the lifespan.

In addition, at least one of the first and second EBLs <NUM> and <NUM> includes an amine derivative of Formula <NUM>, and at least one of the first and second HBLs <NUM> and <NUM> includes at least one of a hole blocking material of Formula <NUM> and a hole blocking material of Formula <NUM>. As a result, the lifespan of the OLED D and the organic light emitting display device <NUM> is further improved.

Moreover, since the first and second emitting parts <NUM> and <NUM> for emitting blue light are stacked, the organic light emitting display device <NUM> provides an image having high color temperature.

<FIG> is a schematic cross-sectional view illustrating an organic light emitting display device according to a second embodiment of the present disclosure, and <FIG> is a schematic cross-sectional view illustrating an OLED for the organic light emitting display device according to the second embodiment of the present disclosure.

As shown in <FIG>, the organic light emitting display device <NUM> includes a first substrate <NUM>, where a red pixel BP, a green pixel GP and a blue pixel BP are defined, a second substrate <NUM> facing the first substrate <NUM>, an OLED D, which is positioned between the first and second substrates <NUM> and <NUM> and providing white emission, and a color filter layer <NUM> between the OLED D and the second substrate <NUM>.

Each of the first and second substrates <NUM> and <NUM> may be a glass substrate or a plastic substrate. For example, each of the first and second substrates <NUM> and <NUM> may be a polyimide substrate.

A buffer layer <NUM> is formed on the substrate, and the TFT Tr corresponding to each of the red, green and blue pixels RP, GP and BP is formed on the buffer layer <NUM>. The buffer layer <NUM> may be omitted.

A reflection electrode or a reflection layer may be formed under the first electrode <NUM>. For example, the reflection electrode or the reflection layer may be formed of aluminum-palladium-copper (APC) alloy.

A bank layer <NUM> is formed on the passivation layer <NUM> to cover an edge of the first electrode <NUM>. Namely, the bank layer <NUM> is positioned at a boundary of the pixel and exposes a center of the first electrode <NUM> in the red, green and blue pixels RP, GP and BP. The bank layer <NUM> may be omitted.

An organic emitting layer <NUM> is formed on the first electrode <NUM>.

Referring to <FIG>, the organic emitting layer <NUM> includes a first emitting part <NUM> including a first EML <NUM>, a second emitting part <NUM> including a second EML <NUM>, a third emitting part <NUM> including a third EML <NUM>, a first CGL <NUM> between the first and second emitting parts <NUM> and <NUM> and a second CGL <NUM> between the second and third emitting parts <NUM> and <NUM>.

The first CGL <NUM> is positioned between the first and second emitting parts <NUM> and <NUM>, and the second CGL <NUM> is positioned between the second and third emitting parts <NUM> and <NUM>. Namely, the first emitting part <NUM>, the first CGL <NUM>, the second emitting part <NUM>, the second CGL <NUM> and the third emitting part <NUM> are sequentially stacked on the first electrode <NUM>. In other words, the first emitting part <NUM> is positioned between the first electrode <NUM> and the first CGL <NUM>, the second emitting part <NUM> is positioned between the first and second CGLs <NUM> and <NUM>, and the third emitting part <NUM> is positioned between the second electrode <NUM> and the second CGL <NUM>.

The first emitting part <NUM> may include an HIL <NUM>, a first HTL <NUM>, a first EBL <NUM>, the first EML <NUM> and a first HBL <NUM> sequentially stacked on the first electrode <NUM>. Namely, the HIL <NUM>, the first HTL <NUM> and the first EBL <NUM> are positioned between the first electrode <NUM> and the first EML <NUM>, and the first HBL <NUM> is positioned between the first EML <NUM> and the first CGL <NUM>.

The second EML <NUM> may include a second HTL <NUM>, the second EML <NUM> and an electron transporting layer (ETL) <NUM>. The second HTL <NUM> is positioned between the first CGL <NUM> and the second EML <NUM>, and the ETL <NUM> is positioned between the second EML <NUM> and the second CGL <NUM>.

The second EML <NUM> may be a yellow-green EML. For example, the second EML <NUM> may include a host and a yellow-green dopant. Alternatively, the second EML <NUM> may include a host, a red dopant and a green dopant. In this instance, the second EML <NUM> may include 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 third emitting part <NUM> may include a third HTL <NUM>, a second EBL <NUM>, the third EML <NUM>, a second HBL <NUM> and an EIL <NUM>. The third EML <NUM> (or the third emitting part <NUM>) includes a first host <NUM>, which is an anthracene derivative, a second host <NUM>, which is a deuterated anthracene derivative, and a blue dopant (not shown) such that blue light is provided from the third EML <NUM>. Namely, the third EML <NUM> may include the compound of Formula <NUM> as the first host <NUM>, the compound of Formula <NUM> as the second host <NUM> and the compound of Formula <NUM>-<NUM> or Formula <NUM>-<NUM> as the blue dopant.

In the third EML <NUM>, a weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM> to about <NUM>:<NUM>, preferably about <NUM>:<NUM> to about <NUM>:<NUM>. To provide sufficient emitting efficiency and lifespan of the OLED D and the organic light emitting display device, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>. On the other hand, to increase the lifespan without decrease of the emitting efficiency, the weight % ratio of the first host <NUM> to the second host <NUM> may be about <NUM>:<NUM>.

The first host <NUM> of the third EML <NUM> may be same as or different from the first host <NUM> of the first EML <NUM>, and the second host <NUM> of the third EML <NUM> may be same as or different from the second host <NUM> of the first EML <NUM>. In addition, the blue dopant of the third EML <NUM> may be same as or different from the blue dopant of the first EML <NUM>.

The second EBL <NUM> may include an electron blocking material of Formula <NUM>. The second HBL <NUM> may include at least one of a hole blocking material of Formula <NUM> and a hole blocking material of Formula <NUM>. The electron blocking material of the second EBL <NUM> may be same as or different from the electron blocking material of the first EBL <NUM>, and the hole blocking material of the second HBL <NUM> may be same as or different from the hole blocking material of the first HBL <NUM>.

The first CGL <NUM> is positioned between the first emitting part <NUM> and the second emitting part <NUM>, and the second CGL <NUM> is positioned between the second emitting part <NUM> and the third emitting part <NUM>. Namely, the first and second emitting stacks <NUM> and <NUM> are connected through the first CGL <NUM>, and the second and third emitting stacks <NUM> and <NUM> are connected through the second CGL <NUM>. The first CGL <NUM> may be a P-N junction CGL of a first N-type CGL <NUM> and a first P-type CGL <NUM>, and the second CGL <NUM> may be a P-N junction CGL of a second N-type CGL <NUM> and a second P-type CGL <NUM>.

In the first CGL <NUM>, the first N-type CGL <NUM> is positioned between the first HBL <NUM> and the second HTL <NUM>, and the first P-type CGL <NUM> is positioned between the first N-type CGL <NUM> and the second HTL <NUM>.

In the second CGL <NUM>, the second N-type CGL <NUM> is positioned between the ETL <NUM> and the third HTL <NUM>, and the second P-type CGL <NUM> is positioned between the second N-type CGL <NUM> and the third HTL <NUM>.

In the OLED D, since each of the first and third EMLs <NUM> and <NUM> includes the first host <NUM> and <NUM>, each of which is an anthracene derivative, the second host <NUM> and <NUM>, each of which is a deuterated anthracene derivative, and the blue dopant.

Accordingly, the OLED D including the first and third emitting parts <NUM> and <NUM> with the second emitting part <NUM>, which emits yellow-green light or red/green light, can emit white light.

In <FIG>, the OLED D has a triple-stack structure of the first, second and third emitting parts <NUM>, <NUM> and <NUM>. Alternatively, the OLED D may have a double-stack structure without the first emitting part <NUM> and the third emitting part <NUM>.

Referring to <FIG> again, a second electrode <NUM> is formed over the substrate <NUM> where the organic emitting layer <NUM> is formed.

In the organic light emitting display device <NUM>, since the light emitted from the organic emitting layer <NUM> is incident to the color filter layer <NUM> through the second electrode <NUM>, the second electrode <NUM> has a thin profile for transmitting the light.

The color filter layer <NUM> is positioned over the OLED D and includes a red color filter <NUM>, a green color filter <NUM> and a blue color filter <NUM> respectively corresponding to the red, green and blue pixels RP, GP and BP.

Although not shown, the color filter layer <NUM> may be attached to the OLED D by using an adhesive layer. Alternatively, the color filter layer <NUM> may 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.

In <FIG>, the light from the OLED D passes through the second electrode <NUM>, and the color filter layer <NUM> is disposed on or over the OLED D. Alternatively, when the light from the OLED D passes through the first electrode <NUM>, the color filter layer <NUM> may be disposed between the OLED D and the first substrate <NUM>.

A color conversion layer (not shown) may be formed between the OLED D and the color filter layer <NUM>. 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.

As described above, the white light from the organic light emitting diode D passes through the red color filter <NUM>, the green color filter <NUM> and the blue color filter <NUM> in the red pixel RP, the green pixel GP and the blue pixel BP such that the red light, the green light and the blue light are provided from thered pixel RP, the green pixel GP and the blue pixel BP, respectively.

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

As shown in <FIG>, the organic light emitting display device <NUM> includes a first substrate <NUM>, where a red pixel BP, a green pixel GP and a blue pixel BP are defined, a second substrate <NUM> facing the first substrate <NUM>, an OLED D, which is positioned between the first and second substrates <NUM> and <NUM> and providing white emission, and a color conversion layer <NUM> between the OLED D and the second substrate <NUM>.

Although not shown, a color filter may be formed between the second substrate <NUM> and each color conversion layer <NUM>.

A TFT Tr, which corresponding to each of the red, green and blue pixels RP, GP and BP, is formed on the first substrate <NUM>, and a passivation layer <NUM>, which has a drain contact hole <NUM> exposing an electrode, e.g., a drain electrode, of the TFT Tr is formed to cover the TFT Tr.

The OLED D including a first electrode <NUM>, an organic emitting layer <NUM> and a second electrode <NUM> is formed on the passivation layer <NUM>. In this instance, the first electrode <NUM> may be connected to the drain electrode of the TFT Tr through the drain contact hole <NUM>.

An bank layer <NUM> covering an edge of the first electrode <NUM> is formed at a boundary of the red, green and blue pixel regions RP, GP and BP.

The OLED D emits a blue light and may have a structure shown in <FIG> or <FIG>. 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 layer <NUM> includes a first color conversion layer <NUM> corresponding to the red pixel RP and a second color conversion layer <NUM> corresponding to the green pixel GP. For example, the color conversion layer <NUM> may include an inorganic color conversion material such as a quantum dot.

The blue light from the OLED D is converted into the red light by the first color conversion layer <NUM> in the red pixel RP, and the blue light from the OLED D is converted into the green light by the second color conversion layer <NUM> in the green pixel GP.

Accordingly, the organic light emitting display device <NUM> can display a full-color image.

On the other hand, when the light from the OLED D passes through the first substrate <NUM>, the color conversion layer <NUM> is disposed between the OLED D and the first substrate <NUM>.

Claim 1:
An organic light emitting diode (OLED), comprising:
a first electrode (<NUM>);
a second electrode (<NUM>) facing the first electrode;
a first emitting material layer (<NUM>) including a first host (<NUM>), a second host (<NUM>) and a blue dopant and positioned between the first and second electrodes;
a first electron blocking layer (EBL, <NUM>, <NUM>) including an electron blocking material of an amine derivative and positioned between the first electrode and the first emitting material layer; and
a first hole blocking layer (HBL, <NUM>, <NUM>) including at least one of a first hole blocking material and a second hole blocking material and positioned between the second electrode and the first emitting material layer,
wherein the first host is a non-deuterated anthracene derivative, and the second host is a deuterated anthracene derivative, and
wherein the first hole blocking material is an azine derivative, and the second hole blocking material is a benzimidazole derivative, .