DE102020126636A1 - ORGANIC LIGHT-EMITTING DIODE AND ORGANIC LIGHT-Emitting device having it - Google Patents

Abstract

The present disclosure provides an organic light-emitting diode (D) having a first connection and a second connection, an energy level of the first connection and an energy level of the second connection meeting a predetermined condition, and an organic light-emitting device that the organic light-emitting device Having diode (D) ready.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Korean Patent Application No. 10-2019-0130133 , filed in the Republic of Korea on October 18, 2019, and Korean Patent Application No. 10-2020-0114590 , filed in the Republic of Korea on September 8, 2020.

BACKGROUND

Technical area

The present disclosure relates to an organic light emitting diode, and more particularly relates to an organic light emitting diode excellent in emission characteristics and an organic light emitting device having the organic light emitting diode.

Discussion of related technology

Recently, there has been an increasing demand for flat panel display devices that have a small occupied area. Among the flat panel display devices, a technology of an organic light emitting display device which has an organic light emitting diode (OLED) and which can be referred to as an organic electroluminescent device is rapidly being developed.

The OLED emits light by injecting electrons from a cathode as an electron-injecting electrode and holes from an anode as a hole-injecting electrode into an emissive material layer, the electrons combine with the holes, an exciton is generated, and the exciton is an excited one State goes over to a basic state. In the fluorescent material, only a singlet exciton is involved in the emission, so that the fluorescent material of the related technology has a low emission yield. In the phosphorescent material, both the singlet exciton and the triplet exciton are involved in the emission, in such a way that the phosphorescent material has a higher emission yield than the fluorescent material. However, the metal complex compound, which is a typical phosphorus benzene material, has a short emission life and thus has a limitation in marketing.

SUMMARY

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

Additional features and advantages of the present disclosure will be made known in the following description and will be apparent from the description or will become apparent through application of the present disclosure. The objects and other advantages of the present disclosure can be realized and achieved by means of the features described herein as well as the appended drawings.

wobei n eine ganze Zahl von 1 bis 4 ist, wobei jedes von R1 und R2 unabhängig ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R1 und/oder benachbarte zwei von R2 sind derart verbunden, dass sie einen fusionierten Ring bilden, wobei die zweite Verbindung mittels Formel 2 wiedergegeben ist:

wobei jedes von R11 bis R17 ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R11 bis R17 sind derart verbunden, dass sie einen fusionierten Ring bilden, und wobei jedes von X1 und X2 unabhängig ausgewählt ist aus Fluor.To achieve these and other advantages in accordance with the aim of the embodiments of the present disclosure as described herein, organic light emitting diodes are provided according to the independent claims. Further embodiments are described in the dependent claims. One aspect of the present disclosure is an organic light emitting diode having a first electrode, a second electrode facing the first electrode, and an emissive material layer having a first connection and a second connection and between the first electrode and the second electrode is arranged, wherein the first compound is represented by formula 1:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40-heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second compound being represented by formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring, and each of X1 and X2 is independently selected from fluorine.

wobei n eine ganze Zahl von 1 bis 4 ist, wobei jedes von R1 und R2 unabhängig ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R1 und/oder benachbarte zwei von R2 sind derart verbunden, dass sie einen fusionierten Ring bilden, wobei die zweite Emittierendes-Material-Schicht zwischen der ersten Emittierendes-Material-Schicht und der ersten Elektrode angeordnet ist und eine zweite Verbindung der Formel 2 aufweist:

wobei jedes von R11 bis R17 ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R11 bis R17 sind derart verbunden, dass sie einen fusionierten Ring bilden, und wobei jedes von X1 und X2 unabhängig ausgewählt ist aus Fluor.Another aspect of the present disclosure is an organic light emitting diode that includes a first electrode, a second electrode that is opposite to the first electrode, and an emissive material layer that includes a first emissive material layer and a second emissive material layer. Having layer and being arranged between the first electrode and the second electrode, wherein the first emitting material layer has a first compound of the formula 1:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40 heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second emissive material layer being arranged between the first emissive material layer and the first electrode and has a second compound of Formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring, and each of X1 and X2 is independently selected from fluorine.

wobei n eine ganze Zahl von 1 bis 4 ist, wobei jedes von R1 und R2 unabhängig ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R1 und/oder benachbarte zwei von R2 sind derart verbunden, dass sie einen fusionierten Ring bilden, wobei die zweite Verbindung mittels der Formel 2 wiedergegeben ist:

wobei jedes von R11 bis R17 ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R11 bis R17 sind derart verbunden, dass sie einen fusionierten Ring bilden, und wobei jedes von X1 und X2 unabhängig ausgewählt ist aus Fluor.Another aspect of the present disclosure is an organic light emitting device comprising a substrate, an organic light emitting diode disposed on or above the substrate, the organic light emitting diode comprising: a first electrode, a second electrode facing the first electrode , and an emissive material layer which has a first connection and a second connection and is arranged between the first electrode and the second electrode, the first connection being represented by the formula 1:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40-heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second compound being represented by the formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring, and each of X1 and X2 is independently selected from fluorine.

wobei n eine ganze Zahl von 1 bis 4 ist, wobei jedes von R1 und R2 unabhängig ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R1 und/oder benachbarte zwei von R2 sind derart verbunden, dass sie einen fusionierten Ring bilden, wobei die zweite Emittierendes-Material-Schicht zwischen der ersten Emittierendes-Material-Schicht und der ersten Elektrode angeordnet ist und eine zweite Verbindung der Formel 2 aufweist:

wobei jedes von R11 bis R17 ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Deuterium, Tritium, einem C1- bis C20-Alkyl, einem C6- bis C30-Aryl und einem C3- bis C40-Heteroaryl, oder benachbarte zwei von R11 bis R17 sind derart verbunden, dass sie einen fusionierten Ring bilden, und wobei jedes von X1 und X2 unabhängig ausgewählt ist aus Fluor.Another aspect of the present disclosure is an organic light emitting device comprising a substrate, an organic light emitting diode disposed on or above the substrate, the organic light emitting diode comprising: a first electrode, a second electrode facing the first electrode , and an emissive material layer comprising a first emissive material layer and a second emissive material layer and disposed between the first electrode and the second electrode, the first emissive material layer having a first connection of the Formula 1 has:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40 heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second emissive material layer being arranged between the first emissive material layer and the first electrode and has a second compound of Formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring, and each of X1 and X2 is independently selected from fluorine.

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

Figure list

• 1 ist ein schematisches Schaltkreisdiagramm einer organischen lichtemittierenden Anzeigevorrichtung der vorliegenden Offenbarung.
• 2 ist eine schematische Querschnittansicht einer organischen lichtemittierenden Anzeigevorrichtung gemäß einer ersten Ausführungsform der vorliegenden Offenbarung.
• 3 ist eine schematische Querschnittansicht einer OLED gemäß einer zweiten Ausführungsform der vorliegenden Offenbarung.
• 4A und 4B sind schematische Ansichten, die eine EnergieniveauBeziehung einer ersten Verbindung und einer zweiten Verbindung in der OLED darstellen.
• 5 ist eine Ansicht, die eine Emissionsmechanismus einer OLED gemäß der zweiten Ausführungsform der vorliegenden Offenbarung darstellt.
• 6 ist eine schematische Querschnittansicht einer OLED gemäß einer dritten Ausführungsform der vorliegenden Offenbarung.
• 7 ist eine schematische Querschnittansicht einer OLED gemäß einer vierten Ausführungsform der vorliegenden Offenbarung.
• 8 ist eine schematische Querschnittansicht einer OLED gemäß einer fünften Ausführungsform der vorliegenden Offenbarung.
• 9 ist eine schematische Querschnittansicht einer organischen lichtemittierenden Anzeigevorrichtung gemäß einer sechsten Ausführungsform der vorliegenden Offenbarung.
• 10 ist eine schematische Querschnittansicht einer OLED gemäß einer siebten Ausführungsform der vorliegenden Offenbarung.
• 11 ist eine schematische Querschnittansicht einer organischen lichtemittierenden Anzeigevorrichtung gemäß einer achten Ausführungsform der vorliegenden Offenbarung.
• 12 ist eine schematische Querschnittansicht einer OLED gemäß einer neunten Ausführungsform der vorliegenden Offenbarung.
• 13 ist eine schematische Querschnittansicht einer OLED gemäß einer zehnten Ausführungsform der vorliegenden Offenbarung.

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

• 1 Figure 4 is a schematic circuit diagram of an organic light emitting display device of the present disclosure.
• 2 FIG. 13 is a schematic cross-sectional view of an organic light emitting display device according to a first embodiment of the present disclosure.
• 3 FIG. 12 is a schematic cross-sectional view of an OLED according to a second embodiment of the present disclosure.
• 4A and 4B Fig. 13 are schematic views showing an energy level relationship of a first connection and a second connection in the OLED.
• 5 FIG. 12 is a view illustrating an emission mechanism of an OLED according to the second embodiment of the present disclosure.
• 6th FIG. 12 is a schematic cross-sectional view of an OLED according to a third embodiment of the present disclosure.
• 7th FIG. 12 is a schematic cross-sectional view of an OLED according to a fourth embodiment of the present disclosure.
• 8th FIG. 3 is a schematic cross-sectional view of an OLED according to a fifth embodiment of the present disclosure.
• 9 FIG. 12 is a schematic cross-sectional view of an organic light emitting display device according to a sixth embodiment of the present disclosure.
• 10 FIG. 12 is a schematic cross-sectional view of an OLED according to a seventh embodiment of the present disclosure.
• 11 FIG. 12 is a schematic cross-sectional view of an organic light emitting display device according to an eighth embodiment of the present disclosure.
• 12th FIG. 3 is a schematic cross-sectional view of an OLED according to a ninth embodiment of the present disclosure.
• 13th FIG. 12 is a schematic cross-sectional view of an OLED according to a tenth embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to some examples and preferred embodiments shown in the accompanying drawings.

The present disclosure relates to an OLED in which a delayed fluorescent material and a fluorescent material are provided in a single emissive material layer or adjacent emissive material layers, and an organic light emitting device having the OLED. For example, the organic light emitting device may be an organic light emitting display device or an organic lighting device. As an example, basically, an organic light emitting display device that is a display device including the OLED of the present disclosure will be described.

1 Figure 4 is a schematic circuit diagram of an organic light emitting display device of the present disclosure.

As in 1 As shown, an organic light-emitting display device has a gate line GL, a data line DL, a voltage supply line PL, a switching thin-film transistor TFT Ts, a drive TFT Td, a storage capacitor Cst and an OLED D. The gate line GL and the data line DL cross each other to define a pixel area P. The pixel area P may be one of a red pixel area, a green pixel area, and a blue pixel area.

The switching TFT Ts is connected to the gate line GL and the data line DL, and the drive TFT Td and the storage capacitor Cst are connected to the switching TFT Ts and the power supply line PL. The OLED D is connected to the control TFT Td.

In the organic light emitting display device, when the switching TFT Ts is turned on by means of a gate signal applied through the gate line GL, a data signal is applied to the gate electrode of the drive TFT Td and one electrode of the storage capacitor Cst applied by the data line DL.

When the drive TFT Td is turned on by means of the data signal, the OLED D is supplied with an electric current from the power supply line PL. As a result, the OLED D emits light. In this case, when the drive TFT Td is turned on, a level of an electric current applied to the OLED D from the power supply line PL is set so that the OLED D can make a gray scale.

The storage capacitor Cst serves to maintain the voltage of the gate electrode of the driving TFT Td when the switching TFT Ts is turned off. Accordingly, even when the switching TFT Ts is turned off, a level of an electric current applied from the power supply line PL to the OLED D is maintained until a next frame.

As a result, the organic light emitting display device displays a desired image.

2 FIG. 13 is a schematic cross-sectional view of an organic light emitting display device according to a first embodiment of the present disclosure.

As in 2 shown, comprises the organic light emitting display device 100 a substrate 110 , a TFT Tr and an OLED D connected to the TFT Tr.

The substrate 110 can be a glass substrate or a flexible substrate. For example, the flexible substrate can be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate.

A buffer layer 122 is formed on the substrate and the TFT Tr is on the buffer layer 122 educated. The buffer layer 122 can be omitted.

A semiconductor layer 120 is on the buffer layer 122 educated. The semiconductor layer 120 may comprise an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 120 comprising the oxide semiconductor material, a light-shielding structure (not shown) under the semiconductor layer 120 be educated. That on the semiconductor layer 120 incident light is shielded or blocked by means of the light-shielding structure in such a way that thermal deterioration of the semiconductor layer 120 can be prevented. On the other hand, if the semiconductor layer 120 having polycrystalline silicon in both sides of the semiconductor layer 120 Be doped impurities.

A gate insulating layer 124 is on the semiconductor layer 120 educated. The gate insulating layer 124 may be formed from an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 130 formed of a conductive material such as metal is such on the gate insulating layer 124 formed that they are a center of the semiconductor layer 120 corresponds to.

In 2 is the gate insulating layer 124 on an entire surface of the substrate 110 educated. Alternatively, the gate insulating layer 124 be structured so that they have the same shape as the gate electrode 130 having.

An intermediate layer of insulation 132 , which is formed of an insulating material, is on the gate electrode 130 educated. The intermediate insulation layer 132 can be formed from an inorganic insulating material, for example silicon oxide or silicon nitride, or an organic insulating material, for example benzocyclobutene or photoacrylic.

The intermediate insulation layer 132 has a first contact hole 134 and a second contact hole 136 on both sides of the semiconductor layer 120 uncover. The first contact hole 134 and the second contact hole 136 are so on both sides of the gate electrode 130 arranged that they are at a distance from the gate electrode 130 are arranged.

The first contact hole 134 and the second contact hole 136 are through the gate insulating layer 124 formed therethrough. Alternatively, if the gate insulating layer 124 is structured to have the same shape as the gate electrode 130 , the first contact hole 134 and the second contact hole 136 only through the intermediate insulation layer 132 formed therethrough.

A source electrode 144 and a drain electrode 146 formed of a conductive material such as metal are on the interlayer insulating layer 132 educated.

The source electrode 144 and the drain electrode 146 are with respect to the gate electrode 130 arranged at a distance from one another and contact through the first contact hole 134 and the second contact hole 136 through both sides of the semiconductor layer 120 .

The semiconductor layer 120 who have favourited Gate Electrode 130 , the source electrode 144 and the drain electrode 146 form the TFT Tr. The TFT Tr serves as a driving element. In particular, the TFT Tr is the drive TFT Td (the 1 ).

In the TFT Tr are the gate electrodes 130 , the source electrode 144 and the drain electrode 146 over the semiconductor layer 120 arranged. In particular, the TFT Tr has a coplanar structure.

Alternatively, in the TFT Tr, the gate electrode may be arranged under the semiconductor layer, and the source electrode and the drain electrode may be arranged above the semiconductor layer, so that the TFT Tr can have an inverted stacked structure. In this case, the semiconductor layer can comprise amorphous silicon.

Although not shown, the gate line and the data line cross each other to define the pixel area, and the switching TFT is formed so as to coincide with the gate line and the data line connected is. The switching TFT is connected to the TFT Tr as the driving element. In addition, the power supply line, which may be formed so as to be parallel to and spaced from one of the gate line and the data line, and the storage capacitor for maintaining the voltage of the gate electrode of the TFT Tr may further be formed in a frame be.

A planarization layer 150 is on an entire surface of the substrate 110 formed so as to be the source electrode 144 and the drain electrode 146 covered. The planarization layer 150 provides a flat top surface and has a drain via 152 that is the drain electrode 146 of the TFT Tr exposed.

The OLED D is on the planarization layer 150 arranged and has a first electrode 210 that with the drain electrode 146 of the TFT Tr is connected to a light emitting layer 220 and a second electrode 230 on. The light emitting layer 220 and the second electrode 230 are consecutively on the first electrode 210 stacked. The OLED D is arranged in each of the red pixel area, green pixel area and blue pixel area, and emits the red light, the green light and the blue light, respectively.

The first electrode 210 is formed separately in each pixel area. The first electrode 210 may be an anode and may be formed from a conductive material, for example a translucent conductive oxide (TCO), which has a relatively high work function. For example, the first electrode 210 made 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) be formed.

When the organic light emitting display device 100 operated in a bottom emission type, the first electrode 210 have a single-layer structure of the transparent conductive material layer. When the organic light emitting display device 100 operated in a top emission type may have a reflective electrode or a reflective layer under the first electrode 210 be educated. For example, the reflective electrode or the reflective layer can be formed from silver (Ag) or an aluminum-palladium-copper (APC) alloy. In this case, the first electrode 210 have a three-layer structure made of ITO / Ag / ITO or ITO / APC / ITO.

There is also a dam layer 160 such on the planarization layer 150 formed that it is an edge of the first electrode 210 covered. In particular is the dam layer 160 arranged at a boundary of the pixel area and lays a center of the first electrode 210 free in the pixel area.

The light emitting layer 220 as an emitting unit is on the first electrode 210 educated. The light emitting layer 220 may have a single-layer structure of an emissive material layer (EML) comprising an emissive material. In order to increase an emission yield of the organic light-emitting display device, the light-emitting layer can 220 have a multilayer structure. For example, the light-emitting layer 220 furthermore have a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL) and an electron injection layer (EIL). The HIL, the HTL and the EBL are one after the other between the first electrode 210 and the EML, and the HBL, the ETL and the EIL are sequentially between the EML and the second electrode 230 arranged. In addition, the EML can have a single-layer structure or a multi-layer structure. Furthermore, two or more light-emitting layers can be arranged such that they are arranged at a distance from one another in such a way that the OLED D has a tandem structure.

The second electrode 230 is above the substrate 110 where the light emitting layer 220 is formed, formed. The second electrode 230 covers an entire surface of the display area and may be formed of a conductive material having a relatively low work function so that it serves as a cathode. For example, the second electrode 230 be formed from aluminum (AI), magnesium (Mg), calcium (Ca), silver (Ag) or their alloy or combination. In the organic light emitting display device 100 the second electrode can be of the top emission type 230 have a thin profile (a small thickness) for providing a light transmission property (or a semi-light transmission property).

Although not shown, the organic light emitting display device may 100 have a color filter corresponding to the red pixel area, the green pixel area and the blue pixel area. When the OLED D having the tandem structure and emitting white light is formed in all of the red pixel area, the green pixel area, and the blue pixel area, for example, a red Color filter structure, a green color filter structure and a blue color filter structure can be formed in the red pixel area, the green pixel area and the blue pixel area, respectively, so that a full color display is provided.

When the organic light emitting display device 100 operated in a bottom emission type, the color filter can be placed between the OLED D and the substrate 110 , for example between the intermediate insulation layer 132 and the planarization layer 150 , be arranged. Alternatively, if the organic light emitting display device 100 is operated in a top emission type, the color filter above the OLED D, for example above the second electrode 230 , be arranged.

An encapsulation layer 170 is on the second electrode 230 formed to prevent moisture from penetrating into the OLED D. The encapsulation layer 170 has a first inorganic insulating layer 172 , an organic insulating layer 174 and a second inorganic insulating layer 176 stacked one after another, but is not limited to this.

The organic light emitting display device 100 can furthermore have a polarizing plate (not shown) for reducing reflection of ambient light. For example, the polarizing plate can be a circular polarizing plate. In the organic light emitting display device 100 of the bottom emission type, the polarizing plate can be placed under the substrate 110 be arranged. In the organic light emitting display device 100 of the top emission type, the polarizing plate can be on or above the encapsulation layer 170 be arranged.

In addition, in the organic light emitting display device 100 of the top emission type, a cover window (not shown) on the encapsulation layer 170 or be attached to the polarizing plate. In this case show the substrate 110 and the cover window has a flexible property such that a flexible organic light emitting display device can be provided.

3 Fig. 3 is a schematic cross-sectional view of an OLED D1 according to a second embodiment of the present disclosure. The OLED D1 For example, it can be used as the OLED D in the organic light emitting display device 100 the 1 be applied.

As in 3 shown, the OLED D1 the first electrode 210 and the second electrode 230 facing each other and the light emitting layer therebetween 220 on. The light emitting layer 220 has an emitting material layer (EML) 240 on. The organic light emitting display device 100 (the 2 ) may have a red pixel area, a green pixel area and a blue pixel area, and the OLED D1 can be arranged in the green pixel area.

The first electrode 210 can be an anode, and the second electrode 230 can be a cathode.

The light emitting layer 220 can furthermore at least one of a hole transport layer (HTL) 260 between the first electrode 210 and the EML 240 and an electron transport layer (ETL) 270 between the second electrode 230 and the EML 240 exhibit.

In addition, the light-emitting layer 220 furthermore at least one of a hole injection layer (HIL) 250 between the first electrode 210 and the HTL 260 and an electron injection layer (EIL) 280 between the second electrode 230 and the ETL 270 exhibit.

Furthermore, the light-emitting layer 220 also at least one of an electron blocking layer (EBL) 265 between the HTL 260 and the EML 240 and a hole-blocking layer (HBL) 275 between the EML 240 and the ETL 270 exhibit.

For example, the HIL 250 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- (naphthalen-1-yl) -N-phenyl-amino) triphenylamine (1T-NATA), 4,4', 4" -Tris (N- (naphthalen-2 -yl) -N-phenyl-amino) triphenylamine (2T2-NATA), copper phthalocyanine (CuPc), tris (4-carbazoyl-9-yl-phenyl) amine (TCTA), N, N'-diphenyl-N, N ' -bis (1-naphthyl) -1,1'-biphenyl-4,4 "-diamine (NPB; NPD), 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (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-ethylenedioxythiphen) 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 have, but is not limited to this.

The HTL 260 at least one compound can be selected from the group consisting of N, N'-diphenyl-N, N'-bis (3-methylphenyl) -1,1'-biphenyl-4,4'-diamine (TPD), NPB (NPD) , 4,4'-bis (N-carbazolyl) -1,1'-biphenyl (CBP), poly [N, N'-bis (4-butylpnehyl) -N, N'-bis (phenyl) -benzidine] ( Poly-TPD), (poly [(9,9-dioctylfluorenyl-2,7-diyl) -co- (4,4 '- (N- (4-sec-butylphenyl) diphenylamine))] (TFB), di- [4- (N, N-di-p-tolyl-amino) -phenyl] cyclohexane (TAPC), 3,5-di (9H-carbazol-9-yl) -N, N-diphenylaniline (DCDPA), N- (Biphenyl-4-yl) -9,9-dimethyl-N- (4- (9-phenyl-9H-carbazol-3-yl) phenyl) -9H-fluorene-2-amine and N- (biphenyl-4- yl) -N- (4- (9-phenyl-9H-carbazol-3-yl) phenyl) biphenyl-4-amine, but is not limited to this.

The ETL 270 may include at least one of an oxadiazole-based compound, a triazole-based compound, a phenanthroline-based compound, a benzoxazole-based compound, a benzothiazole-based compound, a benzimidazole-based compound, and a triazine-based compound. For example, the ETL 270 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), 1,3,5-tris (N-phenylbenzimidazol-2-yl) benzene (TPBi), bis (2-methyl-8-quinolinolato-N1.08) - (1,1'-biphenyl -4-olato) aluminum (BAIq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-bis (naphthalen-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) have, but is not limited to this.

The ETL 280 may include, but is not limited to, at least one of an alkali halide compound such as LiF, CsF, NaF or BaF ₂ , and an organometallic compound such as Liq, lithium benzoate or sodium stearate.

The EBL 165 between the HTL 260 and the EML 240 to block electron transfer from the EML 240 to the HTL 260 is arranged, 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-fluorene-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), but is not limited to these .

The HBL 275 between the EML 240 and the ETL 270 to block the hole transition from the EML 240 in the ETL 270 is arranged, the above-mentioned material of the ETL 270 exhibit. For example, the material has the HDL 250 a HOMO energy level that is lower than that of an EML material 240 , and can contain at least one compound selected from the group consisting of BCP, BAIq, Alq3, PBD, Spiro-PBD, Liq, bis-4,6- (3,5-di-3-pyridylphenyl) -2-methylpyrimidine (B3PYMPM ), Bis [2- (diphenylphosphino) phenyl] teeth oxide (DPEPO), 9- (6-9H-carbazol-9-yl) pyridin-3-yl) -9H-3,9'-bicarbazole and TSPO1 not limited to this.

The EML 240 comprises a first compound of a delayed fluorescent material (compound) and a second compound of a fluorescent material (compound). The EML can also have a third compound as a host.

For example, as the host, the third compound can be one of 9- (3- (9H-carbazol-9-yl) phenyl) -9H-carbazole-3-carbonitrile (mCP-CN), CBP, 3,3'-bis ( N-carbazolyl) -1,1'-biphenyl (mCBP), 1,3-bis (carbazol-9-yl) benzene (mCP), oxy-bis (2,1-phenylene)) bis (diphenylphosphine oxide) (DPEPO) , 2,8-bis (diphenylphosphoryl) dibenzothiophene (PPT), 1,3,5-tri [(3-pyridyl) -phen-3-yl] benzene (TmPyPB), 2,6-di (9H-carbazole-9 -yl) pyridine (PYD-2Cz), 2,8-di (9H-carbazol-9-yl) dibenzothiophene (DCzDBT), 3 ', 5'-di (carbazol-9-yl) - [1,1'- bipheyl] -3,5-dicarbonitrile (DCzTPA), 4 '- (9H-carbazol-9-yl) biphenyl-3,5-dicarbonitrile (pCzB-2CN), 3' - (9H-carbazol-9-yl) biphenyl -3,5-dicarbonitrile (mCzB-2CN), diphenyl-4-triphenylsilylphenyl-phosphine oxide (TSPO1), 9- (9-phenyl-9H-carbazol-6-yl) -9H-carbazole (CCP), 4- (3 - (Triphenylen-2-yl) phenyl) dibenzo [b, d] thiophene), 9- (4- (9H-carbazol-9-yl) phenyl) -9H-3,9'-bicarbazole, 9- (3- (9H-carbazol-9-yl) phenyl) -9H-3,9'-bicarbazole or 9- (6- (9H-carbazol-9-yl) pyridin-3-yl) -9H-3,9'-bicabazole be, however, is not on this limited.

The Delayed Fluorescent Material as the first compound in the EML 240 is shown using formula 1.

In Formula 1, n is an integer from 1 to 4. Each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 - to C40-heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are linked (or bonded) in such a way that they form a fused ring. The fused ring can be a C6 to C20 fused alicyclic ring, a C4 to C20 fused heteroalicyclic ring, a C6 to C20 fused aromatic ring, or a C4 to C20 fused heteroaromatic ring.

For example, n can be 3 or 4, and each of R1 and R2 can be independently selected from hydrogen, a C1 to C20 alkyl, e.g. methyl, and a C6 to C30 aryl, e.g. phenyl.

The first compound can be one of compounds of Formula 2.

A difference between a singlet energy level and a triplet energy level of the delayed fluorescent material is very small (for example, about 0.3 eV or less). The energy of the triplet exciton of the delayed fluorescent material is converted into the singlet exciton by means of reverse intercombination (RISC) in such a way that the delayed fluorescent material has a high quantum yield. However, since the delayed fluorescent material has a wide full-width-at-half-maximum (FWHM), the delayed fluorescent material has a disadvantage in color purity.

To overcome the problem of color purity of the delayed fluorescent material, the EML is there 240 furthermore the second compound of the fluorescent material to provide hyper-fluorescence.

The second compound of the fluorescent material is shown using Formula 3.

In Formula 3, each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 through R17 are linked (or bonded) to form a fused ring. The fused ring can be a C6-C20 fused alicyclic ring, a C4-C20 fused heteroalicyclic ring, a C6-C20 fused aromatic ring, or a C4-C20 fused heteroaromatic ring. Each of X1 and X2 is independently selected from fluorine.

In this case, alkyl, aryl and heteroaryl are substituted or unsubstituted, and the substituent can be a C1 to C20 alkyl, a C1 to C20 alkoxy, a C6 to C30 aryl or a C3 to C40 heteroaryl.

For example, each of R11 to R15 can be independently selected from an unsubstituted aryl, an unsubstituted heteroaryl, an aryl which is substituted by alkyl, an aryl which is substituted by alkoxy, and an aryl which is substituted by alkyl and alkoxy is substituted, and each of R16 and R17 can be hydrogen. In addition, each of X1 and X2 can be fluorine.

The second compound can be one of Formula 4 compounds.

The EML (e.g. 240) in the OLED (e.g. D1) of the present disclosure has the first connection and the second connection, and the exciton of the first connection is carried over to the second connection. As a result, the OLED provides the emission with narrow FWHM and high emission efficiency.

In the OLED of the present disclosure, an energy level of the first connection and an energy level of the second connection meet a predetermined condition such that the transport efficiency of the exciton from the first connection to the second connection is increased. Accordingly, the emission efficiency and the color purity of the OLED and the organic light-emitting display device are improved.

In addition, the energy level of the first compound, the energy level of the second compound, and an energy level of the third compound meet a predetermined condition so that the emission efficiency and the color purity of the OLED and the organic light emitting display device can be further improved.

Referring to 4A 6, which is a schematic view illustrating an energy level relationship of a first compound and a second compound in the OLED of the present disclosure, a lowest unoccupied molecular orbital (LUMO) energy level “LUMO1” of the first compound is equal to or higher than a LUMO energy level “LUM02” of the second connection, and a difference “ΔLUMO” between the LUMO energy level “LUMO1” of the first connection and the LUMO energy level “LUM02” of the second connection is approximately 0.6 eV or less. (ΔLUMO (= | LUMO2-LUMO1 |) ≤ 0.6 eV)

In addition, a highest occupied molecular orbital (HOMO) energy level “HOMO1” of the first compound is equal to or lower than a HOMO energy level “HOM02” of the second compound. For example, a difference “ΔHOMO” between the HOMO energy level “HOMO1” of the first connection and the HOMO energy level “HOM02” of the second connection is approximately 0.5 eV or less. The difference “ΔLUMO” between the LUMO energy level “LUMO1” of the first connection and the LUMO energy level “LUM02” of the second connection can be greater than the difference “ΔHOMO” between the HOMO energy level “HOMO1” of the first connection and the HOMO -Energy level "HOM02" of the second connection.

In particular, an energy level of the first compound as the delayed fluorescent compound and an energy level of the second compound as the fluorescent compound are matched to each other, the charge is quickly transferred into the second compound as an emitter. As a result, there is a recombination zone in a center of the EML such that the driving voltage of the OLED is decreased and the emission efficiency of the OLED is increased.

Furthermore, an energy band gap of the first connection can be approximately 2.0 to 3.0 eV and can be larger than that of the second connection. For example, the energy band gap of the first compound can be approximately 2.4 to 2.8 eV.

As mentioned above, the first compound of the delayed fluorescent material uses the singlet exciton energy and the triplet exciton energy for emission. Accordingly, in the EML 240 having the first connection and the second connection transmit the power of the first connection into the second connection, and the light is emitted from the second connection. As a result, the emission efficiency and the color purity of the OLED are improved.

On the other hand, if a delayed fluorescent material and a fluorescent material in the EML do not meet the above energy level relationship, there is a limitation in emission efficiency and / or color purity. In particular, with reference to FIG 4B , if a difference “ΔLUMO” between the LUMO energy level “LUMO1” of the delayed fluorescent material and the LUMO energy level “LUM02” of the fluorescent material is more than 0.6 eV, the exciton generated in the host does not move into the delayed- Fluorescent material is transferred and is transferred into the fluorescent material. Accordingly, the triplet energy of the fluorescent material is not involved in the emission, so that the emission yield of the OLED is reduced.

In the EML 240 the singlet energy level of the first compound is less than that of the third compound than the host and greater than that of the second compound. In addition, the triplet energy level of the first compound is less than that of the third compound than the host and greater than that of the second compound.

Furthermore, the HOMO energy level of the third connection is lower than that of both the first connection and the second connection, and the LUMO energy level of the third connection is higher than that of both the first connection and the second connection. For example, a difference between the HOMO energy level of the third connection and the HOMO energy level of the first connection or a difference between the LUMO energy level of the third connection and the LUMO energy level of the first connection may be about 0.5 eV or less, for example about 0.1 to 0.5 eV. When this condition is met, the charge transfer efficiency from the third compound to the first compound is improved so that the emission efficiency of the OLED is improved.

In the EML 240 For example, a weight ratio (% by weight) of the first compound may be larger than that of the second compound and may be smaller than that of the third compound. When the weight ratio of the first connection is larger than that of the second connection, the energy of the first connection is sufficiently transmitted to the second connection. For example, in the EML 240 the first compound can have a weight% of about 20 to 40, the second compound can have a weight% of about 0.1 to 5, and the third compound can have a weight% of about 60 to 75. However, it is not limited to this.

Referring to 5 which is a view illustrating an emission mechanism of an OLED according to the second embodiment of the present disclosure, the singlet energy level “S1” and the triplet energy level “T1” generated in the third compound as a host are shown respectively the singlet energy level "S1" and the triplet energy level "T1" of the first compound are transmitted as a delayed fluorescent material. Since a difference between the singlet energy level of the first connection and the triplet energy level of the first connection is relatively small, the triplet energy level "T1" of the first connection is converted into the singlet energy level "S1" of the first connection by means of the RISC ( For example, an exciton that has the triplet energy level “T1” of the first connection is transferred to the singlet energy level “S1” of the first connection). For example, the difference (ΔE _ST ) between the singlet energy level of the first compound and the triplet energy level of the first compound can be about 0.3 eV or less. Then the singlet energy level “S1” of the first connection is transferred into the singlet energy level “S1” of the second connection in such a way that the second connection provides the emission (for example the exciton becomes the singlet energy level “S1” of the first connection to the singlet energy level "S1" of the second connection).

As mentioned above, the first compound exhibiting a delayed fluorescence property has a high quantum efficiency. However, since the first link has a wide FWHM, the first link has a disadvantage in color purity. On the other hand, the second compound exhibiting a fluorescent property has a narrow FWHM. However, since the triplet exciton of the second compound does not participate in the emission, the second compound has a disadvantage in an emission yield.

However, in the OLED D1 According to the present disclosure, the singlet energy level of the first compound as the delayed fluorescent material is transferred to the second compound as the fluorescent dopant, and the emission is generated from the second compound. The emission yield and the color purity of the OLED are accordingly D1 improved. In addition, there are the first compound of Formula 1 and Formula 2 and the second compound of Formula 3 and Formula 4 in the EML 240 included are the emission yield and the color purity of the OLED D1 further improved.

[OLED]

One anode (ITO, 50nm), one HIL (HAT-CN (formula 5-1), 7nm), one HTL (NPB (formula 5-2), 78nm), one EBL (TAPC (formula 5-3), 15nm ), an EML (35nm), an HBL (B3PYMPM (formula 5-4), 10nm), an ETL (TPBi (formula 5-5), 25nm), an EIL (LiF) and a cathode are used to form an OLED in sequence deposited.

Comparative example 1 (Ref1)

A host (m-CBP (Formula 5-6), 64% by weight), a compound of Formula 6-1 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

Comparative example 2 (Ref2)

A host (m-CBP (Formula 5-6), 64% by weight), a compound of Formula 6-2 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

Comparative example 3 (Ref3)

A host (m-CBP (Formula 5-6), 64% by weight), a compound of Formula 6-3 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

Example 1 (Ex1)

A host (m-CBP (Formula 5-6), 64 wt%), the compound 1-1 of formula 2 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

Example 2 (Ex2)

A host (m-CBP (Formula 5-6), 64 wt%), the compound 1-5 of formula 2 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

Example 3 (Ex3)

A host (m-CBP (Formula 5-6), 64 wt%), the compound 1-11 of formula 2 (35% by weight) and the compound 2-12 of Formula 4 (1 wt%) are used to form the EML.

The emission properties of the OLED in the comparative examples 1 to 3 and Examples 1 to 3 are measured and listed in Table 1. (EQE = external quantum yield) Table 1 V cd / A In / W EQE (%) Ref1 6.1 14.2 8.7 5.8 Ref2 6.0 13.2 7.9 5.2 Ref3 5.8 16.2 9.9 7.3 Ex1 5.2 29.1 17.7 17.2 Ex2 5.3 29.2 17.1 17.4 Ex3 5.3 28.2 16.4 16.6

As shown in Table 1, the emission properties of the OLED in Examples 1 to 3 using the first compound of Formula 1 and Formula 2 and the second compound of Formula 3 and Formula 4 are improved.

The HOMO energy level and the LUMO energy level of the connections 1-1 , 1-5 and 1-11 of Formula 2 as the first compound of the present disclosure, the compound 2-12 of Formula 4 as the second compound of the present disclosure, the compounds of Formulas 6-1 through 6-3 are measured and listed in Table 2. Table 2 connection LUMO (eV) HOMO (eV) 2-12 -3.6 -5.8 1-1 -3.3 -5.7 1-5 -3.4 -6.0 1-11 -3.5 -6.0 Formula 6-1 -2.7 -5.7 Formula 6-2 -2.8 -5.8 Formula 6-3 -2.9 -5.8

The LUMO energy level of the first compound of the present disclosure, ie the compounds 1 -1 , 1-5 and 1-11 , is lower than that of the second link, that is, the link 2-12 , and a difference thereof is 0.6 eV or less. As a result, as shown in Table 1, the emission characteristics of the OLED are improved. On the other hand, there is a difference in the LUMO energy level of each of the compounds in Formulas 6-1 to 6-3 and the LUMO energy level of the compound 2-12 greater than 0, 6 eV, and the emission properties of the OLED that make up the compound 2-12 and any one of the compounds in formulas 6-1 to 6-3 are decreased.

In particular, the first compound of the present disclosure has two cyano groups and at least one carbazole group, for example three or four carbazole groups, which are bonded to a benzene nucleus, such that an energy level of the first compound as the delayed fluorescent compound and an energy level of the second Compound than the fluorescent compound are matched to one another. Accordingly, the emission yield of the OLED is improved.

6th Figure 3 is a schematic cross-sectional view of an OLED D2 according to a third embodiment of the present disclosure.

As in 6th shown, has an OLED D2 according to the third embodiment of the present disclosure, the first electrode 310 and the second electrode 330 facing each other and the light emitting layer therebetween 320 on. The light emitting layer 320 assigns an EML 340 on. The organic light emitting display device 100 (the 2 ) may have a red pixel area, a green pixel area and a blue pixel area, and the OLED D2 can be arranged in the green pixel area.

The first electrode 310 can be an anode, and the second electrode 330 can be a cathode.

The light emitting layer 320 can also include at least one from the HTL 360 between the first electrode 310 and the EML 340 and the ETL 370 between the second electrode 330 and the EML 340 exhibit.

In addition, the light-emitting layer 320 furthermore at least one from the HIL 350 between the first electrode 310 and the HTL 360 and the EIL 380 between the second electrode 330 and the ETL 370 exhibit.

Furthermore, the light-emitting layer 320 further at least one from the EBL 365 between the HTL 360 and the EML 340 and the HBL 375 between the EML 340 and the ETL 370 exhibit.

The EML 340 comprises a first EML (a first layer or a lower emissive material layer) 342 and a second EML (a second layer or an upper emissive material layer) 344 successively over the first electrode 310 are stacked on. In particular, the second is EML 344 between the first EML 342 and the second electrode 330 arranged.

In the EML 340 assigns one from the first EML 342 and the second EML 344 the first compound of the Delayed Fluorescent Material in Formula 1 and Formula 2, and the other of the first EML 342 and the second EML 344 has the second compound of the fluorescent material in Formula 3 and Formula 4. Also show the first EML 342 and the second EML 344 furthermore a fourth compound or a fifth compound as a host. The fourth link in the first EML 342 and the fifth link in the second EML 344 can be the same or different. For example, both the host of the first EML 342 , i.e. the fourth compound, as well as the host of the second EML 344 , ie the fifth connection, the above-mentioned third connection.

The OLED, in which the first EML 342 the first compound of the delayed fluorescent material will be explained below.

As mentioned above, the first compound exhibiting a delayed fluorescence property has a high quantum efficiency. However, since the first link has a wide FWHM, the first link has a disadvantage in color purity. On the other hand, the second compound exhibiting a fluorescent property has a narrow FWHM. However, the triplet exciton of the second compound is not involved in the emission, the second compound has a disadvantage in an emission yield.

In the OLED D2 represents as the triplet exciton energy of the first compound in the first EML 342 is converted into the singlet exciton energy of the first compound and the singlet exciton energy of the first compound by means of the RISC into the singlet exciton energy of the second compound in the second EML 344 is transmitted, the second connection is ready for emission. Accordingly, both the Singlet exciton energy and the triplet exciton energy are involved in the emission in such a way that the emission yield is improved. In addition, since the emission is provided from the second compound of the fluorescent material, the emission having a narrow FWHM is provided.

As mentioned above, the LUMO energy level of the first connection is equal to or higher than that of the second connection, and a difference between the LUMO energy level of the first connection and the LUMO energy level of the second connection is about 0.6 eV or less. As a result, the emission efficiency of the OLED is D2 further improved.

In the first EML 342 the weight ratio of the fourth compound may be equal to or greater than that of the first compound. In the second EML 344 the weight ratio of the fifth compound may be equal to or less than that of the second compound.

In addition, a weight ratio of the first compound in the first EML 342 be greater than that of the second link in the second EML 344 . As a result, the energy from the first connection becomes sufficient in the first EML 342 by means of fluorescence resonance energy transfer (FRET) into the second compound in the second EML 344 transfer. For example, the first connection can be in the first EML 342 have a weight% of about 1 to 50, preferably about 10 to 40, more preferably about 20 to 40. The second compound can be in the second EML 344 have a weight% of about 1 to 10, preferably about 1 to 5.

When the HBL 375 between the second EML 344 and the ETL 370 is arranged, the fifth compound can act as the host of the second EML 344 like a material from HBL 375 be. In this case the second EML 344 have a hole-blocking function with an emission function. In particular, the second EML 344 serve as a buffer layer to block the hole. When the HBL 375 is omitted, the second EML 344 serve as an emissive material layer and a hole blocking layer.

When the first EML 342 comprises the second compound of the fluorescent material and the EBL 365 between the HTL 360 and the first EML 342 may be the host of the first EML 342 like a material from the EBL 365 be. In this case the first EML 342 have an electron blocking function with an emission function. In particular, the first EML 342 serve as a buffer layer to block the electron. When the EBL 365 is omitted, the first EML 342 serve as an emissive material layer and an electron blocking layer.

7th FIG. 12 is a schematic cross-sectional view of an OLED according to a fourth embodiment of the present disclosure.

As in 7th shown, has an OLED D3 according to the fourth embodiment of the present disclosure, the first electrode 410 and the second electrode 430 facing each other and the light emitting layer therebetween 420 on. The light emitting layer 420 assigns an EML 440 on. The organic light emitting display device 100 (the 2 ) may have a red pixel area, a green pixel area and a blue pixel area, and the OLED D3 can be arranged in the green pixel area.

The first electrode 410 can be an anode, and the second electrode 430 can be a cathode.

The light emitting layer 420 can also include at least one from the HTL 460 between the first electrode 410 and the EML 440 and the ETL 470 between the second electrode 430 and the EML 440 exhibit.

In addition, the light-emitting layer 420 furthermore at least one from the HIL 450 between the first electrode 410 and the HTL 460 and the EIL 480 between the second electrode 430 and the ETL 470 exhibit.

Furthermore, the light-emitting layer 420 furthermore at least one from the EBL 465 between the HTL 460 and the EML 440 and the HBL 475 between the EML 440 and the ETL 470 exhibit.

The EML 440 has a first EML (a first layer, an emissive material interlayer) 442, a second EML (a second layer, a lower emissive material layer) 444 between the first EML 442 and the first electrode 410 , and a third EML (a third layer, a top emissive material layer) 446 between the first EML 442 and the second electrode 430 on. In particular, the EML 440 a three-layer structure of the second EML 444 , the first EML 442 and the third EML 446 stacked one after the other.

For example, the first EML 442 between the EBL 465 and the HBL 475 be arranged, the second EML 444 can between the EBL 465 and the first EML 442 and the third EML 446 can between the HBL 475 and the first EML 442 be arranged.

In the EML 440 assigns the first EML 442 the first compound of the delayed fluorescent material in Formula 1 and Formula 2, and each of the second EML 444 and the third EML 446 has the second compound of the fluorescent material in Formula 3 and Formula 4. The second link in the second EML 444 and the second link in the third EML 446 can be the same or different. Also assign the first EML to the third EML 442 , 444 and 446 furthermore a sixth compound, a seventh compound and an eighth compound as a host. The sixth compound in the first EML 442 , the seventh compound in the second EML 444 and the eighth link in the third EML 446 can be the same or different. For example, both the host of the first EML 442 , i.e. the sixth compound, the host of the second EML 444 , ie the seventh compound, as well as the host of the third EML 446 , that is, the eighth connection will be the third connection mentioned above.

In the OLED D3 represents as the triplet exciton energy of the first compound in the first EML 442 is converted into the singlet exciton energy of the first compound and the singlet exciton energy of the first compound by means of the RISC into the singlet exciton energy of the second compound in the second EML 444 and into the singlet exciton energy of the second compound in the third EML 446 is transmitted, the second connection in the second EML 444 and the third EML 446 the issue ready. Accordingly, both the singlet exciton energy and the triplet exciton energy are involved in the emission, so that the emission yield is improved. In addition, since the emission is provided from the second compound of the fluorescent material, the emission having a narrow FWHM is provided.

As mentioned above, the LUMO energy level of the first connection is equal to or higher than that of the second connection, and a difference between the LUMO energy level of the first connection and the LUMO energy level of the second connection is about 0.6 eV or less. As a result, the emission efficiency of the OLED is D3 further improved.

In the first EML 442 the weight ratio of the sixth compound may be equal to or greater than that of the first compound. In the second EML 444 the weight ratio of the seventh compound may be equal to or less than that of the second compound. In the third EML 446 the weight ratio of the eighth compound may be equal to or less than that of the second compound.

In addition, a weight ratio of the first compound in the first EML 442 be greater than both that of the second link in the second EML 444 as well as that of the second connection in the third EML 446 . As a result, the energy is sufficiently removed from the first compound in the first EML by means of fluorescence resonance energy transition (FRET) 442 into the second link in the second EML 444 and the second link in the third EML 446 transfer. For example, the first compound can have a weight% of about 1 to 50 in the first EML 442 , preferably about 10 to 40, more preferably about 20 to 40. The second compound can have a weight% of about 1 to 10 in both the second EML 444 as well as the third EML 446 preferably about 1 to 5.

The seventh compound as the host of the second EML 444 can be the same as a material of the EBL 465 . In this case the second EML 444 have an electron blocking function with an emission function. In particular, the second EML 444 serve as a buffer layer for blocking electrons. When the EBL 465 is omitted, the second EML can be used 444 serve as an emitting layer and an electron blocking layer.

The eighth compound as the host of the third EML 446 can be the same as a material from HBL 475 . In this case the third EML 446 have a hole-blocking function with an emission function. In particular, the third EML 446 serve as a buffer layer to block holes. When the HBL 475 is omitted, the third EML can be used 446 serve as an emitting layer and a hole blocking layer.

The seventh link in the second EML 444 can be the same as an EBL material 465 , and the eighth link in the third EML 446 can be the same as a material from HBL 475 . In this case the second EML 444 have an electron blocking function with an emission function, and the third EML 446 may have a hole-blocking function with an emission function. In particular, the second EML 444 serve as a buffer layer to block electrons, and the third EML 446 can serve as a buffer layer to block holes. When the EBL 465 and the HBL 475 are omitted, the second EML 444 serve as an emissive material layer and an electron blocking layer, and the third EML 446 serves as an emissive material layer and a hole blocking layer.

8th FIG. 3 is a schematic cross-sectional view of an OLED according to a fifth embodiment of the present disclosure.

As in 8th shown, the OLED D4 the first electrode 510 and the second electrode 530 facing each other, and in between the emissive layer 520 on. The organic light emitting display device 100 (the 2 ) may have a red pixel area, a green pixel area and a blue pixel area, and the OLED D4 can be arranged in the green pixel area.

The first electrode 510 can be an anode, and the second electrode 530 can be a cathode.

The emitting layer 520 has a first emitting part 540 having a first EML 550 and a second emitting part 560 having a second EML 570 has on. In addition, the emitting layer 520 furthermore a charge generation layer (CGL) 580 between the first emitting part 540 and the second emitting part 560 exhibit.

The CGL 580 is between the first emitting part 540 and the second emitting part 560 arranged such that the first emitting part 540 who have favourited the CGL 580 and the second emitting part 560 one after the other on the first electrode 510 are stacked. In particular, the first is the emitting part 540 between the first electrode 510 and the CGL 580 arranged, and the second emitting part 580 is between the second electrode 530 and the CGL 580 arranged.

The first emitting part 540 assigns the first EML 550 on.

In addition, the first emitting part 540 furthermore at least one of a first HTL 540b between the first electrode 510 and the first EML 550 , a HIL 540a between the first electrode 510 and the first HTL 540b and a first ETL 540e between the first EML 550 and the CGL 580 exhibit.

Furthermore, the first emitting part 540 furthermore at least one of a first EBL 540c between the first HTL 540b and the first EML 550 and a first HBL 540d between the first EML 550 and the first ETL 540e exhibit.

The second emitting part 560 assigns the second EML 570 on.

In addition, the second emitting part 560 furthermore at least one of a second HTL 560a between the CGL 580 and the second EML 570 , a second ETL 560d between the second EML 570 and the second electrode 164 and an EIL 560e between the second ETL 560d and the second electrode 530 exhibit.

Furthermore, the second emitting part 560 furthermore at least one of a second EBL 560b between the second HTL 560a and the second EML 570 and a second HBL 560c between the second EBL 570 and the second ETL 560d exhibit.

The CGL 580 is between the first emitting part 540 and the second emitting part 560 arranged. In particular, the first emitting part 540 and the second emitting part 560 by the CGL 580 connected with each other. The CGL 580 may be a PN junction type CGL of an N type CGL 582 and a P-type CGL 584 be.

The N-type CGL 582 is between the first ETL 540e and the second HTL 560a arranged, and the P-type CGL 584 is between the N-type CGL 582 and the second HTL 560a arranged. The N-type CGL 582 puts in the first EML 550 of the first emitting part 540 an electron ready, and the P-type CGL 584 poses in the second EML 570 of the second emitting part 560 a hole ready.

The first EML 550 and the second EML 570 are a green EML. At least one from the first EML 550 and the second EML 570 exhibits the first compound of formula 1 and the second compound of formula 3. For example, the first EML 550 the first compound which is the delayed fluorescent compound and the second compound which is the fluorescent compound. The first EML 550 may further comprise a third compound that is a host.

In the first EML 550 For example, the weight ratio of the first compound can be greater than that of the second compound and less than that of the third compound. When the weight ratio of the first connection is larger than that of the second connection, the energy transfer from the first connection to the second connection is sufficiently generated. For example, in the first EML 550 the first compound can have a weight% of about 20 to 40, the second compound can have a weight% of about 0.1 to 5, and the third compound can have a weight% of about 60 to 75. However, it is not limited to this.

The second EML 570 may have the first compound of formula 1 and the second compound of formula 3. In particular, the second EML 570 the same organic compound as the first EML 550 exhibit. Alternatively, the second EML 570 comprise a connection different from at least one of the first connection and the second connection in the first EML 550 , such that the first EML 550 and the second connection EML 570 have a difference in a wavelength of emitted light or an emission efficiency.

In the OLED D4 According to the present disclosure, the singlet energy level of the first compound is transferred as the delayed fluorescent material to the second compound as the fluorescent dopant, and the emission is generated from the second compound. The emission yield and the color purity of the OLED are accordingly D4 improved. In addition, there are the first compound of Formula 1 and Formula 2 and the second compound of Formula 3 and Formula 4 in the first EML 550 included are the emission yield and the color purity of the OLED D1 further improved. Furthermore, since the OLED D4 has a two-stack structure (double-stack structure) with two green EMLs, the color perception of the OLED D4 improved and / or the emission yield of the OLED D4 is optimized.

9 FIG. 12 is a schematic cross-sectional view of an organic light emitting display device according to a sixth embodiment of the present disclosure.

As in 9 shown, comprises the organic light emitting display device 1000 a substrate 1010 , in which a first pixel area to a third pixel area P1 , P2 and P3 are defined, a TFT Tr above the substrate 1010 and an OLED D5 on. The OLED D5 is arranged above the TFT Tr and is connected to the TFT Tr. For example, the first pixel area to the third pixel area P1 , P2 and P3 be a green pixel area, a red pixel area and a blue pixel area, respectively.

The substrate 1010 can be a glass substrate or a flexible substrate. For example, the flexible substrate can be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate.

A buffer layer 1012 is on the substrate 1010 is formed and the TFT Tr is on the buffer layer 1012 educated. The buffer layer 1012 can be omitted.

How with 2 As explained, the TFT Tr may include a semiconductor layer, a gate electrode, a source electrode, and a drain electrode, and can serve as a driving element.

A planarization layer (or passivation layer) 1050 is formed on the TFT door. The planarization layer 1050 has a flat top surface and has a drain contact hole 1052 exposing the drain electrode of the TFT Tr.

The OLED D5 is on the planarization layer 1050 arranged and has a first electrode 1060 , an emissive layer 1062 and a second electrode 1064 on. The first electrode 1060 is connected to the drain electrode of the TFT Tr, and the emitting layer 1062 and the second electrode 1064 are consecutively on the first electrode 1060 stacked. The OLED D5 is in each of the first pixel area P1 to third pixel area P3 arranged and emitted in the first pixel area P1 to third pixel area P3 different colors. For example, the OLED D5 in the first pixel area P1 that emit green light, the OLED D5 in the second pixel area P2 can emit the red light, and the OLED D5 in the third pixel area P3 can emit the blue light.

The first electrode 1060 is formed in such a way that it is in the first pixel area P1 to third pixel area P3 is divided, and the second electrode 1064 is formed in one piece in such a way that it forms the first pixel area P1 to third pixel area P3 covered.

The first electrode 1060 is one of an anode and a cathode, and the second electrode 1064 is the other of the anode and the cathode. In addition, one of the first electrode 1060 and the second electrode 1064 be one transparent electrode (or semi-transparent electrode), and the other of the first electrode 1060 and the second electrode 1064 can be a reflective electrode.

For example, the first electrode 1060 be the anode and may have a translucent conductive oxide material layer formed from a translucent conductive oxide (TCO) material that has a relatively high work function. The second electrode 1064 may be the cathode and may be a metal material layer comprised of a low resistance metal material having a relatively low work function. For example, the transparent conductive oxide material layer of the first electrode 1060 at least one of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium copper oxide (ICO) and aluminum-zinc-oxide alloy (Al: ZnO), and the second electrode 1064 can include Al, Mg, Ca, Ag, their alloy, for example Mg-Ag alloy, or their combination.

In the bottom emission type organic light emitting display device 1000 can use the first electrode 1060 have a single-layer structure of the transparent conductive oxide material layer.

On the other hand, in the top emission type light emitting display device 1000 a reflective electrode or a reflective layer under the first electrode 1060 be educated. For example, the reflective electrode or the reflective layer can be made of Ag or aluminum-palladium-copper (APC) alloy. In this case, the first electrode 1060 have a three-layer structure made of ITO / Ag / ITO or ITO / APC / ITO. In addition, the second electrode 1064 have a thin profile (a small thickness) for providing a light transmission property (or a semi-light transmission property).

A layer of dam 1066 is on the planarization layer 1050 for covering an edge of the first electrode 1060 educated. In particular is the dam layer 1060 at a boundary of the first pixel area P1 through third pixel area P3 arranged and lays a center of the first electrode 1060 in the first pixel area P1 to third pixel area P3 free.

The emitting layer 1062 as an emitting unit is on the first electrode 1060 educated. The emitting layer 1062 can have a single-layer structure of an EML. Alternatively, the emitting layer 1062 furthermore at least one of an HIL, an HTL, an EBL successively between the first electrode 1060 and the EML, an HBL, an ETL and an EIIL are stacked one after the other between the EML and the second electrode 1064 are stacked.

As mentioned above, has in the first pixel area P1 , which is the green pixel area, the EML of the emissive layer 1062 the first compound, which is the delayed fluorescent compound, and the second compound, which is the fluorescent compound. The EML of the emitting layer 1062 may further comprise a third compound that is a host. The first compound is shown using Formula 1 and the second compound is shown using Formula 3.

An encapsulation layer 170 is on the second electrode 1064 to prevent moisture from penetrating the OLED D5 educated. The encapsulation layer 1070 may have a three-layer structure including a first inorganic insulating layer, an organic insulating layer, and a second inorganic insulating layer, but is not limited to this.

The organic light emitting display device 1000 can furthermore have a polarization plate (not shown) for reducing a reflection of ambient light. For example, the polarizing plate can be a circular polarizing plate. In the organic light emitting Bottom emission type display device 1000 can the polarizing plate under the substrate 1010 be arranged. In the top emission type organic light emitting display device 1000 the polarizing plate can be on or above the encapsulation layer 1070 be arranged.

10 FIG. 12 is a schematic cross-sectional view of an OLED according to a seventh embodiment of the present disclosure.

As in 10 shown is the OLED D5 in each of the first pixel area P1 through third pixel area P3 arranged and has the first electrode 1060 and the second electrode 1064 facing each other, and in between the emissive layer 1062 on. The emitting layer 1062 assigns an EML 1090 on.

The first electrode 1060 can be an anode, and the second electrode 1064 can be a cathode. For example, the first electrode 1060 be a reflective electrode, and the second electrode 1064 can be a translucent electrode (or a semi-translucent electrode).

The emitting layer 1062 can also be an HTL 1082 between the first electrode 1060 and the EML 1090 and an ETL 1094 between the EML 1090 and the second electrode 1064 exhibit.

In addition, the emitting layer 1062 furthermore a HIL 1080 between the first electrode 1060 and the HTL 1082 and an EIL 1096 between the ETL 1094 under second electrode 1064 exhibit.

Furthermore, the emitting layer 1062 also an EBL 1086 between the EML 1090 and the HTL 1082 and a HBL 1092 between the EML 1090 and the ETL 1094 exhibit.

Furthermore, the emitting layer 1062 also an auxiliary HTL 1084 between the HTL 1082 and the EBL 1086 exhibit. The auxiliary HTL 1084 can be a first auxiliary HTL 1084a in the first pixel area P1 , a second auxiliary HTL 1084b in the second pixel area P2 and a third auxiliary HTL 1084c in the third pixel area P3 exhibit.

The first auxiliary HTL 1084a has a first thickness, the second auxiliary HTL 1084b has a second thickness, and the third auxiliary HTL 1084c has a third thickness. The first thickness is smaller than the second thickness and larger than the third thickness, such that the OLED D5 provides a microcavity structure.

In particular, by means of the first auxiliary HTL to the third auxiliary HTL 1084a , 1084b and 1084c having a difference in thickness, a distance between the first electrode 1060 and the second electrode 1064 in the first pixel area P1 , in which light of a first wavelength range, for example green light, is emitted, is smaller than a distance between the first electrode 1060 and the second electrode 1064 in the second pixel area P2 , in which light of a second wavelength range, for example red light, which is larger than the first wavelength range, is emitted, and is larger than a distance between the first electrode 1060 and the second electrode 1064 in the third pixel area P3 , in which light of a third wavelength range, for example blue light, which is lower than the first wavelength range, is emitted. The emission yield of the OLED is accordingly D5 improved.

In 10 is the third auxiliary HTL 1084 in the third pixel area P3 educated. Alternatively, a microcavity structure without the third auxiliary HTL 1084c be provided.

A capping layer (not shown) for improving a light extraction property may further be provided on the second electrode 1084 be educated.

The EML 1090 assigns a first EML 1090a in the first pixel area P1 , a second EML 1090b in the second pixel area P2 and a third EML 1090c in the third pixel area P3 on. The first EML to the third EML 1090a , 1090b and 1090c can be a green EML, a red EML or a blue EML.

The first EML 1090a in the first pixel area P1 has the first compound, which is the delayed fluorescent compound, and the second compound, which is the fluorescent compound. The first EML 1090a in the first pixel area P1 may further comprise a third compound that is a host. The first compound is shown using Formula 1 and the second compound is shown using Formula 3.

In the first EML 1090a in the first pixel area P1 For example, the weight ratio of the first compound can be greater than that of the second compound and less than that of the third compound. When the weight ratio of the first connection is larger than that of the second connection, the energy transfer from the first connection to the second connection is sufficiently generated. For example, in the first EML 1090a in the first pixel area P1 the first compound can have a weight% of about 20 to 40, the second compound can have a weight% of about 0.1 to 5, and the third compound can have a weight% of about 60 to 75. However, it is not limited to this.

Both the second EML 1090b in the second pixel area P2 as well as the third EML 1090c in the third pixel area P3 can include a host and a dopant. For example, in both the second EML 1090b in the second pixel area P2 as well as the third EML 1090c in the third pixel area P3 the dopant comprises at least one of a phosphorescent compound, a fluorescent compound, and a delayed fluorescent compound.

The OLED D5 in 5 emits the green light, the red light and the blue light in the first pixel area, respectively P1 to third pixel area P3 such that the organic light emitting display device 1000 (the 9 ) can provide a full color image.

The organic light emitting display device 1000 can further include a color filter layer that the first pixel area P1 to third pixel area P3 to improve color purity. For example, the color filter layer can be a first color filter layer, for example a green color filter layer, which forms the first pixel area P1 corresponds to a second color filter layer, for example a red color filter layer, which corresponds to the second pixel area P2 and a third color filter layer, for example a blue color filter layer, which corresponds to the third pixel area P3 corresponds to have.

In the bottom emission type organic light emitting display device 1000 can be the color filter layer between the OLED D5 and the substrate 1010 be arranged. On the other hand, in the top emission type organic light emitting display device 1000 the color filter layer on or above the OLED D5 be arranged.

11 FIG. 12 is a schematic cross-sectional view of an organic light emitting display device according to an eighth embodiment of the present disclosure.

As in 11 shown, comprises the organic light emitting display device 1100 a substrate 1110 , in which a first pixel area to a third pixel area P1 , P2 and P3 are defined, a TFT Tr above the substrate 1110 and an OLED D disposed over the TFT Tr and connected to the TFT Tr, and a color filter layer 1120 that corresponds to the first pixel area P1 to third pixel area P3 corresponds to. For example, the first pixel area to the third pixel area P1 , P2 and P3 be a green pixel area, a red pixel area and a blue pixel area, respectively.

The substrate 1110 can be a glass substrate or a flexible substrate. For example, the flexible substrate can be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate.

The TFT Tr is on the substrate 1110 educated. Alternatively, a buffer layer (not shown) can be placed on the substrate 1110 and the TFT Tr can be formed on the buffer layer.

How with 2 As explained, the TFT Tr may include a semiconductor layer, a gate electrode, a source electrode, and a drain electrode, and can serve as a driving element.

Also is the color filter layer 1120 on the substrate 1110 arranged. For example, the color filter layer 1120 a first color filter layer 1122 that corresponds to the first pixel area P1 corresponds to a second color filter layer 1124 belonging to the second pixel area P2 and a third color filter layer 1126 that corresponds to the third pixel area P3 corresponds to have. The first color filter layer to the third color filter layer 1122 , 1124 and 1126 can be a green color filter layer, a red color filter layer or a blue color filter layer. For example, the first color filter layer 1122 comprise at least one of a green dye and a green color pigment, and the second color filter layer 1124 may have at least one of a red dye and a red pigment. The third color filter layer 1126 may include at least one of a blue dye and a blue color pigment.

A planarization layer (or passivation layer) 1150 is on the TFT Tr and the color filter layer 1120 educated. The planarization layer 1150 has a flat top surface and has a drain contact hole 1152 exposing the drain electrode of the TFT Tr.

The OLED D is on the planarization layer 1150 arranged and corresponds to the color filter layer 1120 . The OLED D has a first electrode 1160 , an emissive layer 1162 and a second electrode 1164 on. The first electrode 1160 is connected to the drain electrode of the TFT Tr, and the emitting layer 1162 and the second electrode 1164 are consecutively on the first electrode 1160 stacked. The OLED D emits white light in each of the first pixel area P1 through third pixel area P3 .

The first electrode 1160 is such in the first pixel area P1 to third pixel area P3 formed so that it is separated, and the second electrode 1164 is formed in one piece in such a way that it forms the first pixel area P1 to third pixel area P3 covered.

The first electrode 1160 is one of an anode and a cathode, and the second electrode 1164 is the other of the anode and the cathode. In addition, the first electrode 1160 be a translucent electrode (or a semi-translucent electrode), and the second electrode 1164 can be a reflective electrode.

For example, the first electrode 1160 be the anode and may be a translucent conductive oxide material layer formed from a translucent conductive oxide (TCO) material that has a relatively high work function. The second electrode 1164 may be the cathode and may be a metal material layer formed from a low resistance metal material having a relatively low work function. For example, the transparent conductive oxide material layer has the first electrode 1160 at least one of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium copper oxide (ICO) and aluminum-zinc-oxide alloy (Al: ZnO), and the second electrode 1164 can include Al, Mg, Ca, Ag, their alloy, for example Mg-Ag alloy, or their combination.

The emitting layer 1162 as an emitting unit is on the first electrode 1160 educated. The emitting layer 1162 has at least two emitting parts that emit light of different colors. Each emitting part can have a single layer structure of an EML. Alternatively, each emitting part may further include at least one of an HIL, an HTL, an EBL, an HBL, an ETL, and an EIL. In addition, the emitting layer 1162 furthermore have a charge generation layer (CGL) between the emitting parts.

The EML of one of the emitting parts has the first compound of formula 1 and the second compound of formula 3. For example, the EML of one of the emitting parts may have the first compound which is the delayed fluorescent compound and the second compound which is the fluorescent compound. The EML from one of the emitting parts can further comprise a third connection that is a host.

A layer of dam 1166 is on the planarization layer 1150 formed such that it is an edge of the first electrode 1160 covered. In particular is the dam layer 1166 at a boundary of the first pixel area P1 through third pixel area P3 arranged and lays a center of the first electrode 1160 in the first pixel area P1 to third pixel area P3 free. As mentioned above, since the OLED D can be in the first pixel area P1 to third pixel area P3 emits white light, the emitting layer 1162 as a common layer in the first pixel area P1 to third pixel area P3 be formed without entering the first pixel area P1 to third pixel area P3 to be divided. The perineum layer 1166 can be formed in such a way that it can leak the current at an edge of the first electrode 1160 prevented and can be omitted.

Although not shown, the organic light emitting display device may 1100 furthermore an encapsulation layer, which is used to prevent moisture from penetrating into the OLED D, on the second electrode 1164 is formed have. In addition, the organic light emitting display device can 1100 furthermore a polarizing plate under the substrate 1110 to reduce reflection from ambient light.

In the organic light emitting display device 1100 the 11 is the first electrode 1160 a light transmissive electrode (a light transmitting electrode), and the second electrode 1164 is a reflective electrode. Also is the color filter layer 1120 between the substrate 1110 and the OLED D arranged. In particular, the organic light-emitting display device is 1100 a bottom emission type.

Alternatively, in the organic light emitting display device 1100 the first electrode 1160 be a reflective electrode, and the second electrode 1154 can be a translucent electrode (or a semi-translucent electrode). In this case the color filter layer is 1120 arranged on or above the OLED D.

In the organic light emitting display device 1100 emits the OLED D in the first pixel area P1 to third pixel area P3 white light, and the white light passes through the first color filter layer to the third color filter layer 1122 , 1124 and 1126 through. Accordingly, the green light, the red light and the blue light become in the first pixel area, respectively P1 to third pixel area P3 displayed.

Although not shown, a color conversion layer may be between the OLED D and the color filter layer 1120 be educated. The color conversion layer can be a green color conversion layer, a red color conversion layer and a blue color conversion layer, respectively, which form the first pixel area P1 to third pixel area P3 and the white light from the OLED D can be converted into the green light, the red light, and the blue light. The color conversion layer may have a quantum dot. Accordingly, the color purity of the OLED D can be further improved.

The color conversion layer can be used in place of the color filter layer 1120 be included.

12th FIG. 3 is a schematic cross-sectional view of an OLED according to a ninth embodiment of the present disclosure.

As in 12th shown, the OLED D6 the first electrode 1160 and the second electrode 1164 facing each other, and in between the emissive layer 1162 on.

The first electrode 1160 can be an anode, and the second electrode 1164 can be a cathode. The first electrode 1160 is a transparent electrode (a light transmitting electrode), and the second electrode 1164 is a reflective electrode.

The emitting layer 1162 has a first emitting part 1210 having a first EML 1220 has a second emitting part 1230 having a second EML 1240 and a third emitting part 1250 who is a third EML 1260 has on. In addition, the emitting layer 1162 furthermore a first CGL 1270 between the first emitting part 1210 and the second emitting part 1230 and a second CGL 1280 between the first emitting part 1210 and the third emitting part 1250 exhibit.

The first CGL 1270 is between the first emitting part 1210 and the second emitting part 1230 arranged, and the second CGL 1280 is between the first emitting part 1210 and the third emitting part 1250 arranged. In particular, the third emitting part 1250 , the second CGL 1280 , the first emitting part 1210 , the first CGL 1270 and the second emitting part 1230 one after the other on the first electrode 1160 stacked. In other words, the first is the emitting part 1210 between the first CGL 1270 and the second CGL 1280 arranged, and the second emitting part 1230 is between the first CGL 1270 and the second electrode 1164 arranged. The third emitting part 1250 is between the second CGL 1280 and the first electrode 1160 arranged.

The first emitting part 1210 can also do a first HTL 1210a under the first EML 1220 and a first ETL 1210b above the first EML 1220 exhibit. In particular, the first HTL 1210a between the first EML 1220 and the second CGL 1270 be arranged, and the first ETL 1210b can be between the first EML 1220 and the first CGL 1270 be arranged.

In addition, the first emitting part 1210 also an EBL (not shown) between the first HTL 1210a and the first EML 1220 and an HBL (not shown) between the first ETL 1210b and the first EML 1220 exhibit.

The second emitting part 1230 can also have a second HTL 1230a under the second EML 1240 , a second ETL 1230b above the second EML 1240 and an EIL 1230c on the second ETL 1230b exhibit. In particular, the second HTL 1230a between the second EML 1240 and the first CGL 1270 be arranged, and the second ETL 1230b and the EIL 1230c can between the second EML 1240 and the second electrode 1164 be arranged.

In addition, the second emitting part 1230 furthermore an EBL (not shown) between the second HTL 1230a and the second EML 1240 and an HBL (not shown) between the second ETL 1230b and the second EML 1240 exhibit.

The third emitting part 1250 can also take a third HTL 1250b under the third EML 1260 , a HIL 1250a under the third HTL 1250b and a third ETL 1250c above the third EML 1260 exhibit. In particular, the HIL 1250a and the third HTL 1250b between the first electrode 1160 and the third EML 1260 be arranged, and the third ETL 1250c can be between the third EML 1260 and the second CGL 1280 be arranged.

In addition, the third emitting part 1250 also an EBL (not shown) between the third HTL 1250b and the third EML 1260 and an HBL (not shown) between the third ETL 1250c and the third EML 1260 exhibit.

One from the first EML to the third EML 1220 , 1240 and 1260 is a green EML. Another one of the first EML to the third EML 1220 , 1240 and 1260 can be one blue EML, and the other one of the first EML through third EML 1220 , 1240 and 1260 can be a red EML.

For example, the first EML 1220 be the green EML, the second EML 1240 can be the blue EML, and the third EML 1260 can be the red EML. Alternatively, the first EML 1220 be the green EML, the second EML 1240 can be the red EML, and the third EML 1260 can be the blue EML.

The first EML 1220 has the first compound, which is the delayed fluorescent compound, and the second compound, which is the fluorescent compound. The first EML 1220 may further comprise a third compound that is a host. The first compound is shown using Formula 1 and the second compound is shown using Formula 3.

In the first EML 1220 For example, the weight ratio of the first compound can be greater than that of the second compound and less than that of the third compound. When the weight ratio of the first connection is larger than that of the second connection, the energy transfer from the first connection to the second connection is sufficiently generated. For example, in the first EML 1220 the first compound can have a weight% of about 20 to 40, the second compound can have a weight% of about 0.1 to 5, and the third compound can have a weight% of about 60 to 75. However, it is not limited to this.

The second EML 1240 has a host and a blue dopant (or a red dopant), and the third EML 1260 comprises a host and a red dopant (or a blue dopant). For example, both in the second EML 1240 as well as the third EML 1260 the dopant comprises at least one of a phosphorescent compound, a fluorescent compound, and a delayed fluorescent compound.

The OLED D6 in the first pixel area P1 to third pixel area P3 (the 11 ) emits white light, and the white light passes through the color filter layer 1120 (the 11 ) in the first pixel area P1 to third pixel area P3 through. Accordingly, the organic light emitting display device can 1100 (the 11 ) provide a full color image.

13th FIG. 12 is a schematic cross-sectional view of an OLED according to a tenth embodiment of the present disclosure.

As in 13th shown, the OLED D7 the first electrode 1360 and the second electrode 1364 facing each other, and in between the emissive layer 1362 on.

The first electrode 1360 can be an anode, and the second electrode 1364 can be a cathode. The first electrode 1360 is a transparent electrode (a light transmitting electrode), and the second electrode 1364 is a reflective electrode.

The emitting layer 1362 has a first emitting part 1410 having a first EML 1420 has a second emitting part 1430 having a second EML 1440 and a third emitting part 1450 who is a third EML 1460 has on. In addition, the emitting layer 1362 furthermore a first CGL 1470 between the first emitting part 1410 and the second emitting part 1430 and a second CGL 1480 between the first emitting part 1410 and the third emitting part 1450 exhibit.

The first emitting part 1420 has a lower EML 1420a and a top EML 1420b on. In particular, the lower EML is 1420a closer to the first electrode 1360 arranged, and the top EML 1420b is closer to the second electrode 1364 arranged.

The first CGL 1470 is between the first emitting part 1410 and the second emitting part 1430 arranged, and the second CGL 1480 is between the first emitting part 1410 and the second emitting part 1450 arranged. In particular, the third emitting part 1450 , the second CGL 1480 , the first emitting part 1410 , the first CGL 1470 and the second emitting part 1430 one after the other on the first electrode 1360 stacked. In other words, the first is the emitting part 1410 between the first CGL 1470 and the second CGL 1480 arranged, and the second emitting part 1430 is between the first CGL 1470 and the second electrode 1364 arranged. The third emitting part 1450 is between the second CGL 1480 and the first electrode 1360 arranged.

The first emitting part 1410 can also do a first HTL 1410a under the first EML 1420 and a first ETL 1410b above the first EML 1420 exhibit. In particular, the first HTL 1410a between the first EML 1420 and the second CGL 1470 be arranged, and the first ETL 1410b can be between the first EML 1420 and the first CGL 1470 be arranged.

In addition, the first emitting part 1410 also an EBL (not shown) between the first HTL 1410a and the first EML 1420 and an HBL (not shown) between the first ETL 1410b and the first EML 1420 exhibit.

The second emitting part 1430 can also have a second HTL 1430a under the second EML 1440 , a second ETL 1430b above the second EML 1440 and an EIL 1430c on the second ETL 1430b exhibit. In particular, the second HTL 1430a between the second EML 1440 and the first CGL 1470 be arranged, and the second ETL 1430b and the EIL 1430c can between the second EML 1440 and the second electrode 1364 be arranged.

In addition, the second emitting part 1430 furthermore an EBL (not shown) between the second HTL 1430a and the second EML 1440 and an HBL (not shown) between the second ETL 1430b and the second EML 1440 exhibit.

The third emitting part 1450 can also take a third HTL 1450b under the third EML 1460 , a HIL 1450a under the third HTL 1450b and a third ETL 1450c above the third EML 1460 exhibit. In particular, the HIL 1450a and the third HTL 1450b between the first electrode 1360 and the third EML 1460 be arranged, and the third ETL 1054c can be between the third EML 1460 and the second CGL 1480 be arranged.

In addition, the third emitting part 1450 also an EBL (not shown) between the third HTL 1450b and the third EML 1460 and an HBL (not shown) between the third ETL 1450c and the third EML 1460 exhibit.

One of the lower EML 1420a and the top EML 1420b the first EML 1420 is one green EML, and the other is the lower EML 1024a and the top EML 1024b the first EML 1420 can be a red EML on. In particular, the green EML (or the red EML) and the red EML (or the green EML) are for forming the first EML 1420 stacked one after the other.

For example, the top EML 1420b , which is the green EML, the first compound which is the Delayed Fluorescent Compound, and the second compound which is the fluorescent compound. The top EML 1420b may further comprise a third compound that is a host. The first compound is shown using Formula 1 and the second compound is shown using Formula 3.

In the upper EML 1420b For example, the weight ratio of the first compound can be greater than that of the second compound and less than that of the third compound. When the weight ratio of the first connection is larger than that of the second connection, the energy transfer from the first connection to the second connection is sufficiently generated. For example, in the upper EML 1420b the first compound can have a weight% of about 20 to 40, the second compound can have a weight% of about 0.1 to 5, and the third compound can have a weight% of about 60 to 75. However, it is not limited to this.

The lower EML 1420a , which is the red EML, can have a host and a red dopant.

Both the second EML 1440 as well as the third EML 1460 can be a blue EML. Both the second EML 1440 as well as the third EML 1460 can include a host and a blue dopant. The host and dopant of the second EML 1440 can be the same as the host and dopant of the third EML 1460 . Alternatively, the host and dopant can be the second EML 1440 be different from the host and dopant of the third EML 1460 . For example, the dopant in the second EML 1440 a difference in the emission efficiency and / or the wavelength of the emitted light from the dopant in the third EML 1460 exhibit.

In each of the lower EML 1420a , the second EML 1440 and the third EML 1460 the dopant may include at least one of a phosphorescent compound, a fluorescent compound, and a delayed fluorescent compound.

The OLED D7 in the first pixel area P1 to third pixel area P3 (the 11 ) emits white light, and the white light passes through the color filter layer 1120 (the 11 ) in the first pixel area P1 to third pixel area P3 through. Accordingly, the organic light emitting display device can 1100 (the 11 ) provide a full color image.

In 13th instructs the OLED D7 a three-stack (triple-stack) structure containing the second EML 1440 and the third EML 1460 who are the blue EML with the first EML 1420 having. Alternatively, one of the second EML 1440 and the third EML 1460 can be omitted such that the OLED D7 has a two-stack (double-stack) structure.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• KR 1020190130133 [0001]
• KR 1020200114590 [0001]

Claims (14)

An organic light emitting diode (D1) comprising: a first electrode (210); a second electrode (230) facing the first electrode; and an emissive material layer (240) which has a first connection and a second connection and is arranged between the first electrode (210) and the second electrode (230), the first connection being represented by Formula 1:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40-heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second compound being represented by formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring, and wherein each of X1 and X2 is independently selected from fluorine. The organic light emitting diode (D1) according to Claim 1 , wherein an energy level of a lowest unoccupied molecular orbital (LUMO) of the first compound is equal to or higher than an energy level of a LUMO of the second compound, and wherein a difference between the energy level of the LUMO of the first compound and the energy level of the LUMO of the second compound is approximately Is 0.6 eV or less. The organic light emitting diode (D1) according to Claim 1 or 2 , wherein an energy band gap of the first compound is about 2.0 to 3.0 eV. The organic light emitting diode (D1) according to one of the Claims 1 to 3 , wherein the first compound is one of compounds in Formula 3:

The organic light emitting diode (D1) according to one of the Claims 1 to 4th , wherein the second compound is one of compounds in Formula 4:

The organic light emitting diode (D1) according to one of the Claims 1 to 5 , wherein a% by weight of the first compound is greater than that of the second compound. An organic light emitting diode (D2, D3) comprising: a first electrode (310, 410); a second electrode (330, 430) facing the first electrode (310, 410); and an emissive material layer (340, 440) having a first emissive material layer (342, 442) and a second emissive material layer (344, 444) and between the first electrode (310, 410) and the second electrode (330, 430) is arranged, wherein the first emitting material layer (342, 442) has a first compound according to formula 1:

where n is an integer from 1 to 4, where each of R1 and R2 is independently selected from the group consisting of hydrogen, deuterium, tritium, a C1- to C20-alkyl, a C6- to C30-aryl and a C3- to C40-heteroaryl, or adjacent two of R1 and / or adjacent two of R2 are connected in such a way that they form a fused ring, the second emitting material layer (344, 444) being between the first emitting material layer ( 342, 442) and the first electrode (310, 410) or the second electrode (330, 430) and has a second compound according to formula 2:

wherein each of R11 to R17 is selected from the group consisting of hydrogen, deuterium, tritium, a C1 to C20 alkyl, a C6 to C30 aryl, and a C3 to C40 heteroaryl, or adjacent two of R11 to R17 are linked to form a fused ring and wherein each of X1 and X2 is independently selected from fluorine. The organic light emitting diode (D2, D3) according to Claim 7 , wherein an energy level of a lowest unoccupied molecular orbital, LUMO, of the first compound is equal to or higher than an energy level of a LUMO of the second compound, and wherein a difference between the energy level of the LUMO of the first compound and the energy level of the LUMO of the second compound is approximately Is 0.6 eV or less. The organic light emitting diode (D2, D3) according to Claim 7 or 8th , wherein an energy band gap of the first compound is about 2.0 to 3.0 eV. The organic light emitting diode (D2, D3) according to one of the Claims 7 to 9 , wherein the first compound is one of compounds in Formula 3:

The organic light emitting diode (D2, D3) according to one of the Claims 7 to 10 , wherein the second compound is one of compounds in Formula 4:

The organic light emitting diode (D2, D3) according to one of the Claims 7 to 11 wherein a weight% of the first compound in the first emissive material layer (342, 442) is greater than that of the second compound in the second emissive material layer (344, 444). The organic light emitting diode (D2, D3) according to one of the Claims 7 to 12th wherein the emissive material layer (440) further comprises a third emissive material layer (446) having the second connection and is arranged between the second electrode (430) and the first emissive material layer (442), having. An organic light emitting device comprising: a substrate; and an organic light emitting diode (D) according to any one of Claims 1 to 13th , which is arranged on or above the substrate.

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