Search

KR-102963054-B1 - ORGANIC LIGHT EMITTING DEVICE

KR102963054B1KR 102963054 B1KR102963054 B1KR 102963054B1KR-102963054-B1

Abstract

The present invention provides an organic light-emitting device comprising: a substrate; a first electrode; a second electrode facing the first electrode; a first light-emitting material layer located between the first electrode and the second electrode, comprising a first host which is an anthracene derivative and a first dopant which is a boron derivative; and an electron blocking layer located between the first electrode and the first light-emitting material layer, comprising an electron blocking material which is an amine derivative substituted with a heteroaryl group, wherein the anthracene core of the first host is substituted with deuterium.

Inventors

  • 윤승희
  • 송인범
  • 김상범
  • 카즈시 시렌
  • 야수유키 사사다

Assignees

  • 엘지디스플레이 주식회사
  • 에스케이머티리얼즈제이엔씨 주식회사

Dates

Publication Date
20260511
Application Date
20210517
Priority Date
20200529

Claims (18)

  1. Substrate and; The organic light-emitting diode comprises: a first electrode; a second electrode facing the first electrode; a first light-emitting material layer positioned between the first electrode and the second electrode, comprising a first host which is an anthracene derivative and a first dopant which is a boron derivative; and an electron blocking layer positioned between the first electrode and the first light-emitting material layer, comprising an electron blocking material. The anthracene core of the first host is substituted with deuterium, and the first dopant is one of the compounds of Chemical Formula 3 below, and [Chemical Formula 3] The above electron blocking material is represented by the following chemical formula 2, and [Chemical Formula 2] An organic light-emitting device characterized in that, in Chemical Formula 2, L is a C6-C30 arylene group, R1 and R2 are each a C1-C10 alkyl group or two adjacent groups form a condensed ring or two adjacent groups of R2 form a condensed ring, R3 is a C5-C30 heteroaryl group, R4 is hydrogen or a C6-C30 aryl group, a is 0 or 1, b is an integer from 0 to 4, and c is an integer from 0 to 5.
  2. delete
  3. In Article 1, The above first host is represented by the following chemical formula 4, and An organic light-emitting device characterized in that R1 and R2 are each independently an aryl group of C6 to C30 or a heteroaryl group of C5 to C30, L1 and L2 are each an arylene group of C6 to C30, x is an integer from 1 to 8, and y1 and y2 are each an integer of 0 or 1. [Chemical Formula 4]
  4. In Paragraph 3, An organic light-emitting device characterized in that the first host is one of the compounds of Chemical Formula 5 below. [Chemical Formula 5]
  5. In Article 1, An organic light-emitting device characterized in that the above electron blocking material is one of the compounds of Chemical Formula 6 below. [Chemical Formula 6]
  6. In Article 1, The above organic light-emitting diode further includes a hole blocking layer located between the second electrode and the first light-emitting material layer, and The above hole blocking layer comprises at least one of a first hole blocking material of the following chemical formula 7 and a second hole blocking material of the following chemical formula 8, in an organic light-emitting device. [Chemical Formula 7] [Chemical Formula 8] (In Chemical Formula 7, each of Y1 to Y5 is independently CR1 or N, of which one to three are N, R1 is independently hydrogen or a C6-C30 aryl group, L is a C6-C30 allylene group, R2 is a C6-C50 aryl group or a C5-C50 heteroaryl group, R3 is a C1-C10 alkyl group or two adjacent groups form a condensed ring, a is 0 or 1, b is 1 or 2, and c is an integer from 0 to 4, In Chemical Formula 8, Ar is a C10–C30 arylene group, R81 is an unsubstituted or C6–C30 aryl group substituted with a C1–C10 alkyl or a C5–C30 heteroaryl group substituted with a C1–C10 alkyl, and R82 and R83 are each independently hydrogen, a C1–C10 alkyl, or a C6–C30 aryl.
  7. In Article 6, An organic light-emitting device characterized in that the first hole-blocking material is one of the compounds of the following chemical formula 9. [Chemical Formula 9]
  8. In Article 6, An organic light-emitting device characterized in that the second hole-blocking material is one of the compounds of Chemical Formula 10 below. [Chemical Formula 10]
  9. In Article 1, The organic light-emitting diode further comprises a second light-emitting material layer located between the first light-emitting material layer and the second electrode, the second host being an anthracene derivative and the second dopant being a boron derivative; and a first charge-generating layer located between the first light-emitting material layer and the second light-emitting material layer. An organic light-emitting device characterized in that the anthracene core of the second host is substituted with deuterium.
  10. In Article 1, An organic light-emitting diode characterized by further comprising: a second light-emitting material layer that emits blue light and is located between the first light-emitting material layer and the second electrode; and a first charge-generating layer located between the first light-emitting material layer and the second light-emitting material layer.
  11. In any one of Article 1, Article 9, or Article 10, A red pixel, a green pixel, and a blue pixel are defined on the substrate, and the organic light-emitting diode corresponds to the red pixel, the green pixel, and the blue pixel. An organic light-emitting device characterized by further including a color conversion layer provided between the substrate and the organic light-emitting diode or on top of the organic light-emitting diode, corresponding to the red pixel and the green pixel.
  12. In Article 9, An organic light-emitting diode characterized by further including a third light-emitting material layer located between the first charge generating layer and the second light-emitting material layer, and a second charge generating layer located between the second light-emitting material layer and the third light-emitting material layer, which emits a yellow-green color.
  13. In Article 9, An organic light-emitting diode characterized by further including a third light-emitting material layer located between the first charge generating layer and the second light-emitting material layer, and a second charge generating layer located between the second light-emitting material layer and the third light-emitting material layer, which emit red and green light.
  14. In Article 9, An organic light-emitting diode characterized by comprising a first layer emitting red light and a second layer emitting yellow-green light, a third light-emitting material layer located between the first charge generating layer and the second light-emitting material layer, and a second charge generating layer located between the second light-emitting material layer and the third light-emitting material layer.
  15. In Article 14, An organic light-emitting device characterized in that the above-mentioned third light-emitting material layer further includes a third layer that emits green light.
  16. In Article 1, An organic light-emitting diode characterized by further including a second light-emitting material layer located between the first light-emitting material layer and the second electrode, and a first charge-generating layer located between the first light-emitting material layer and the second light-emitting material layer, wherein the organic light-emitting diode emits a yellow-green color.
  17. In any one of paragraphs 12 to 16, A red pixel, a green pixel, and a blue pixel are defined on the substrate, and the organic light-emitting diode corresponds to the red pixel, the green pixel, and the blue pixel. An organic light-emitting device characterized by further including a color filter layer provided between the substrate and the organic light-emitting diode or on top of the organic light-emitting diode, corresponding to the red pixel, the green pixel, and the blue pixel.
  18. In Article 1, An organic light-emitting device characterized in that the first host is one of the compounds of Chemical Formula 11, the first dopant is a compound of Chemical Formula 12, and the electron blocking material is one of the compounds of Chemical Formula 13. [Chemical Formula 11] [Chemical Formula 12] [Chemical Formula 13]

Description

Organic Light Emitting Device The present invention relates to an organic light-emitting device, and more specifically, to an organic light-emitting diode and an organic light-emitting device having high luminous efficiency and lifespan. With the recent increase in the size of display devices, there is a growing demand for flat display devices that take up less space, and as one such flat display device, the technology of organic light-emitting diodes (OLEDs) is developing rapidly. An organic light-emitting diode (OLED) is a device that emits light when electrons and holes are injected from the cathode and anode into a light-emitting material layer formed between the electron injection electrode (cathode) and the hole injection electrode (anode), and subsequently annihilate each other. It has the advantages of being able to be formed on flexible transparent substrates such as plastic, operating at low voltages (below 10V), consuming relatively little power, and offering excellent color quality. The organic light-emitting diode includes a first electrode formed on a substrate and being an anode, a second electrode spaced apart from and facing the first electrode, and an organic light-emitting layer located between the first electrode and the second electrode. For example, an organic light-emitting display device includes red pixels, green pixels, and blue pixels, and an organic light-emitting diode is formed in each pixel. However, blue organic light-emitting diodes cannot achieve sufficient luminous efficiency and lifespan, and consequently, organic light-emitting display devices also have limitations in luminous efficiency and lifespan. FIG. 1 is a schematic circuit diagram of an organic light-emitting display device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of an organic light-emitting display device according to a first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of an organic light-emitting diode used in an organic light-emitting display device according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a double-stack structured organic light-emitting diode used in an organic light-emitting display device according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of an organic light-emitting display device according to a second embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a double-stack structured organic light-emitting diode used in an organic light-emitting display device according to a second embodiment of the present invention. FIG. 7 is a schematic cross-sectional view of a triple-stack structured organic light-emitting diode used in an organic light-emitting display device according to a second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of an organic light-emitting display device according to a third embodiment of the present invention. Hereinafter, preferred embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic circuit diagram of an organic light-emitting display device according to an embodiment of the present invention. As illustrated in FIG. 1, in an organic light-emitting display device, gate wiring (GL), data wiring (DL), and power wiring (PL) are formed intersecting each other to define a pixel area (P), and in the pixel area (P), a switching thin-film transistor (Ts), a driving thin-film transistor (Td), a storage capacitor (Cst), and an organic light-emitting diode (D) are formed. The pixel area (P) may include a red pixel area, a green pixel area, and a blue pixel area. The switching thin-film transistor (Ts) is connected to the gate wiring (GL) and data wiring (DL), and the driving thin-film transistor (Td) and storage capacitor (Cst) are connected between the switching thin-film transistor (Ts) and the power wiring (PL). The organic light-emitting diode (D) is connected to the driving thin-film transistor (Td). In this organic light-emitting display device, when the switching thin-film transistor (Ts) is turned on according to the gate signal applied to the gate wiring (GL), the data signal applied to the data wiring (DL) is applied to the gate electrode of the driving thin-film transistor (Td) and one electrode of the storage capacitor (Cst) through the switching thin-film transistor (Ts). The driving thin-film transistor (Td) is turned on according to a data signal applied to the gate electrode, and as a result, a current proportional to the data signal flows from the power wiring (PL) through the driving thin-film transistor (Td) to the organic light-emitting diode (D), and the organic light-emitting diode (D) emits light with a brightness proportional to the current flowing through the driving thin-film transistor (Td). At this time, the storage capacitor (Cst) is cha