Organic light emitting diode and organic light emitting device including the same

Patent metadata

Field	Value
Publication number	US-12543497-B2
Application number	US-202117470807-A
Country	US
Kind code	B2
Filing date	Sep 9, 2021
Priority date	Sep 11, 2020
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

An organic light emitting diode includes a first electrode; a second electrode facing the first electrode; and an emitting material layer including a first compound, a second compound and a third compound and positioned between the first and second electrodes. An energy level of the first to third compounds satisfies a pre-determined condition. An organic light emitting device may include the organic light emitting diode.

First claim

What is claimed is:

1 . An organic light emitting diode, comprising:
a first electrode; a second electrode facing the first electrode; and a first emitting material layer including a first compound, a second compound and a third compound and positioned between the first and second electrodes, wherein the first compound is represented by Formula 1:

wherein A is selected from the group consisting of C6 to C30 arylene and C5 to C30 heteroarylene, and each of R1 to R4 is independently selected from the group consisting of hydrogen (H), deuterium (D), halogen, cyano, silyl, C1 to C20 alkyl, C6 to C30 aryl, C5 to C30 heteroaryl and C1 to C20 amine,
wherein the second compound is represented by Formula 2:

wherein,
X is CR18 or N, wherein R18 is selected from the group consisting of H, C1 to C20 alkyl and C6 to C30 aryl,
each of R11 and R12 is independently selected from the group consisting of C6 to C30 aryl, C5 to C30 heteroaryl and C1 to C20 amine, and
each of R13, R14, R15, R16 and R17 is independently selected from the group consisting of H, D, C6 to C30 aryl, C5 to C30 heteroaryl and C1 to C20 amine, or any two adjacent groups are joined to form a fused ring, and
wherein the third compound is represented by Formula 3:

wherein each of R31, R32, R33, R34, R35, R36, R37 and R38 is independently selected from the group consisting of H, D, C1 to C20 alkyl, C6 to C30 aryl and C5 to C30 heteroaryl, or any two adjacent groups are connected to form a fused ring,
wherein the first emitting material layer further includes a fourth compound represented by Formula 7,

wherein each of R41, R42, R43, R44, R45, R45, R46 and R47 is independently selected from the group consisting of H, D, C1 to C20 alkyl, C6 to C30 aryl and C5 to C30 heteroaryl, or any two adjacent groups are joined to form a fused ring,
wherein the first emitting material layer includes a first layer and a second layer, and the second layer is positioned between the first layer and the second electrode, and
wherein the second layer includes the first to third compound, and the first layer includes the fourth compound and a first host, and
wherein the first emitting material layer further includes a third layer including the fourth compound and a second host and positioned between the second layer and the second electrode.

2 . The organic light emitting diode according to claim 1 , wherein the first compound is one of compounds in Formula 4:

3 . The organic light emitting diode according to claim 1 , wherein the second compound is one of compounds in Formula 5:

4 . The organic light emitting diode according to claim 1 , wherein the third compound is one of compounds in Formula 6:

5 . The organic light emitting diode according to claim 1 , wherein a difference between a LUMO energy level of the first compound and a LUMO energy level of the second compound is in a range of 0.2 eV to 0.4 eV, and a difference between the LUMO energy level of second compound and a LUMO energy level of the third compound is equal to or less than 1.1 eV.

6 . The organic light emitting diode according to claim 1 , wherein the fourth compound is one of compounds in Formula 8:

7 . The organic light emitting diode according to claim 1 , further comprising a hole blocking layer between the second electrode and the third layer, wherein the hole blocking layer includes a same material as the second host.

8 . The organic light emitting diode according to claim 1 , further comprising an electron blocking layer between the first electrode and the first layer, wherein the electron blocking layer includes a same material as the first host.

9 . The organic light emitting diode according to claim 1 , further comprising:
a second emitting material layer between the first electrode and the first emitting material layer; and a charge generation layer between the first and second emitting material layers, wherein the second emitting material layer is one of a red emitting material layer, a green emitting material layer and a blue emitting material layer.

10 . An organic light emitting device, comprising:
a substrate; and an organic light emitting diode according to claim 1 and disposed on or over the substrate.

11 . The organic light emitting device according to claim 10 , wherein the first compound is one of compounds in Formula 4:

12 . The organic light emitting device according to claim 10 , wherein the second compound is one of compounds in Formula 5:

13 . The organic light emitting device according to claim 10 , wherein the third compound is one of compounds in Formula 6:

14 . The organic light emitting device according to claim 10 , wherein a difference between a LUMO energy level of the first compound and a LUMO energy level of the second compound is in a range of 0.2 eV to 0.4 eV, and a difference between the LUMO energy level of second compound and a LUMO energy level of the third compound is equal to or less than 1.1 eV.

15 . An organic light emitting diode comprising
a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first compound, a second compound and a third compound and positioned between the first and second electrodes; and a hole blocking layer between the second electrode and the second layer, wherein the first compound is represented by Formula 1:

wherein A is selected from the group consisting of C6 to C30 arylene and C5 to C30 heteroarylene, and each of R1 to R4 is independently selected from the group consisting of hydrogen (H), deuterium (D), halogen, cyano, silyl, C1 to C20 alkyl, C6 to C30 aryl, C5 to C30 heteroaryl and C1 to C20 amine,
wherein the second compound is represented by Formula 2:

Assignees

• Lg Display Co Ltd

Inventors

• Lee Ji-Ae
• Seo Bo-Min
• Kim Jun-Yun

Classifications

• H10K2101/90

  Multiple hosts in the emissive layer · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title

• H10K2101/30

  Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values · CPC title

• H10K2101/20

  Delayed fluorescence emission · CPC title

• H10K50/181

  Electron blocking layers · CPC title