IP Library › Granted Patent US 12,274,117
Granted Patent B2
US 12,274,117 · App. 17/399,013 · Granted Apr 8, 2025

Light-emitting device and an electronic apparatus including same

Inventors: Tsuyoshi Naijo (Yongin-si, KR); Hyunyoung Kim (Yongin-si, KR); Hyosup Shin (Yongin-si, KR); Jiyoung Lee (Yongin-si, KR)
Assignee: Samsung Display Co., Ltd.
H10K50/18H10K50/11H10K85/322H10K85/342H10K85/346H10K85/40H10K85/654H10K85/6572H10K2101/10H10K2101/27H10K2101/30H10K2101/90
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Quick Facts
Patent No.
US 12,274,117
App. No.
17/399,013
Granted
Apr 8, 2025
Kind
B2
Abstract

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; an interlayer located between the first electrode and the second electrode and including an emission layer; and an electron transport region located between the emission layer and the second electrode and including: a hole blocking layer; and an electron transport layer, an electron injection layer, or any combination thereof, wherein the emission layer includes a first host, a second host, a first dopant, and a second dopant, and the electron transport region includes a layer including a red dopant compound.

Claims (31)

1. A light-emitting device comprising:

a first electrode;

a second electrode facing the first electrode;

an interlayer comprising an emission layer between the first electrode and the second electrode; and

an electron transport region comprising a layer including a red dopant compound between the emission layer and the second electrode and comprising: a hole blocking layer; and an electron transport layer, an electron injection layer, or any combination thereof,

wherein the emission layer comprises a first host, a second host, a first dopant, and a second dopant.

2. The light-emitting device of claim 1 , wherein the first electrode comprises an anode, and the second electrode comprises a cathode.

3. The light-emitting device of claim 1 , wherein the first electrode comprises an anode,

the second electrode comprises a cathode, and

the interlayer further comprises a hole transport region between the first electrode and the emission layer and comprising a hole injection layer, a hole transport layer, an electron blocking layer, or any combination thereof.

4. The light-emitting device of claim 1 , wherein the emission layer is configured to emit blue light.

5. The light-emitting device of claim 1 , wherein the emission layer does not contact the layer comprising the red dopant compound.

6. The light-emitting device of claim 1 , wherein the first dopant comprises a phosphorescent dopant, and the second dopant comprises a thermally activated delayed fluorescence dopant.

7. The light-emitting device of claim 1 , wherein any one of the first dopant and the second dopant exhibits intersystem crossing more than it exhibits emission of light.

8. The light-emitting device of claim 1 , wherein the first dopant comprises a phosphorescent dopant, the second dopant comprises a thermally activated delayed fluorescence dopant, and the first dopant exhibits intersystem crossing more than it exhibits emission of light.

9. The light-emitting device of claim 1 , wherein the hole blocking layer comprises a Compound HB, and

a value of a T1 energy of the Compound HB (T 1_HB ) and a value of the T1 energy of the red dopant compound (T 1_RD ) satisfy the following Equation (1):

T 1_HB> T 1_RD  (1).

10. The light-emitting device of claim 1 , wherein the hole blocking layer comprises a Compound HB, and

the Compound HB has an absolute value of highest occupied molecular orbital energy (HOMO_ HB ) and the red dopant compound has an absolute value of highest occupied molecular orbital energy (HOMO_ RD ) that satisfy the following Equation (2):

|HOMO_ HB |>|HOMO_ RD |  (2).

11. The light-emitting device of claim 1 , wherein the hole blocking layer comprises a Compound HB, and the Compound HB has a value of a T1 energy (T 1_HB ) from about 2.5 eV to about 3.5 eV.

12. The light-emitting device of claim 1 , wherein the red dopant compound has a value of a T1 energy (T 1_RD ) from about 1.5 eV to about 2.5 eV.

13. The light-emitting device of claim 1 , wherein the first host comprises a hole transporting host, and the second host comprises an electron transporting host.

14. The light-emitting device of claim 1 , wherein the hole blocking layer comprises the layer comprising the red dopant compound.

15. The light-emitting device of claim 1 , wherein the first host comprises any one of the following compounds:

16. The light-emitting device of claim 1 , wherein the second host comprises any one of the following compounds:

17. The light-emitting device of claim 1 , wherein the first dopant comprises any one of the following compounds:

18. The light-emitting device of claim 1 , wherein the second dopant comprises any one of the following compounds:

19. The light-emitting device of claim 1 , wherein the red dopant compound comprises any one of the following compounds:

20. An electronic apparatus comprising the light-emitting device of claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 10, 2021
From: NAIJO, TSUYOSHI; KIM, HYUNYOUNG; SHIN, HYOSUP; LEE, JIYOUNG
To: SAMSUNG DISPLAY CO., LTD.
Reel/Frame 057140/0717 →
Priority Claims (1)
KR 10-2020-0175824 · Dec 15, 2020 · national
Continuity (1)
Related Publication 20220190276A1 · Jun 16, 2022
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