US 12,274,123 B2
Light emitting device and display apparatus including the same
Jimyoung Ye, Suwon-si (KR); Seulong Kim, Cheonan-si (KR); Hajin Song, Hwaseong-si (KR); Jihwan Yoon, Yongin-si (KR); Hyekyun Lee, Seoul (KR); Dongseob Jeong, Suwon-si (KR); and Jaehoon Hwang, Seoul (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Feb. 2, 2022, as Appl. No. 17/591,091.
Claims priority of application No. 10-2021-0044185 (KR), filed on Apr. 5, 2021.
Prior Publication US 2022/0320467 A1, Oct. 6, 2022
Int. Cl. H01L 33/00 (2010.01); H10K 50/13 (2023.01); H10K 50/852 (2023.01); H10K 59/38 (2023.01); H10K 101/00 (2023.01)
CPC H10K 50/852 (2023.02) [H10K 50/131 (2023.02); H10K 59/38 (2023.02); H10K 2101/27 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a first electrode;
a hole transport region disposed on the first electrode;
a first emission layer disposed on the hole transport region, and which emits light of a first wavelength;
a second emission layer disposed on the hole transport region, and which emits light of a second wavelength different from the first wavelength;
an electron transport region disposed on the first emission layer and the second emission layer;
a second electrode disposed on the electron transport region; and
a capping layer disposed on the second electrode,
wherein an exit light is emitted from an upper surface of the capping layer,
the exit light has a maximum intensity at an azimuth angle of about 25 degrees (°) to about 35°, and
from the light with the maximum intensity among the exit light, the intensity of the exit light gradually decreases as the azimuth angle decreases or increases.
 
17. A light emitting device comprising:
a first electrode;
a hole transport region disposed on the first electrode;
a plurality of first emission layers disposed on the hole transport region, and which emits light of a first wavelength;
a second emission layer disposed on the hole transport region, and which emits light of a second wavelength different from the first wavelength;
an electron transport region disposed on the first emission layer and the second emission layer; and
a second electrode disposed on the electron transport region,
wherein a distance from an upper surface of the first electrode to a lower surface of the second electrode is defined as an optical distance, and
the optical distance is about 4200 Å to about 4350 Å.
 
18. A display apparatus comprising:
a substrate in which a first pixel area which emits light of a first wavelength, a second pixel area which emits light of a second wavelength different from the first wavelength, and a third pixel area which emits light of a third wavelength different from the first wavelength and the second wavelength are defined; and
a plurality of light emitting devices disposed on the substrate to overlap the first pixel area, the second pixel area, and the third pixel area in a plan view,
wherein the plurality of light emitting devices each include:
a first electrode;
a hole transport region disposed on the first electrode;
a first emission layer disposed on the hole transport region, and which emits light of a first wavelength;
a second emission layer disposed on the hole transport region, and which emits light of a second wavelength different from the first wavelength;
an electron transport region disposed on the first emission layer and the second emission layer;
a second electrode disposed on the electron transport region; and
a capping layer disposed on the second electrode,
wherein an exit light is emitted from an upper surface of the capping layer, the exit light has a maximum intensity at an azimuth angle of about 25° to about 35°, and
from the light with the maximum intensity among the exit light, the intensity of the exit light gradually decreases as the azimuth angle decreases or increases.