公开(公告)号：US20220336766A1

公开(公告)日：2022-10-20

申请号：US17575583

申请日：2022-01-13

Applicant: Samsung Display Co., Ltd.

Inventor： JIMYOUNG YE ,  SEULONG KIM ,  HYEKYUN LEE ,  HAJIN SONG ,  JIHWAN YOON ,  DONGSEOB JEONG ,  JAEHOON HWANG

IPC: H01L51/50

Abstract: A light emitting devices includes a first electrode, a hole transport region on the first electrode, a first emission layer on the hole transport region, the first emission layer to emit light of a first wavelength, a second emission layer on the hole transport region and to emit light of a second wavelength, an electron transport region on the first and second emission layers, and a second electrode on the electron transport region. The first emission layer includes a first sub-emission layer including a first hole transport host and a first sub-dopant to emit the light of the first wavelength, and a second sub-emission layer including a first electron transport and a second sub-dopant to emit the light of the first wavelength. The second emission layer includes a second hole transport host, a second electron transport host, and a second dopant to emit the light of the second wavelength.

公开(公告)号：US20230084087A1

公开(公告)日：2023-03-16

申请号：US17745604

申请日：2022-05-16

Applicant: Samsung Display Co., Ltd.

Inventor： JUNGHO CHOI ,  PILGU KANG ,  SEULONG KIM ,  HAJIN SONG ,  DONGSEOB JEONG ,  YANG-JIN CHO

IPC: H01L51/50 ,  H01L27/32

Abstract: Provided is a light emitting device including a first electrode, a hole transport region on the first electrode, a first light emitting layer on the hole transport region and emitting light of a first wavelength, a second light emitting layer on the hole transport region and emitting light of a second wavelength different from the first wavelength, an electron transport region on the first light emitting layer and the second light emitting layer, and a second electrode on the electron transport region. The second light emitting layer includes a first sub-light emitting layer including a first host having a first hole transporting host and a first electron transporting host and a dopant emitting light of the second wavelength, and a second sub-light emitting layer including a second host and a second hole transporting host, but not including the dopant. The light emitting device provides improved light emitting efficiency.

公开(公告)号：US20220320467A1

公开(公告)日：2022-10-06

申请号：US17591091

申请日：2022-02-02

Applicant: Samsung Display Co., Ltd.

Inventor： JIMYOUNG YE ,  SEULONG KIM ,  HAJIN SONG ,  JIHWAN YOON ,  HYEKYUN LEE ,  DONGSEOB JEONG ,  JAEHOON HWANG

IPC: H01L51/52 ,  H01L27/32 ,  H01L51/50

Abstract: A light emitting device includes: 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. In exit light emitted to an upper surface of the capping layer, the exit light has a maximum intensity at an azimuth angle of about 25° to about 35°.