公开(公告)号：US20230209861A1

公开(公告)日：2023-06-29

申请号：US17822633

申请日：2022-08-26

Applicant: Samsung Display Co., Ltd.

Inventor： JONGWON LEE ,  DAEHYEON KIM ,  SEUNG CHEOL KIM ,  HEUNGSU PARK ,  CHANG-MIN LEE ,  HYUNSHIK LEE

IPC: H01L51/50 ,  H01L27/32

CPC classification number: H01L51/5092 ,  H01L27/3246 ,  H01L51/504 ,  H01L27/322 ,  H01L2251/301 ,  H01L2251/558

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 configured to emit light of a first wavelength, a second light emitting layer on the hole transport region and configured to emit light of a second wavelength different from the first wavelength, an electron transport region including an electron transport layer on the first light emitting layer and the second light emitting layer, and an electron injection layer on the electron transport layer, and a second electrode on the electron transport region, wherein the electron injection layer includes magnesium (Mg) and ytterbium (Yb).

公开(公告)号：US20230016588A1

公开(公告)日：2023-01-19

申请号：US17704679

申请日：2022-03-25

Applicant: Samsung Display Co., Ltd.

Inventor： HEUNGSU PARK ,  SONGEUN LEE ,  NAMSU KANG ,  JONGWON LEE ,  HYUNSHIK LEE

IPC: H01L51/00

Abstract: A light-emitting device including a first electrode, a hole transport region disposed on the first electrode, a first light-emitting layer disposed on the hole transport region and emitting light of a first wavelength, a second light-emitting layer disposed on the hole transport region and emitting light of a second wavelength different from the first wavelength, an electron transport region disposed on the first light-emitting layer and the second light-emitting layer, and a second electrode disposed on the electron transport region, wherein the second light-emitting layer includes a first sub light-emitting layer including a first host and a first dopant and emitting the light of the second wavelength, and a second sub light-emitting layer including a second host different from the first host and a second dopant and emitting the light of the second wavelength. Accordingly, a luminous efficiency and device lifetime of the light-emitting device may be improved.