公开(公告)号：US20230171984A1

公开(公告)日：2023-06-01

申请号：US17851668

申请日：2022-06-28

Applicant: Samsung Display Co., Ltd.

Inventor： Jinwoo PARK ,  Boobae KIM ,  Seokjae LEE ,  Jaejin LEE

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

CPC classification number: H01L51/5056 ,  H01L51/5072 ,  H01L27/3218 ,  H01L51/5275 ,  H01L51/5092 ,  H01L27/3244

Abstract: A light-emitting device includes a first electrode; a second electrode facing the first electrode; m emitting parts located between the first electrode and the second electrode; and m−1 charge generation layers. A first hole transport region included in a first emitting part among the m emitting parts includes a first hole transport material, a second hole transport region included in a second emitting unit among the m emitting parts includes a second hole transport material, and a refractive index of the first hole transport material is greater than a refractive index of the second hole transport material.