公开(公告)号：US20230217821A1

公开(公告)日：2023-07-06

申请号：US18078731

申请日：2022-12-09

Applicant: LG Display Co., Ltd.

Inventor： Wook Song ,  Sae Mi Park ,  Myeong Seon Cho ,  Min Hyeong Hwang ,  Chun Ki Kim ,  Jung Keun Kim ,  Byung Soo Kim ,  Young Jun Yu ,  Sang Beom Kim

IPC: H10K85/60 ,  H10K50/13 ,  C07D401/14 ,  C09K11/06 ,  C07D235/18 ,  C07D235/08 ,  C07C211/61

CPC classification number: H01L51/0072 ,  H01L51/504 ,  C07D401/14 ,  C09K11/06 ,  H01L51/0067 ,  C07D235/18 ,  H01L51/0052 ,  H01L51/0058 ,  C07D235/08 ,  C07C211/61 ,  H01L51/006 ,  H01L51/005 ,  H01L51/5072

Abstract: A light emitting device and a light emitting display device that are capable of improving efficiency, driving voltage, and lifespan by varying the configuration of a layer adjacent to a blue light emitting layer in a blue fluorescent stack contacting a cathode are disclosed. The light emitting device includes stacks between an anode and a cathode, wherein an nth stack contacting the cathode is a first blue stack that includes a first hole transport layer, a first electron-blocking layer, a first blue light emitting layer containing a boron-based dopant having an emission peak of 430 nm to 480 nm, a first electron transport layer contacting the first blue light emitting layer, and an electron injection layer having two sides contacting the first electron transport layer and the cathode, respectively, wherein the first electron transport layer contains a mixture of a first material and a second material.