公开(公告)号：US20170117480A1

公开(公告)日：2017-04-27

申请号：US15147374

申请日：2016-05-05

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Eonseok OH ,  Sangyeol KIM ,  Jungyeon KIM ,  Minkyoung JO ,  Bomi CHOI

IPC: H01L51/00

CPC classification number: H01L51/0058 ,  H01L51/0067 ,  H01L51/0081 ,  H01L51/5004 ,  H01L51/5028 ,  H01L51/5056 ,  H01L51/5076 ,  H01L51/508 ,  H01L51/5088 ,  H01L51/5092 ,  H01L51/5206 ,  H01L51/5221 ,  H01L2251/552 ,  H01L2251/558

Abstract: An organic electroluminescent device includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region. The electron transport region includes a first electron transport layer on the emission layer; and a second electron transport layer on the first electron transport layer. An absolute value of difference between a highest occupied molecular orbital (HOMO) energy level of the emission layer and a HOMO energy level of the first electron transport layer is about 0.3 eV to about 1.5 eV.