公开(公告)号：US20210210711A1

公开(公告)日：2021-07-08

申请号：US17033772

申请日：2020-09-26

Applicant: Samsung Display Co., Ltd.

Inventor： Dongchan KIM ,  Jiyoung MOON ,  Heechang YOON ,  Jihye LEE ,  Hakchoong LEE ,  Haemyeong LEE ,  Yoonhyeung CHO ,  Myungsuk HAN ,  Jihwan YOON ,  Jonghyuk LEE

IPC: H01L51/50 ,  H01L27/32 ,  H01L51/56

Abstract: A light-emitting device includes a first electrode; a second electrode facing the first electrode; m emission units between the first electrode and the second electrode; and m−1 charge-generating unit(s) between adjacent ones of the emission units, where m is a natural number of 2 or more. The emission units each include an emission layer. At least one of the charge-generating unit(s) includes an n-type charge-generating layer and a p-type charge-generating layer; and the n-type charge-generating layer includes a first material and a second material. The first material includes an organic electron transport compound; and the second material includes at least one selected from an alkali metal, an alkali metal alloy, an alkaline earth metal, an alkaline earth metal alloy, a lanthanide metal, and a lanthanide metal alloy. The light-emitting device may have improved hole and electron balance, a decreased driving voltage, and excellent efficiency and/or lifespan characteristics.