公开(公告)号：US20230117065A1

公开(公告)日：2023-04-20

申请号：US17834533

申请日：2022-06-07

Applicant: Samsung Display Co., Ltd.

Inventor： NAMSU KANG ,  HUIJU PARK ,  SONGEUN LEE ,  HYUNSHIK LEE

IPC: H01L51/50 ,  C07D209/82 ,  C07D307/91 ,  C07C15/38 ,  C07D241/42 ,  C07C43/235 ,  C07C321/30 ,  C07D413/14 ,  C07C211/54 ,  C07D401/14 ,  C07D471/04 ,  C07D403/10 ,  C07D491/147 ,  C07D519/00 ,  C07D333/76 ,  C07D403/04 ,  C07D231/56 ,  C07F9/53 ,  H01L51/00

Abstract: A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission part disposed between the first electrode and the second electrode and including a first emission layer and a second emission layer disposed on the first emission layer, the first emission layer may include a first host, and a first dopant, and the second emission layer may include a hole transport host different from the first host, an electron transport host, and a second dopant. A first hole mobility of the first host may be in a range of about 5.0×10−6 cm2/Vs to about 1.0×10−3 cm2/Vs, a second hole mobility of a host mixture including the hole transport host and the electron transport host may be in a range of about 1.0×10−6 cm2/Vs to about 1.0×10−4 cm2/Vs, and the first hole mobility may be larger than the second hole mobility.

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.