公开(公告)号：US20220209154A1

公开(公告)日：2022-06-30

申请号：US17560601

申请日：2021-12-23

Applicant: LG DISPLAY CO., LTD.

Inventor： Yong Hwan KIM ,  Ki Woog SONG ,  Ji Hoon KIM ,  Ji Yun KIM

IPC: H01L51/50 ,  H01L27/32

Abstract: A white light emitting device and a light emitting display device including the same, in which the relationship between the triplet energy levels of dopants of emission layers is appropriately adjusted so as to improve the efficiency of the white light emitting device and the light emitting display device, thereby increasing a color temperature and enabling rich color representation.

公开(公告)号：US20220209153A1

公开(公告)日：2022-06-30

申请号：US17549323

申请日：2021-12-13

Applicant: LG DISPLAY CO., LTD.

Inventor： Yong Hwan KIM ,  Ki Woog SONG

IPC: H01L51/50 ,  H01L27/32

Abstract: A white light emitting device and the light emitting display device including the same have an improved structure capable of preventing a color difference between regions and eliminating a difference in color characteristics between a low grayscale level and a high grayscale level.

公开(公告)号：US20240260304A1

公开(公告)日：2024-08-01

申请号：US18375715

申请日：2023-10-02

Applicant: LG Display Co., Ltd.

Inventor： Dong Ik LEE ,  Jin Hwan PARK ,  Ji Yun KIM ,  Dong Hyuk KIM ,  Yong Hwan KIM

IPC: H10K50/19 ,  H10K50/13

CPC classification number: H10K50/19 ,  H10K50/131

Abstract: A light emitting device includes a first electrode and a second electrode facing each other on a substrate, and an intermediate layer including a first blue stack, a first charge generation layer, and a phosphorescent stack between the first electrode and the second electrode. The first blue stack includes a hole transport layer, a first blue light-emitting layer, a second blue light-emitting layer, and an electron transport layer in this order. Further, the first blue light-emitting layer includes a first host and a blue dopant, and the second blue light-emitting layer includes a second host and the blue dopant. Also, a triplet energy level of the first host is greater than a triplet energy level of the second host and is smaller than a triplet energy level of the dopant.

公开(公告)号：US20230217670A1

公开(公告)日：2023-07-06

申请号：US18086298

申请日：2022-12-21

Applicant: LG Display Co., Ltd.

Inventor： Jin Hwan PARK ,  Ji Yun KIM ,  Yong Hwan KIM ,  Tae Shick KIM ,  Kwang Hyun KIM ,  Dong Hyuk KIM

IPC: H10K50/13 ,  H10K50/15 ,  H10K50/16 ,  H10K59/12

CPC classification number: H10K50/13 ,  H10K50/15 ,  H10K50/16 ,  H10K59/12

Abstract: Discussed is a light-emitting device including a first light-emitting layer so that a dopant having a hole trapping property is adjacent to a hole transport layer, and a second light-emitting layer that comes into contact with the first light-emitting layer to induce main light emission, thereby widening an emission zone and improving the efficiency and lifespan of the light-emitting layer. Also discussed is a light-emitting display including the light-emitting device. The first and second blue light-emitting layers can include a same host BH and different first and second blue dopants, respectively, and the first blue dopant can have a higher highest occupied molecular orbital (HOMO) energy level than a HOMO energy level of the hole transport layer.