公开(公告)号：US20180301662A1

公开(公告)日：2018-10-18

申请号：US15762245

申请日：2016-08-11

Applicant: Cambridge Display Technology Limited

Inventor： Philip Benzie ,  Colin Baker ,  Adam Strevens ,  William Young

IPC: H01L51/52 ,  H01L51/50

CPC classification number: H01L51/5265 ,  H01L51/504 ,  H01L51/5218 ,  H01L51/5234 ,  H01L2251/5315

Abstract: An organic light emitting device which emits white light in use, comprising a reflective anode (3), a first light emitting layer (9) which emits red light located over said anode, a second light emitting layer (11) which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-reflecting layer (15) and a second semi-reflecting layer (21) with a layer (19) of light transmissive material between the first and second semi-reflecting semi-transparent layers, the distance between the reflective anode (3) and the first semi-reflecting semi-transparent layer (17) being selected to form a micro-cavity which enhances blue light emission and red light emission from the device, and the distance between the reflective anode (3) and the second semi-reflecting semi-transparent layer (21) being selected to enhance green light emission from the device.

公开(公告)号：US10770686B2

公开(公告)日：2020-09-08

申请号：US15762245

申请日：2016-08-11

Applicant: Cambridge Display Technology Limited

Inventor： Philip Benzie ,  Colin Baker ,  Adam Strevens ,  William Young

IPC: H01L51/52 ,  H01L51/50

Abstract: An organic light emitting device which emits white light in use, comprising a reflective anode (3), a first light emitting layer (9) which emits red light located over said anode, a second light emitting layer (11) which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-reflecting layer (15) and a second semi-reflecting layer (21) with a layer (19) of light transmissive material between the first and second semi-reflecting semi-transparent layers, the distance between the reflective anode (3) and the first semi-reflecting semi-transparent layer (17) being selected to form a micro-cavity which enhances blue light emission and red light emission from the device, and the distance between the reflective anode (3) and the second semi-reflecting semi-transparent layer (21) being selected to enhance green light emission from the device.