Efficient triplet exciton confinement of white organic light-emitting diodes using a heavily doped phosphorescent blue emitter
- Authors
- Lee, Seok Jae; Seo, Ji Hoon; Kim, Jun Ho; Kim, Hoe Min; Lee, Kum Hee; Yoon, Seung Soo; Kim, Young Kwan
- Issue Date
- 1-Sep-2010
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- White phosphorescent organic light-emitting diodes; Heavily doped phosphorescent emitter; Triplet exciton confinement
- Citation
- THIN SOLID FILMS, v.518, no.22, pp.6184 - 6187
- Journal Title
- THIN SOLID FILMS
- Volume
- 518
- Number
- 22
- Start Page
- 6184
- End Page
- 6187
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/20720
- DOI
- 10.1016/j.tsf.2010.04.049
- ISSN
- 0040-6090
- Abstract
- We demonstrated efficient white electrophosphorescence with a heavily doped phosphorescent blue emitter and a triplet exciton blocking layer (TEBL) inserted between the hole transporting layer (HTL) and the emitting layer (EML). We fabricated white organic light-emitting diodes (WOLEDs) (devices A, B, C, and D) using a phosphorescent red emitter; bis(2-phenylquinolinato)-acetylacetonate iridium III (Ir(pq)(2)acac) doped in the host material; N,N'-dicarbazolyl-3,5-benzene (mCP) as the red EML and the phosphorescent blue emitter; bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) doped in the host material; p-bis(triphenylsilyly)benzene (UGH2) as the blue EML The properties of device 8, which demonstrate a maximum luminous efficiency and external quantum efficiency of 26.83 cd/A and 14.0%, respectively, were found to be superior to the other WOLED devices. It also showed white emission with CIExy coordinates of (x = 0.35, y = 0.35) at 8 V. Device D, which has a layer of P-type 4,4',4 ''-tri(N-carbazolyl) triphenylamine (TCTA) material between the HTL and TEBL, was compared with device A to determine the 430 nm emission peak. (C) 2010 Elsevier B.V. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Science > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.