Efficient carrier and exciton confinement in white phosphorescent organic light-emitting diodes
- Authors
- Lee, Seok Jae; Koo, Ja Ryong; Shin, Hyun Su; Kim, Young Kwan; Lee, Kum Hee; Yoon, Seung Soo
- Issue Date
- Nov-2012
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- White phosphorescent organic light-emitting diodes; Triplet exciton confinement; Triplet exciton blocking layer; TCTA buffer layer
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.61, no.10, pp.1619 - 1622
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 61
- Number
- 10
- Start Page
- 1619
- End Page
- 1622
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/18869
- DOI
- 10.3938/jkps.61.1619
- ISSN
- 0374-4884
- Abstract
- We demonstrated that the luminous and the external quantum efficiencies of white phosphorescent organic light-emitting diodes (PHOLEDs) were improved by using a device architecture that confines the carriers and the excitons inside an emitting layer (EML). Two white PHOLEDs were fabricated with a commercially available red-phosphorescence emitter bis(2-phenylquinolinato)-acetylacetonate iridium III (Ir(pq)(2)acac) doped in N,N'-dicarbazolyl-3,5-benzene (mCP), and a blue-phosphorescence emitter bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) doped in p-bis(triphenylsilyly)benzene (UGH2), as red/blue emitting layers. In addition, both devices (devices A and B) had a triplet exciton blocking layer (TEBL) on the hole-transportinglayer (HTL) side, and a high triplet state material was used to get a high efficiency. Device B had one more buffer layer of p-type 4,4',4aEuro(3)-tri(N-carbazolyl) triphenylamine (TCTA) material between the HTL and the TEBL. The properties of device B, which exhibited a maximum luminous efficiency and a maximum external quantum efficiency of 22.77 cd/A and 11.5%, respectively, was found to be superior to the device A and showed white emission with CIE (X,Y) coordinates of (x = 0.33, y = 0.37) at 8 V.
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