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Journal Article Effects of Charge Balance on Device Performances in Deep Blue Phosphorescent Organic Light-Emitting Diodes
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Authors
Jonghee Lee, Jeong-Ik Lee, Joo-Won Lee, Hye Yong Chu
Issue Date
2010-07
Citation
Organic Electronics, v.11, no.7, pp.1159-1164
ISSN
1566-1199
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.orgel.2010.04.014
Project Code
09MB7400, Development of OLED technology for surface lighting, Chu Hye Yong
Abstract
The performances of deep blue phosphorescent organic light-emitting diodes (PHOLEDs) have been investigated by changing the combination and the composition of host materials in a mixed host emissive layer (EML). An electron transport-type host material of m-bis- (triphenylsilyl)benzene (UGH3), was combined with an hole transport-type host materials, N,N??-dicarbazolyl-3, 5-benzene (mCP) or 4,4??,4?꿎??-tris(N-carbazolyl)triphenylamine (TcTa) both doped with a deep blue electro-phosphorescent dopant of iridium(III)bis(40,60-difluorophenylpyridinato) tetrakis(1-pyrazolyl)borate (FIr6). We found that a mixed host structure was effective to control the charge carrier injection and transport in EML. Therefore, we obtained highly improved efficiency in deep blue PHOLEDs with peak external quantum and luminance efficiencies of 22.9% and 39.2 lm/W with maintaining Commission Internationale de L'Eclairage (CIE) coordinates of (x = 0.163, y = 0.287). © 2010 Elsevier B.V. All rights reserved.
KSP Keywords
Carrier injection and transport, Charge carrier injection, Deep blue phosphorescent organic light-emitting diodes, Electron Transport, Hole transport, Improved efficiency, Organic light-emitting diodes(OLEDS), blue PHOLEDs, charge balance, emissive layer(EL), host material