Document Type
Journal Article
Department/Unit
Department of Physics
Title
Study of sequential dexter energy transfer in high efficient phosphorescent white organic light-emitting diodes with single emissive layer
Language
English
Abstract
In this study, we report our effort to realize high performance single emissive layer three color white phosphorescent organic light emitting diodes (PHOLEDs) through sequential Dexter energy transfer of blue, green and red dopants. The PHOLEDs had a structure of; ITO(1500Å)/NPB(700Å)/ mCP:Firpic-x%:Ir(ppy)3-0.5%:Ir(piq)3-y%(300Å)/TPBi(300Å)/Liq(20Å)/Al(1200Å). The dopant concentrations of FIrpic, Ir(ppy)3 and Ir(piq)3 were adjusted and optimized to facilitate the preferred energy transfer processes attaining both the best luminous efficiency and CIE color coordinates. The presence of a deep trapping center for charge carriers in the emissive layer was confirmed by the observed red shift in electroluminescent spectra. White PHOLEDs, with phosphorescent dopant concentrations of FIrpic-8.0%:Ir(ppy)3-0.5%:Ir(piq)3-0.5% in the mCP host of the single emissive layer, had a maximum luminescence of 37,810 cd/m2 at 11 V and a luminous efficiency of 48.10 cd/A at 5 V with CIE color coordinates of (0.35, 0.41).
Publication Date
2014
Source Publication Title
Scientific Reports
Volume
4
Start Page
7009
Publisher
Nature Publishing Group
DOI
10.1038/srep07009
Link to Publisher's Edition
ISSN (print)
20452322
ISSN (electronic)
20452322
Recommended Citation
Kim, Jin Wook, Seung Il You, Nam Ho Kim, Ju-An Yoon, Kok Wai Cheah, Fu Rong Zhu, and Woo Young Kim. "Study of sequential dexter energy transfer in high efficient phosphorescent white organic light-emitting diodes with single emissive layer." Scientific Reports 4 (2014): 7009.