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Journal Article Investigation of Double Emissive Layer Structures on Phosphorescent Blue Organic Light-Emitting Diodes
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Authors
Jong Hee Lee, Jeong Ik Lee, Hye Yong Chu
Issue Date
2009-07
Citation
Synthetic Metals, v.159, no.14, pp.1460-1463
ISSN
0379-6779
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.synthmet.2009.03.026
Abstract
The performances of blue phosphorescent organic light-emitting diodes (PHOLEDs) at high current densities have been investigated with double emissive layer structures (D-EMLs). The D-EMLs are comprised of two emissive layers with a hole-transport-type host of N,N??-dicarbazolyl-3,5-benzene (mCP) and an electro transport-type ultrawide band-gap host of m-bis-(triphenylsilyl)benzene (UGH3) both doped with a blue electro-phosphorescent dopant of iridium(III)bis(4,6-difluorophenyl-pyridinato-N,C2??) picolinate (FIrpic). The expansion of hole/electron recombination zone in D-EMLs has been successfully achieved by controlling of each EML properties, therefore external quantum efficiency, especially at high current density region was significantly enhanced. Moreover, the blue PHOLED with D-EMLs showed substantially reduced roll-off with the external quantum efficiency of 10.0% at 5000 cd/m2. © 2009 Elsevier B.V. All rights reserved.
KSP Keywords
External Quantum Efficiency, High Current Density, Hole transport, Layer structure, Recombination zone, Ultra wide band(UWB), band gap, blue PHOLEDs, blue phosphorescent organic light-emitting diodes, electron recombination, emissive layer(EL)