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Stable efficiency roll-off in phosphorescent organic light-emitting diodes

Cited 91 time in Web of Science Cited 110 time in Scopus
Authors
Kim, Sung Hyun; Jang, Jyongsik; Yook, Kyoung Soo; Lee, Jun Yeob
Issue Date
2008-01-18
Publisher
American Institute of Physics
Citation
Appl. Phys. Lett. 92, 023513
Abstract
Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency
roll-off was significant in the device with narrow recombination zone RZ and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage.
Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of 20 000 cd/m2.
ISSN
0003-6951
Language
English
URI
http://hdl.handle.net/10371/48998
DOI
https://doi.org/10.1063/1.2836270
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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