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Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

Cited 162 time in Web of Science Cited 183 time in Scopus
Authors
Kang, Jae-Wook; Lee, Se-Hyung; Park, Hyung-Dol; Jeong, Won-Ik; Yoo, Kyung-Mo; Park, Young-Seo; Kim, Jang-Joo
Issue Date
2007-05-31
Publisher
American Institute of Physics
Citation
Appl. Phys. Lett. 90, 223508 (2007)
Abstract
The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. Low roll-off of efficiency in a PhOLED was achieved using dual emitting layers (D-EMLs) by confining the exciton formation near the interface between the emitting layers. The external quantum efficiency was maintained almost constant up to 22 mA/cm2 (10 000 cd/m2) by adopting the D-EMLs in Ir(ppy)3 based PhOLEDs, resulting in high external quantum efficiency (ext=13.1%) at high luminance.
ISSN
0003-6951 (print)
1077-3118 (online)
Language
English
URI
http://hdl.handle.net/10371/7020
DOI
https://doi.org/10.1063/1.2745224
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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