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Simple white organic light emitting diodes with improved color stability and efficiency using phosphorescent and fluorescent emitters

Cited 17 time in Web of Science Cited 26 time in Scopus
Authors
Baek, Heume-Il; Lee, Changhee
Issue Date
2008-06-17
Publisher
American Institute of Physics
Citation
J. Appl. Phys. 103, 124504
Abstract
White organic light emitting diodes WOLEDs with both phosphorescent and fluorescent emitting
layers EML usually adopt an interlayer between them to achieve high efficiency by preventing
mutual quenching, but insertion of the interlayer causes a higher operating voltage as well as
additional fabrication steps. Here, we demonstrate that simple-structure WOLEDs without an
interlayer could be achieved using the combination of phosphor-sensitized-fluorescent red and
phosphorescent blue EMLs. In addition, the main cause of the color shift with increasing current
density was identified, and the color shift of the WOLED was successfully suppressed by properly
balancing emission from the red and blue EMLs. Consequently, a maximum external quantum
efficiency of 6.2% a current efficiency of 14.3 cd/A and very stable color coordinates of
0.32 0.01, 0.42 0.002 were achieved. However, the elimination of an interlayer for the
combination with a fluorescent blue EML causes about 50% decrease in the efficiency and a large
change in the color coordinates with the driving current density. © 2008 American Institute of
Physics.
ISSN
0021-8979
Language
English
URI
http://hdl.handle.net/10371/13758
DOI
https://doi.org/10.1063/1.2939573
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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