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Improved blue light-emitting polymeric device by the tuning of drift mobility and charge balance

Cited 19 time in Web of Science Cited 31 time in Scopus
Authors
Chin, Byung Doo; Suh, Min Chul; Lee, Seong Taek; Chung, Ho Kyoon; Lee, Changhee
Issue Date
2004-03-08
Publisher
American Institute of Physics
Citation
Appl. Phys. Lett. 84, 1777
Abstract
We have prepared blue polymer-small molecule hybrid electroluminescence devices with improved
efficiency and lower driving voltage by the statistical design method. Analysis of time-of-flight
measurement shows that amorphous small molecule hole-transporter blended with a blue
light-emitting polymer increases the field-dependent hole mobility, with transition from
nondispersive to dispersive transport induced by the charge-trapping effect. Moreover, at the
electroluminescent devices with different electron injection/transport layer ~LiF/Al, LiF/Ca/Al, and
Alq3 /LiF/Al), efficiency was further increased. We have analyzed that carrier mobility of a
multilayered device can also be controlled by the change of electron injection and transport layers.
We find that structural design and matching overall charge balance is an essential factor to improve
both the operating voltage and efficiency of existing blue polymer devices.
ISSN
0733-8724
Language
English
URI
https://hdl.handle.net/10371/13817
DOI
https://doi.org/10.1109/JLT.2006.874591
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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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