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Electroluminescence properties of organic light-emitting diodes with a red dye doped into Alq3:rubrene mixed Host

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Authors
Kang, Hee-Young; Lee, Changhee
Issue Date
2004
Publisher
한국물리학회 = The Korean Physical Society
Citation
J. Korean Phys. Soc. 45, 756
Keywords
Organic light emitting diodesRed fluorescent dyeDoping
Abstract
We have studied the electroluminescence (EL) properties of devices with a red fluorescent dye, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB), doped into a mixed matrix of tris-(8-hydroxyquinoline)aluminum (Alq$_3$) and rubrene. The devices doped with DCJTB in the Alq$_3$:rubrene mixed host show an efficient red emission from DCJTB with negligible EL emission from both Alq$_3$ and rubrene. The QE increases with increasing rubrene concentration and reaches a maximum of about 3.6 % for a DCJTB doping concentration of about 5 % in the Alq$_3$:rubrene mixed (50:50 % ratio by weight) host, and then decreases at higher rubrene concentration, due to the concentration quenching effect. At a given bias voltage, the current density increases with increasing rubrene doping concentration, but it decreases with increasing DCJTB doping concentration. The results imply that the injected electrons and holes can transport via hopping through the energy levels of rubrene molecules while DCJTB acts as traps.
ISSN
0374-4884 (Print)
1976-8524 (Online)
Language
English
URI
http://hdl.handle.net/10371/13745
DOI
https://doi.org/10.3938/jkps.45.756
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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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