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Proceedings Paper

Study on carrier transport of thick OLEDs
Author(s): Yu-Hung Cheng; Yang-Che Hung; Ming-Chang Lee; Kao-Chih Syao; Chien-Hong Cheng
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Paper Abstract

The optical and electronic characteristics of thick OLEDs were examined by varying the thickness of the carrier transport layers (NPB and Alq3) for the first time. For having better mode guiding, more than 285nm thickness device was studied in this paper. The experimental results show the threshold voltage is proportional to the total thickness but the breakdown electric fields decrease. I-V curves can be fitted with a second-order polynomial form, and these fit-ting curves can be used for modeling the carrier transport in thick OLEDs. Eventually, a comprehensive model is pro-posed to describe the carrier transport due to the trap effect in bulk organic materials. It shows this model is in a good agreement with our measured I-V curves.

Paper Details

Date Published: 20 April 2006
PDF: 8 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61921Q (20 April 2006); doi: 10.1117/12.662352
Show Author Affiliations
Yu-Hung Cheng, National Tsing Hua Univ. (Taiwan)
Yang-Che Hung, National Tsing Hua Univ. (Taiwan)
Ming-Chang Lee, National Tsing Hua Univ. (Taiwan)
Kao-Chih Syao, National Tsing Hua Univ. (Taiwan)
Chien-Hong Cheng, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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