Study on carrier transport of thick OLEDs

Yu-Hung Cheng; Yang-Che Hung; Ming-Chang Lee; Kao-Chih Syao; Chien-Hong Cheng

doi:10.1117/12.662352

20 April 2006 Study on carrier transport of thick OLEDs

Yu-Hung Cheng, Yang-Che Hung, Ming-Chang Lee, Kao-Chih Syao, Chien-Hong Cheng

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 61921Q (2006) https://doi.org/10.1117/12.662352
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

Yu-Hung Cheng, Yang-Che Hung, Ming-Chang Lee, Kao-Chih Syao, and Chien-Hong Cheng "Study on carrier transport of thick OLEDs", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61921Q (20 April 2006); https://doi.org/10.1117/12.662352

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