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Proceedings Paper

Methods for balanced charge carriers and enhanced efficiency of organic phosphorescent devices
Author(s): Byung Doo Chin; Nam Su Kang; Heume-Il Baek; Changhee Lee
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Paper Abstract

In this paper, the light emitting efficiency, spectrum, and the lifetime of the phosphorescent devices, whose emission characteristics are strongly dominated not only by the energy transfer but also by the charge carrier trapping induced by the emissive dopant, are explained by differences in the energy levels of the host, dopant, and nearby transport layers. On the basis of our finding on device performance and photocurrent measurement data by time-of-flight (TOF), we suggest a detailed emission mechanism, along with a physical interpretation and practical design scheme for improving the efficiency and lifetime of devices. Moreover, the effects of the modification of charge (both hole and electrons) transporting layers which results in a drop of operating voltage and improved efficiency on the performance of electrophosphorescent device are investigated experimentally. Using the Ir-based phosphorescent emitter, vacuumevaporated, solution-processed, and composition of their hybrid structures are designed for better charge carrier balance and efficient exciton blocking behavior.

Paper Details

Date Published: 14 January 2008
PDF: 8 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280G (14 January 2008); doi: 10.1117/12.767647
Show Author Affiliations
Byung Doo Chin, Korea Institute of Science and Technology (South Korea)
Nam Su Kang, Korea Institute of Science and Technology (South Korea)
Heume-Il Baek, Seoul National Univ. (South Korea)
Changhee Lee, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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