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Proceedings Paper

Electric field-induced quenching of photoluminescence from Ir(PPY)3 doped PVK
Author(s): Yan Bing Hou; Yun Bai Li; Feng Teng; Xu Rong Xu
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Paper Abstract

In this paper, the photoluminescence(PL) from thin films of factris(2-phenylpyridine) iridium (Ir(ppy)3) doped poly(N-vinylcarbazol) (PVK) modulated by forward bias and reverse bias was measured for the sake of studying the generation and evolution of triplet exciton. The results show that the electric field induced quenching of PL happens before the intersystem crossing from PVK to Ir(PPY)3. Once the triplet excitons at Ir(PPY)3 are formed by the energy transfer from PVK to Ir(PPY)3, it is difficult to dissociate the excitons at Ir(PPY)3. The triplet excitons locating at Ir(PPY)3 molecules is very stable. The electroluminescence mechanism of Ir(PPY)3 doped PVK is also investigated by . For different forward biases, no obvious difference in the profiles of PL spectra is observed, which excludes the influence of electric field and injected carriers on the intersystem crossing from PVK to Ir(PPY)3. Comparing EL spectra and the electric field modulated PL spectra of Ir(PPY)3 doped PVK, we can more reasonably deduce that the main EL emission from Ir(PPY)3 does not come from the energy transfer between PVK chains and Ir(PPY)3 molecules which obeys Föster rule, but comes from the direct recombination of injected carriers at Ir(PPY)3 molecules which act as both the carrier-trap and recombination centers.

Paper Details

Date Published: 12 January 2005
PDF: 8 pages
Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.588295
Show Author Affiliations
Yan Bing Hou, Beijing Jiaotong Univ. (China)
Yun Bai Li, Beijing Jiaotong Univ. (China)
Feng Teng, Beijing Jiaotong Univ. (China)
Xu Rong Xu, Beijing Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 5632:
Light-Emitting Diode Materials and Devices
Gang Yu; Chuangtian Chen; Changhee Lee, Editor(s)

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