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Proceedings Paper

Studies of blue organic electroluminescent devices using the polymer/dopant systems as a light-emitting layer
Author(s): Fu-Chiao Wu; Horng-Long Cheng; Wei-Yang Chou
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Paper Abstract

In this study, blue organic light-emitting diodes (OLEDs) using polymer-dopant systems as a light-emitting layer were fabricated. The light-emitting layer was produced via a spin-coating process. The materials used in the light-emitting layer included: poly(9-vinylcarbazole) (PVK) as a matrix material, and blue-emission 4,4'-bis(2,2-diphenylvinyl)biphenyl (DPVBi) as a light-emitting material. The blue OLED was fabricated by blending PVK and DPVBi according to the proportion of mass as specified for a light-emitting layer. Process relevant photophysical mechanisms and energy transfer phenomena were studied using absorption, photoluminescence (PL), photoluminescent excitation, and electroluminescence (EL) spectra. We have learned that there was energy transfer phenomenon between PVK and DPVBi. More specifically, the EL spectrum of PVK:DPVBi was significantly different from the PL spectra of PVK, DPVBi, and PVK:DPVBi, shifting to a longer wavelength and showing multiple boarding emission peaks (maximum emission at 465 and 486 nm). The electro-optical characteristics of the blue OLED and the possible origin of the difference between the EL and PL spectra were discussed.

Paper Details

Date Published: 16 October 2007
PDF: 10 pages
Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66551P (16 October 2007); doi: 10.1117/12.733735
Show Author Affiliations
Fu-Chiao Wu, National Cheng Kung Univ. (Taiwan)
Horng-Long Cheng, National Cheng Kung Univ. (Taiwan)
Wei-Yang Chou, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6655:
Organic Light Emitting Materials and Devices XI
Zakya H. Kafafi; Franky So, Editor(s)

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