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Type: Artigo de periódico
Title: Highly efficient polymer blends from a polyfluorene derivative and PVK for LEDs
Author: Nowacki, B
Iamazaki, E
Cirpan, A
Karasz, F
Atvars, TDZ
Akcelrud, L
Abstract: The photophysical and electroluminescent properties of blends of a polyfluorene derivative of the PPV type, poly[(9,9-dihexyl-9H-fluorene-2,7-diyl)-1,2-ethenediyl-1,4-phenylene-1,2-ethenediyl] (labeled as LaPPS16) and poly(vinylcarbazole) - PVK are presented and discussed in terms of the operating light emission mechanisms. Static and dynamic fluorescence measurements and morphology data showed a powerful exciton migration from the host (PVK) to the guest (LaPPS16) resulting in emission coming from solely LaPPS16, even when in concentrations small as 1%. Electroluminescence was greatly enhanced with the blending; increases of 18 times in efficiency and 20 times in luminance were achieved in the blend containing 20% LaPPS16, with 3 V applied voltage. (C) 2009 Elsevier Ltd. All rights reserved.
Subject: Photoluminescence
Polymer blends
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Polymer. Elsevier Sci Ltd, v. 50, n. 25, n. 6057, n. 6064, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.polymer.2009.09.056
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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