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Highly efficient polymer blends from a polyfluorene derivative and PVK for LEDs

✍ Scribed by Bruno Nowacki; Eduardo Iamazaki; Ali Cirpan; Frank Karasz; Teresa D.Z. Atvars; Leni Akcelrud

Book ID
104088049
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
859 KB
Volume
50
Category
Article
ISSN
0032-3861

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✦ Synopsis

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.

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