Efficient excitation transfer from polymer to nanocrystals

Tung-Wah Frederick Chang; Musikhin, Sergei; Bakueva, Ludmila; Levina, Larissa; Hines, Margaret A.; Cyr, Paul W.; Sargent, Edward H.
May 2004
Applied Physics Letters;5/24/2004, Vol. 84 Issue 21, p4295
Academic Journal
We quantify experimentally the efficiency of excitation transfer from a semiconducting polymer matrix to quantum dot nanocrystals. We study 5±0.5 nm PbS nanocrystals embedded in MEH-PPV (poly[2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)]) polymer. We determine the excitation transfer efficiency from normalized photoluminescence excitation measurements. When the composites are made using as-synthesized PbS nanocrystals capped by oleate ligands, the excitation transfer efficiency is about 20%. Replacing these ligands with shorter chains results in a factor-of-3 enhancement in the excitation transfer efficiency. Our findings provide guidance to the realization of efficient electroluminescent devices. © 2004 American Institute of Physics.


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