Li Penglei, Di Stasio Francesco, Eda Goki, Fenwick Oliver, McDonnell Shane O, Anderson Harry L, Chhowalla Manish, Cacialli Franco
London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (UK).
Chemphyschem. 2015 Apr 27;16(6):1258-62. doi: 10.1002/cphc.201402744. Epub 2015 Feb 4.
We report the incorporation of graphene-oxide quantum dots (GOQDs) into films, diluted solutions, and light-emitting diodes (LEDs) as part of a water-soluble derivative of poly(p-phenylene vinylene), or PDV.Li, to investigate their impact on the light-emission properties of this model conjugated polymer. Despite the well-known ability of graphene and graphene oxide to quench the photoluminescence of nearby emitters, we find that the addition of GOQDs to diluted solutions of PDV.Li does not significantly affect the photoluminescence (PL) dynamics of PDV.Li, bringing about only a modest quenching of the PL. However, loading the polymer with GOQDs led to a substantial decrease in the turn-on voltage of LEDs based on GOQD-PDV.Li composites. This effect can be attributed to either the improved morphology of the host polymer, resulting in an increase in the charge mobility, or the enhanced injection through GOQDs near the electrodes.
我们报道了将氧化石墨烯量子点（GOQDs）掺入薄膜、稀释溶液和发光二极管（LED）中，作为聚对苯撑乙烯（PDV.Li）的水溶性衍生物的一部分，以研究它们对这种模型共轭聚合物发光特性的影响。尽管石墨烯和氧化石墨烯具有众所周知的淬灭附近发光体光致发光的能力，但我们发现，向PDV.Li的稀释溶液中添加GOQDs并不会显著影响PDV.Li的光致发光（PL）动力学，只会导致PL有适度的淬灭。然而，用GOQDs负载聚合物会导致基于GOQD-PDV.Li复合材料的LED的开启电压大幅降低。这种效应可归因于主体聚合物形态的改善，导致电荷迁移率增加，或者归因于通过靠近电极的GOQDs增强了注入。
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