Selmarten Donald, Jones Marcus, Rumbles Garry, Yu Pingrong, Nedeljkovic Jovan, Shaheen Sean
Center for Basic Science, National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
J Phys Chem B. 2005 Aug 25;109(33):15927-32. doi: 10.1021/jp0515479.
In this communication we discuss the possibility of hole transfer between a photoexcited semiconductor quantum dot and a pi-conjugated polymer. This charge-transfer event will be investigated (exploited) on the basis of its implication toward a solar energy conversion scheme. Experimentally, we show that the steady-state photoluminescence (PL) of a solution of InP quantum dots is quenched by the introduction of solvated poly(3-hexylthiophene). Time-resolved PL experiments on these solutions are also presented. It was observed that the PL transients did not significantly change upon the addition of the conductive polymer. These new results indicate that said PL quenching is static in nature. This suggests that in solution, the quantum dot and the polymer exhibit a strong intermolecular interaction. As the two species encounter each other through diffusion, the polymer quenches the quantum dot photoluminescence without altering the population's PL lifetime. This new evidence suggests that the polymer and the quantum dot form a relatively stable complex.
在本通讯中，我们讨论了光激发半导体量子点与π共轭聚合物之间空穴转移的可能性。将基于其对太阳能转换方案的影响来研究（利用）这一电荷转移事件。实验表明，通过引入溶剂化的聚（3-己基噻吩），InP量子点溶液的稳态光致发光（PL）被猝灭。还展示了对这些溶液进行的时间分辨PL实验。观察到加入导电聚合物后PL瞬态没有显著变化。这些新结果表明所述PL猝灭本质上是静态的。这表明在溶液中，量子点和聚合物表现出强烈的分子间相互作用。当这两种物质通过扩散相互接触时，聚合物猝灭量子点的光致发光，而不改变粒子群的PL寿命。这一新证据表明聚合物和量子点形成了相对稳定的复合物。
