Simultaneous enhancement of charge transport and exciton diffusion in poly(p-phenylene vinylene) derivatives
Simultaneous enhancement of charge transport and exciton diffusion in poly(p-phenylene vinylene) derivatives
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DOI：
10.1103/physrevb.72.045217
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发表时间：
2005-07
影响因子：
3.7
通讯作者：
D. Markov;C. Tănase;P. Blom;J. Wildeman
中科院分区：
文献类型：
--
作者：
D. Markov;C. Tănase;P. Blom;J. Wildeman
利用时间分辨发光光谱研究了聚对苯乙炔（PPV）衍生物薄膜中激子的扩散行为。由于化学修饰的PPV衍生物不同的三个数量级的电荷载流子迁移率作为一个减少的能量障碍的结果。从PPV/富勒烯异质结构的光致发光衰减曲线，激子扩散系数被发现增加了一个数量级，减少无序。这种扩散系数的增加通过激子寿命的减少来补偿，导致各种PPV衍生物的激子扩散长度为5-6 nm。
Time-resolved luminescence spectroscopy has been used to investigate exciton diffusion in thin films of poly(p-phenylene vinylene) (PPV)-based derivatives. Due to chemical modifications the PPV derivatives differ by three orders of magnitude in charge carrier mobility as a result of a reduced energetic disorder. From the photoluminescence decay curves of PPV/fullerene heterostructures, the exciton diffusion coefficient was found to increase by one order of magnitude with decreasing disorder. This increase in the diffusion coefficient is compensated by a decrease of the exciton lifetime, leading to an exciton diffusion length of 5-6 nm for the various PPV derivatives.