Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films
Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films
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DOI：
10.1103/physrevb.78.245201
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发表时间：
2008-12-01
影响因子：
3.7
通讯作者：
Samuel, Ifor D. W.
中科院分区：
文献类型：
--
作者：
Shaw, Paul E.;Ruseckas, Arvydas;Samuel, Ifor D. W.
我们报告了一个系统的研究缩放与距离的共轭聚合物薄膜之间的电子能量转移的二氧化硅间隔。能量转移动力学直接从时间分辨光致发光测量获得，并且对于z >= 8 nm，显示激发供体和受体膜之间的转移速率的1/z（3）距离依赖性。这与福斯特理论是一致的，但在较短的分离的能量转移比预测的要慢，可以解释为点偶极子近似在z类似于5 nm的故障。这些结果对于有机光致发光器件和发光器件是相关的，其中能量转移可以提供提高性能的手段。
We report a systematic study of the scaling with distance of electronic energy transfer between thin films of conjugated polymers separated by a silica spacer. The energy-transfer kinetics were obtained directly from time-resolved photoluminescence measurements and show a 1/z(3) distance dependence of the transfer rate between the excited donor and the acceptor film for z >= 8 nm. This is consistent with Forster theory; but at shorter separations the energy transfer is slower than predicted and can be explained by the breakdown of the point-dipole approximation at z similar to 5 nm. The results are relevant for organic photovoltaics and light-emitting devices, where energy transfer can provide a means of increasing performance.