Spectroscopy of conjugated polymers: phosphorescence and delayed fluorescence
Spectroscopy of conjugated polymers: phosphorescence and delayed fluorescence
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共轭聚合物的光谱：磷光和延迟荧光
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Bässler
中科院分区：
文献类型：
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作者：
D. Hertel;Y. Romanovskii;B. Schweitzer;U. Scherf;H. Bässler
我们报告的延迟荧光（DF）和磷光（P）的观察从薄膜和稀释冷冻溶液的各种共轭聚合物的PPP型。这些材料在沿聚合物主链的沿着旋转自由度方面不同。在80 K下，当脉冲光激发到材料的S1 ←S 0跃迁时，固体薄膜中出现了μs到ms的延迟发射。在稀释的冷冻溶液中的磷光以一秒量级的辐射寿命单指数衰减。数据分析表明，DF是由成对电子空穴对的复合而不是三重态-三重态湮灭引起的。DF对外加电场的响应的调查支持这一结论。
We report on the observation of delayed fluorescence (DF) and phosphorescence (P) from films and dilute frozen solutions of various conjugated polymers of the PPP-type. The materials differ with respect to the rotational freedom along the polymer backbone. Upon pulsed optical excitation into the S 1 ←S 0 transition of the materials, delayed emission occurs on a time scale of μs to ms in solid films at 80 K. The phosphorescence in dilute frozen solution decays monoexponentially with a radiative lifetime on the order of one second. The data analysis reveals that the DF is caused by recombination of geminate electron hole pairs rather than triplet-triplet annihilation. This conclusion is supported by investigations of the response of the DF to an applied electric field.