Delayed fluorescence of a poly (p-phenylenevinylene) derivative: Triplet–triplet annihilation versus geminate pair recombination
Delayed fluorescence of a poly (p-phenylenevinylene) derivative: Triplet–triplet annihilation versus geminate pair recombination
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聚（对亚苯基亚乙烯基）衍生物的延迟荧光：三重态-三重态湮灭与双对重组
DOI：
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发表时间：
2002
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：
A. Gerhard;H. Bässler
解决了苯基取代的聚（对亚苯基亚乙烯基）型共聚物（Ph-PPV）延迟荧光的起源问题。必须考虑两个起源，即三重态-三重态湮灭和成对电子-空穴对的重组。 Ph-PPV 以两种不同样品的形式进行研究，即在 80 K 下在 2-甲基四氢呋喃 (MTHF) 玻璃中稀释并作为光密度为 0.6 的薄膜。结果表明，在稀释溶液中，延迟荧光是由于三重态-三重态湮灭而引起的，在薄膜中，延迟荧光是由于双对重组引起的。通过施加2×106 V/cm电场下的延迟荧光实验，可以将延迟荧光归因于薄膜中的双对重组。延迟荧光受到电场的强烈影响，这表明带电物质（即成对的电子空穴对）参与了延迟荧光过程。
The question of the origin of delayed fluorescence from a phenyl-substituted poly(p-phenylenevinylene)-type copolymer (Ph-PPV) is addressed. Two origins have to be considered, i.e., triplet–triplet annihilation and recombination of geminate electron–hole pairs. Ph-PPV is investigated in the form of two different samples, namely diluted in 2-methyltetrahydrofuran (MTHF) glass at 80 K and as a thin film of optical density of 0.6. It will be shown that in the diluted solution, delayed fluorescence is due to triplet–triplet annihilation and in the thin film, it is due to geminate pair recombination. The assignment of delayed fluorescence to geminate pair recombination in the thin film could be made due to delayed fluorescence experiments under applying an electric field of 2×106 V/cm. The delayed fluorescence is strongly influenced by the electric field which is a sign that charged species, i.e., geminate electron–hole pairs, are involved in the process of delayed fluorescence.