Triplet exciton generation and decay in a red polydiacetylene studied by femtosecond spectroscopy
Triplet exciton generation and decay in a red polydiacetylene studied by femtosecond spectroscopy
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DOI：
10.1016/s0009-2614(99)01104-5
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发表时间：
1999-11-12
影响因子：
2.8
通讯作者：
Dellepiane, G
中科院分区：
文献类型：
--
作者：
Lanzani, G;Stagira, S;Dellepiane, G
飞秒/皮秒瞬态吸收光谱测量结果在近红外/可见光谱区的红色形式的可溶性聚咔唑基二乙炔在聚乙烯矩阵的报告。链内的单重态和三重态激子的光诱导带的不同动力学的确定。结果与位于第一光学允许电子态以下的单重态裂变产生超快（< 200 fs）的三重态对一致。在皮秒的时间域中，三重态对进行随机游走在一个一维的路径与统计分布的陷阱和部分解离成长寿命（全等150亩）本地化的三重态。(C)1999 Elsevier Science B. V.保留所有权利。
Results from femtosecond/picosecond transient absorption spectra measurements in the near-infrared/visible spectral region of the red form of a soluble polycarbazolyldiacetylene in a polyethylene matrix are reported. Intrachain singlet and triplet excitons are identified by the different dynamics of the photoinduced bands. The results are consistent with the ultrafast generation (< 200 fs) of triplet pairs by fission of a singlet state located below the first optically allowed electronic state. In the picosecond time domain, triplet pairs undergo a random walk in a one-dimensional path with statistically distributed traps and partially dissociate into long-lived (congruent to 150 mu s) localized triplets. (C) 1999 Elsevier Science B.V. All rights reserved.