Ultrafast Energy Transfer between Disordered and Highly Planarized Chains of Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV).
Ultrafast Energy Transfer between Disordered and Highly Planarized Chains of Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV).
复制标题
DOI：
10.1021/acsmacrolett.5b00133
复制
发表时间：
2015-03
影响因子：
5.8
通讯作者：
T. Unger;Fabian Panzer;C. Consani;Federico Koch;T. Brixner;H. Bässler;A. Köhler
中科院分区：
文献类型：
--
作者：
T. Unger;Fabian Panzer;C. Consani;Federico Koch;T. Brixner;H. Bässler;A. Köhler
在冷却聚[2-甲氧基-5-（2-乙基己氧基）-1，4-亚苯基亚乙烯基]（MEH-PPV）的溶液时，发生相变，导致聚集体的形成。我们已经研究了单重态激子在MEH-PPV溶液中的相变的临界温度以下的动态使用稳态光致发光测量和泵浦-探测fs-光谱在不同的温度。光谱分析表明，无序的发色团与高度平面化的发色团共存。高平面性由光谱中显著高的0-0/0-1峰比证明。通过光谱分离的任一类型的发色团的泵浦探测信号的贡献，我们发现，能量转移发生在小于1 ps的无序，未聚集的链段高度平坦化，聚集的链段。能量转移的短时间尺度表明平面化和无序的聚合物发色团的紧密混合。
Upon cooling a solution of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), a phase transition occurs, leading to the formation of aggregates. We have studied the dynamics of singlet excitons in MEH-PPV solution below the critical temperature of the phase transition using steady-state photoluminescence measurements and pump-probe fs-spectroscopy at different temperatures. Spectral analysis indicates the coexistence of disordered chromophores with highly planarized chromophores. The high planarity is evidenced by a remarkably high 0-0/0-1 peak ratio in the spectra. By spectrally separating the contributions of either type of chromophore to the pump-probe signal we find that energy transfer takes place within less than 1 ps from disordered, unaggregated chain segments to highly planarized, aggregated chain segments. The short time scale of the energy transfer indicates intimate intermixing of the planarized and disordered polymeric chromophores.