Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer.
Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer.
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DOI：
10.1021/jp206368g
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发表时间：
2011-09
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影响因子：
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通讯作者：
G. Khalil;A. Adawi;B. Robinson;A. Cadby;W. C. Tsoi;J.-S. Kim;A. Charas;J. Morgado;David G Lidzey
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文献类型：
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作者：
G. Khalil;A. Adawi;B. Robinson;A. Cadby;W. C. Tsoi;J.-S. Kim;A. Charas;J. Morgado;David G Lidzey
我们研究了基于噻吩的低聚物聚[2,7-(9,9-双(2'-乙基己基)芴)-alt-2,5-三噻吩](PF3T)在溶液中以及以低浓度分散到聚降冰片烯基质中时的情况。我们发现，在溶液中高浓度时，荧光中观察到的 0-0 电子跃迁受到抑制，这一结果表明弱耦合 H 聚集体的形成。在聚合物基质中的低浓度下，可以观察到单分子和分子聚集体的发射。我们发现大多数PF3T发射体的荧光光谱由许多相对较窄的发射特征组成，表明发射通常发生在多个发色团上。然而，少数 PF3T 分子的特点是单一发色团发射、光谱闪烁和发射峰变窄。
We study the thiophene-based oligomer poly[2,7-(9,9-bis(2'-ethylhexyl)fluorene)-alt-2,5-terthiophene] (PF3T) in solution and when dispersed at low concentration into a polynorbornene matrix. We find that at high concentration in solution the 0-0 electronic transition observed in fluorescence is suppressed, a result indicative of the formation of weakly coupled H-aggregates. At low concentration in a polymer matrix, emission from both single molecules and molecular aggregates is observed. We find that the fluorescence spectra of most PF3T emitters are composed of a number of relatively narrow emission features, indicating that the emission usually occurs from multiple chromophores. A small number of PF3T molecules are however characterized by single chromophore emission, spectral blinking, and narrowed emission peaks.