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Triplet energy transfer in conjugated polymers. III. An experimental assessment regarding the influence of disorder on polaronic transport

机译:共轭聚合物中的三重态能量转移。三,关于无序对极化子运输影响的实验评估

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摘要

It is a general notion that, in organic semiconductors, the transport of electronic excitations, such as neutral excitons of singlet or triplet type and charge carriers, is controlled by both, polaron and disorder effects. For compounds with low energetic disorder triplet exciton diffusion can be described in the framework of Marcus-theory [see Sudha Devi et al.,Phys. Rev. B 78, 045210 (2008)], and a theoretical model for diffusion in more disordered compounds has been developed [see Fishchuk et al, Phys. Rev. B 78, 045211 (2008)]. Here we experimentally demonstrate that such a modified Marcus-type model is suitable to describe triplet exciton transport in commonly used poly(p-phenylene)-type polymers and oligomers. In particular, we provide a quantitative spectroscopic assessment of the polaronic and the disorder contribution to triplet exciton transport as a function of conjugation length. Franck-Condon analyses of the phosphorescence spectra and temperature-dependent triplet diffusion combined with analytic transport theory demonstrate that, in contrast to charge carriers, Marcus-type jump rates with dominantly polaronic activation energies control the motion of triplet excitons above a transition temperature.
机译:通常的观念是,在有机半导体中,电子激发的传输,例如单重态或三重态类型的中性激子和电荷载流子,都受极化子效应和无序效应的控制。对于低能紊乱的化合物,三重态激子扩散可以在马库斯理论的框架中进行描述[参见Sudha Devi等,Phys。 Rev.B 78,045210(2008)],并且已经开发了在更多的无序化合物中扩散的理论模型[参见Fishchuk等,Phys.Immun。修订版B 78,045211(2008)。在这里,我们通过实验证明了这种修改后的Marcus型模型适合于描述常用的聚(对亚苯基)型聚合物和低聚物中的三重态激子传输。尤其是,我们提供了极化光谱和无序对三重态激子传输的贡献作为共轭长度的函数的定量光谱评估。 Franck-Condon对磷光光谱和与温度相关的三重态扩散的分析与解析输运理论相结合,表明与电荷载流子相反,具有主要极化活化能的Marcus型跃迁速率可控制三重态激子在跃迁温度以上的运动。

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