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Spin-dependent spectroscopy of photoexcitations in conducting polymers and fullerenes

机译:导电聚合物和富勒烯中光激发的自旋相关光谱

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Abstract: We have used the novel technique of absorption detected magnetic resonance (ADMR) to investigate the photoexcitation properties in conducting polymers and fullerene C$-60$/ films. In conducting polymers we have identified both charged and neutral long-lived photoexcitations with distinct different properties in polymers with degenerate (trans polyacetylene; t-(CH)$-x$/) and nondegenerate (polyparaphenylene vinylene; PPV) ground state backbone structure. In t-(CH)$-x$/ the photocarriers are charged solitons and the neutral photoexcitations are spin $HLF soliton pairs, whereas the photoexcitations in PPV form charge bipolarons and triplet excitons. The neutral photoexcitations in C$- 60$//polystyrene 'glass' are triplet excitons identified in ADMR through the triplet 'powder-pattern' around g $EQ 2.003.!14
机译:摘要:我们已经使用吸收检测磁共振(ADMR)的新技术来研究导电聚合物和富勒烯C $ -60 $ /膜中的光激发特性。在导电聚合物中,我们已经确定了简并的(反式聚乙炔; t-(CH)$-x $ /)和非简并的(聚对亚苯基亚乙烯基; PPV)​​基态骨架结构的聚合物中带电和中性的长寿命光激发具有明显不同的特性。在t-(CH)$-x $ /中,光载流子带电孤子,中性光激发为自旋$ HLF孤子对,而PPV中的光激发形成双极子和三重态激子。 C $ -60 $ //聚苯乙烯“玻璃”中的中性光激发是在ADMR中通过三元态“粉末模式”在g $ EQ 2.003。!14处识别出的三重态激子。

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