一维导电聚合物中激发态的链间弛豫

DEPENDENCE OF INTERCHAIN COUPLING ON INTE- RCHAIN ENERGY TRANSFER IN ONE-DIMENSIONAL POLYMERS

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摘要本文系统地研究了顺式高强聚乙炔的Raman和发光光谱,根据其Raman和发光光谱随激发能量的变化规律,以及分子链之间距离的改变对这种变化规律的影响,证明了聚乙炔中存在着激发态的链间弛豫,井且,这种弛豫过程随着分子链之间距离的减小而被加快. The Raman peaks of high performance cis-rich polyacety]ene(HPPA) shift to higher energies as the excitation energy increases. This implies that a shorter chain can be effectively excited by higher excitation energy, and a longer chain can be effectively excited by lower excitation energy. The blue-shift of the dominant peaks in the Raman spectrum of stretched HPPA compared with that of HPPA is observed, indicating the decrease of the interchain distance due to stretching. The luminescence spectra for HPPA and stretched HPPA with various excitation wavelengths are reported.We find that the luminescence spectrum of HPPA shifts to higher energies with the increase of excitation energy, and this blue-shift of the luminescence spectrum decreases with the decrease of the interchain distance. We suggest that there exists the interchain energy transfer in HPPA, which becomes faster as the interchain distance decreases.