Müller J G, Lemmer U, Raschke G, Anni M, Scherf U, Lupton J M, Feldmann J
Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, 80799 Munich, Germany.
Phys Rev Lett. 2003 Dec 31;91(26 Pt 1):267403. doi: 10.1103/PhysRevLett.91.267403. Epub 2003 Dec 30.
Using low temperature single molecule spectroscopy on rigid-rod conjugated polymers we are able to identify homogeneously broadened, strongly polarized emission from individual chromophore units on a single chain. Gated fluorescence spectroscopy allows real time imaging of intramolecular energy transfer as the chain behaves as a series of weakly interacting chromophores. Energy transfer is controlled by the chromophoric spectral linewidth, which depends on temperature. Linewidths exceeding intramolecular disorder lead to incoherent chromophore coupling and collective fluorescence phenomena.
通过对刚性棒状共轭聚合物进行低温单分子光谱研究，我们能够识别出单链上单个发色团单元发出的均匀展宽、强偏振发射。门控荧光光谱能够实时成像分子内的能量转移，因为该链表现为一系列弱相互作用的发色团。能量转移由发色团光谱线宽控制，而光谱线宽取决于温度。超过分子内无序程度的线宽会导致非相干发色团耦合和集体荧光现象。
