Urbach Tail of Organic Dyes in Solution

概要

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Emission excitation spectra have been measured in rhodamine 6G and tetracene insolutions at various temperatures in the low-energy side of the lowest absorptionband. It has been found that the spectrum of rhodamine 6G is well approximated by aGaussian convoluted by an exponential tail, while that of tetracene has shoulders inthe nearly exponential tail. The temperature dependence of the low-energy tail ofrhodamine 6G has been compared with that of the Urbach tail in solids. A long exponential-like tail has also been found in the emission spectrum of rhodamine 6Gover - 5000 cm ' toward the low-energy side. From the analysis of the absorption, excitation and emission spectra, it is shown that both the molecular vibrational modesand the classical mode of the surroundings which has only quadratic interaction withthe dye molecule contribute to these tails.
社団法人日本物理学会の論文
1987-11-15