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Spectral and thresholds lasing characteristics of the dye doped steroid cholesteric liquid crystals

Igor Ilchishin Pavlovich

Institute of physics NAS of Ukraine

Absorption spectra, fluorescence spectra and quantum yields of dyes of various classes in cholesteric liquid crystals (CLC) and in isotropic solutions as well as the thresholds of their lasing in CLC were investigated. The increase of quantum yields of dyes in concentrated CLC-solution in comparison with diluted isotropic ones are established for the first time. It has been shown that neutral phenolenone dyes with voluminous terminal groups which hinder aggregation of their molecules in concentrated solutions.

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