RELATIONSHIP BETWEEN SPECTRAL HOLE-BURNING AND STOKES SHIFT OF ORGANIC-DYES IN POLYMER SYSTEMS

Several organic dyes were studied both by fluorescence spectroscopy an d by persistent spectral hole burning spectroscopy. The chromophores r ealizing spectral hole formation at 20 K have small Stokes shift appro ximately less than 10(3) cm(-1). It ascertains that the small Stokes s hift related to the existence of appreciable zero-phonon line would be a requisite for the spectral hole formation of the chromophore. The r ealization of hole formation by using poly(vinyl alcohol) or photoreac tive matrices for the chromophores which have appreciable zero-phonon line but don't undergo light-induced chemical or conformational change is also discussed.