Electric-field-induced modulation of fluorescence from rhodamine 610 dye in a thin plastic film

The influence of strong external electric fields on the fluorescence intensity from rhodamine 610 dye molecules dispersed in a polycarbonate matrix is reported. Differences in dipole moments and electric polarizabilities between the ground and first excited states were obtained from an analysis of the wavelength dependence of the field-modulated fluorescence. A small field-induced decrease in the fluorescence quantum efficiency was also observed.