Satellite holes of dye molecules doped in polymer films: intermolecular hydrogen-bond effect

We have studied the nonphotochemical hole-burned spectra of dye molecules in polyvinyl alcohol films, where the dye molecule contains a BF2 functional group. An intense satellite hole that possibly corresponds to B-F bending is observed. The excitation into the B-F vibronic transition makes the rearrangement of the configurations of the host more efficient via the intermolecular hydrogen bond. In addition, temperature-annealing-cycling results show that the same magnitude of the electron-phonon coupling determines the electronic zero phonon hole (ZPH) and the vibronic satellite hole (SH), even in the presence of the intermolecular hydrogen bond. The hole intensity ratio of the SH to the ZPH suggests that the lowest absorption band consists of at least two prominent absorption components.