PHOTOLUMINESCENCE OF POLYSILOXANE CONTAINING MESOGENIC 4-CYANOBIPHENYL IN SOLUTION

Photoluminescent characteristics of polysiloxane containing pendant me sogenic 4-cyanobiphenyl (CB) and its monomeric analogues were studied in THF solution. An excimer formation was observed, and the increase i n CB content in polysiloxane induced the increase in the fluorescence intensity from the excimers. The fluorescence decays were analyzed by triexponential function, A high CB content induced small decay rates, indicating the decrease of nonradiational decay. Such suppression of t he nonradiation decay in higher CB content was explained by a strong m esogenic interaction between CB groups in solution. (C) 1996 John Wile y & Sons, Inc.