A NEW PERSISTENT PHOTON-GATED SPECTRAL HOLE-BURNING SYSTEM - ZINC TETRAPHENYLPORPHYRIN LINKED TO POLYVINYL-BENZYLCHLORIDE-CO-POLYSTYRENE

Two colour photon-gated persistent spectral hole-burning via donor-acc eptor electron transfer is reported in systems where the donor: zinc t etraphenylporphyrin (ZnTPP) and the acceptor: vinylbenzyl-chloride whe re linked to a polystyrene chain. A spectral hole is observed when the sample is irradiated using a gating light in addition to the waveleng th-selective light. No effect of the gating light has been observed fo r ZnTPP dispersed in polystyrene (PS) even with efficient accepters. I n contrast, the efficiency of hole formation under two colour excitati on is four times larger than that under one colour excitation in ZnTPP -PBCS/PMMA and nearly two times larger in ZnTPP-PBCS/PS.