PHOTON-GATED SPECTRAL HOLE-BURNING AND LUMINESCENCE LINE NARROWING OFZINC TETRAPHENYLCHLORIN IN POLYMETHYLMETHACRYLATE AND IN POLYSTYRENE

We have synthesized zinc tetraphenylchlorin (ZnTPC) by diimide reducti on of tetraphenylporphyrin. We have observed photon-gated persistent s pectral hole-burning for zinc tetraphenylchlorin in polymethylmethacry late at liquid helium temperature. Even in absence of any acceptor add itive, the hole formation is up to 5-6 times more efficient when two c olours are absorbed by ZnTPC as compared to one colour excitation. Con versely, no gating effect was observed when ZnTPC is dispersed in poly styrene host matrices. On the other hand, the vibration spectra of ZnT PC in PMMA and PS were recorded using site-selection fluorescence and excitation techniques. (C) 1998 Elsevier Science B.V. All rights reser ved.