Abstract

We have observed photon-gated persistent spectral hole burning (PHB)¹ for both Zn and Mg meso-tetra(p-tolyl)tetrabenzoporphyrin [TZT and TMT, respectively (the structure of TZT is given in Fig. 1)] in films of monodisperse polymethyl methacrylate (PMMA) having a residual amount of halomethane solvent (CHCl₃, CH₂Cl₂, or CH₂Br₂). Films prepared in conditions which eliminate the excess solvent do not exhibit photon gating but do show weak one-color PHB. This is the first dear observation of a photon-gated PHB system involving electron transfer from an excited donor to an acceptor whose concentration can be modified, thereby affecting the electron transfer and hole-burning efficiency.

© 1987 Optical Society of America