Photon gated persistent spectral hole burning for the meso-tetra-p-tolyl-Zn-tetrabenzoporphyrin/chloroform system in poly(methyl methacrylate): Temperature dependence

Abstract

A high-efficiency photon-gated material undergoing donor-acceptor electron transfer at a fixed temperature of 1.5 K was reported by T. P. Carter et al. (1987). The material was composed of meso-tetra-p-tolyl-Zn-tetrabenzoporphyrin (TZT) or its Mg analog combined with various halomethane acceptors in poly(methyl methacrylate) (PMMA). The efficiency of this photoreaction was shown to be sufficiently high that detectable holes could be formed in 30 ns with focused light from a 10-mW CW red laser, followed by a longer gating pulse in the green. The effect of raising the temperature from 1.5 to 90 K on the photon-gated hole-burning efficiency is investigated. It is shown that the gating ratio is improved from ≅ 102 to 104 as the temperature is raised from 1.5 to 90 K.