GATED SPECTRAL HOLE-BURNING OF ZN-TETRABENZOPORPHINE IN THE PRESENCE OF VARIOUS ORGANIC ACTIVATORS

The influence of a broad range of solid and liquid additives on the ph oton-gated hole burning has been investigated in toluene-benzene solve nt glass containing Zn-tetrabenzoporphine(ZnTBP) at 8K. Two different mechanisms of gated spectral hole burning have been observed. Photoiso merization of olefines, sensitized by means of energy transfer from th e highly excited triplet level of ZnTBP can lead to the hole formation with the efficiency as high as Phi(2)=5x10(-3) per absorbed gating li ght quantum. Electron transfer processes in the presence of most favou rable accepters (C2Cl6, DDT) and donors (triethylamine) can be realize d with the efficiency Phi(2)=1x10(-3).The quantum yield of the one-col or process is relatively independent on. the composition of the system (Phi(1) similar to 10(-5)). Polymer films activated with the same add itives display comparable hole-burning properties.