DELAYED LUMINESCENCE OF ORGANIC MIXED CRYSTALS .7. INTERMOLECULAR TRIPLET DECAY PROCESSES

Mixed single crystalline specimens of various host-guest systems have been studied. Host materials were biphenyl, durene, and phenanthrene; guest materials were naphthalene-h8 and d8, phenanthrene-d10 and h10, and chrysene. Primary attention was paid to the temperature dependence of first-order guest phosphorescence decay rates. It has been shown that the guest triplet depletive route is intermolecular and that it involves a thermally stimulated process T1G T1H. No other temperature-dependent T1G depletive process of any significance has been detected.