Delayed Luminescence of Organic Mixed Crystals. VII. Intermolecular Triplet Decay Processes

Abstract

Mixed single crystalline specimens of various host‐guest systems have been studied. Host materials were biphenyl, durene, and phenanthrene; guest materials were naphthalene‐h_s and d_s, 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 $T_{\text{1G}}{\mathrm{\rightsquigarrow T}}_{\text{1H}}$ . No other temperature‐dependent $T_{\text{1G}}$ depletive process of any significance has been detected.