Effect of Pressure on Naphthalene-d8 Phosphorescence in Durene Crystals

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Abstract
The phosphorescence lifetime of C10D8 in durene mixed crystals has been studied in the temperature range 77–320°K and under pressures of 0–30 kbar. Matrix compression to 30 kbar shortens the triplet lifetime at 77°K about 20%. At higher temperatures where thermally activated quenching is evident, the triplet decay is very sensitive to pressure and becomes nonexponential with increasing pressure. Compression decreases the activation energy and high concentrations of defects increase the pre‐exponential factor. The phosphorescence quenching is ascribed to charge‐transfer interaction with the host molecules at structural defects in the crystal lattice.