Investigation of Triplet-State Energy Transfer and Triplet—Triplet Annihilation in Organic Single Crystals by Magnetic Resonance and Emission Spectra: Diphenyl Host

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Abstract
Temperature and concentration dependence of the decays of the paramagnetic resonance signals from various guest molecules in their triplet states were studied extensively in diphenyl and diphenyl‐d10 host. Temperature‐dependent and ‐independent delayed fluorescence spectra of the various guest molecules and their lifetimes were also studied. The observations are discussed in terms of three types of triplet‐state energy transfer and triplet—triplet annihilation. The rates of transfer and activation energies were determined for the temperature‐dependent part of the triplet‐state energy transfer. The rates are discussed in connection with the triplet exciton interaction in single diphenyl crystals.