Anthracene Crystals Under Intensive Optical Pumping

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Abstract
The fluorescence of a number of anthracene crystals has been studied over a wide range of nitrogen laser optical pumping. The conditions for the separate study of light generation in the plane-parallel anthracene plates and nonlinear fluorescence quenching due to exciton-exciton annihilation have been found. The threshold of generation I n (l) and quenching constant k ss have been found to be substantially dependent on the structural perfection of crystals. The values of I n (1) and K ss are reduced to 4.1019 cm−2 sec−1 and ∼ 10−9 cm3 sec−1 respectively in the most perfect subliminated plates. The decrese in the quenching constant is connected with the nontrivial influence of lattice defects on the process of exciton-exciton annihilation.