Abstract

Triplet excitons in AgBr are observed in photoluminescence at low temperatures with continuous near UV-excitation. The triplet exciton emission intensity varies strongly with temperature and excitation density. In particular this latter dependence supports the interpretation that these triplet excitons show Bose-Einstein condensation. The experiments also allow a determination of the critical temperature Tc. At low exciton densities φ,Tc changes according to the ideal gas behaviour (~φ2/3) but differently at high exciton densities. By analysing the experimental data we arrive at some general conclusion about the observability of Bose-Einstein condensation of excitons.

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