Abstract
We present the temperature dependent photoluminescence of sodium cryptand sodide. Both the time-integrated and time-resolved line shapes red-shift as temperature increases. At a fixed energy the fluorescence rises faster at higher temperature. Both of these effects are understood in terms of thermal widening of the exciton–polariton (EP) population. However, we report that the temporal evolution of the spectrally integrated fluorescence is independent of the temperature. Combined with the fact that the photoluminescence intensity at elevated temperatures decreases, this observation is evidence that some of the EPs annihilate very early before they begin to evolve.
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