The free exciton luminescence of KI is analysed in the polariton framework. The structure of the 0 L.O line and its L.O phonon replica can be explained by a spatial distribution effect, due to the fact that the polaritons are transformed into photons at the surface of the crystal with a probability function of their energy. The new very weak emission we detected at 6 eV is attributed to the upper branch polariton.
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A. Nouailhat (1981) studied this question.
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