Line Shapes of Zero Phonon and LO Phonon Assisted Luminescence Due to Free Excitons in KI and RbI Crystals

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Abstract
In addition to the zero phonon resonance line of the luminescence due to free excitons in the lowest energy band, a few very weak luminescence lines assisted by LO phonons are observed in KI and RbI crystals. The shapes of the zero phonon and LO phonon assisted luminescence lines are studied under the UV light excitation in the first exciton absorption band at a temperature range between 80 K and 3 K. The zero phonon and LO phonon lines in KI and the zero phonon line in RbI are of symmetric Lorentzian shapes below 10 K. They become asymmetric shapes (nearly Maxwellian) above 10 K. Half-widths of the zero phonon and LO phonon lines in both crystals are about 1.4 meV and 4∼5 meV at 3 K, respectively.

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