Luminescence Lines Due to the n=2 Free Exciton State of Wannier Series in KI Crystals

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  • Luminescence Lines Due to the <I>n</I>=2 Free Exciton State of Wannier Series in KI Crystals
  • Luminescence Lines Due to the n 2 Free

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A resonance luminescence line and its LO phonon side bands due to n=2 free excitons in KI are studied. Main results of measurements; (1) the resonance luminescence line is located at 6.186 eV which corresponds closely to the peak position of the zero phonon absorption line due to n=2 excitons, (2) the shape of the line is symmetric Lorentzian with 1.6 meV width, (3) the quantum yield is 1×10−5, (4) the height of the potential barrier between the n=2 free exciton state and self-trapped exciton states is 3.0 meV, (5) the self-trapping probability by a tunnel process through the potential barrier is 2×1011 sec−1 and (6) the scattering probability from the n=2 free exciton state to the n=1 free exciton state is 2×1011 sec−1. Furthermore, it is concluded that so called σ(4.12 eV) luminescence and π(3.31 eV) luminescence are emitted from the self-trapped exciton states due to the n=2 exciton state.

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