Decay of two indirect excitons to direct and to indirect exciton state in thallous halides
Emissions from highly purified TIC1 and TlBr are studied. The emission due to the radiative decay of the molecule of X 6 + xR 6 − excitons by leaving one X 6 + xR 6 − exciton and one M-point phonon through indirect process is found in the vicinity of the absorption edge. The emission due to the radiative decay of two X 6 + xR 6 − excitons at the same M-point with leaving one X 6 + xX 6 − exciton at the P-point through zero-phonon process is observed at the energy far lower than the edge.
KeywordsRadiative Decay Excitation Intensity Exciton State Edge Emission Hydrogen Halide
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