Exciton luminescence spectra of ZnO crystals at 10–300 K were studied. Anomalous temperature dependences characteristic of exciton–phonon luminescence (EPL) of free excitons was observed in several ZnO samples at >150 K and could be interpreted as the manifestation of exciton–electron coupling. Temperature dependences of EPL of free excitons were closely related to defects and general destruction of the crystal translational symmetry so that a nondestructive quality-control method was needed. The conditions for recording unusual ZnO luminescence spectra associated with inelastic scattering of free excitons accompanied by emission of excited excitons and exciton–phonon complexes were described.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 86, No. 4, pp. 505–509, July–August, 2019.
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Nikitenko, V.A., Kokin, S.M. & Stouyhin, S.G. Anomalous Temperature Dependences of Free-Exciton Luminescence Spectra in ZnO. J Appl Spectrosc 86, 567–571 (2019). https://doi.org/10.1007/s10812-019-00860-y
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DOI: https://doi.org/10.1007/s10812-019-00860-y