A detailed interpretation of exciton lines caused by the presence of a lithium impurity in ZnO crystals (T = 4.2 K) was carried out. The 368.5-nm line is caused by radiative recombination of excitons bound on neutral donor states \( {Li}_i^{\times } \). The 371.2-nm line is caused by the same process but occurring simultaneously with the transition of the donor to the excited state. The 368.2-nm line occurs when excitons bound on ionized \( {Li}_i^{+} \) states emit. The 369.7-nm line is the emission of excitons bound on acceptor complexes of the form (\( {Zn}_i^{+}{Li}_{Zn}^{\mid } \)), (\( {In}_{Zn}^{+}{Li}_{Zn}^{\mid } \)), (\( {Li}_i^{+}{Li}_{Zn}^{\mid } \)), etc. The measurements also made it possible to calculate the ionization energy of shallow donors \( {Li}_i^{\times } \) as Ed = 0.033 eV. Thus, a method for exciton spectroscopy of lithium states affecting the optical and electrophysical characteristics of zinc oxide has been developed.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 5, pp. 714–718, September–October, 2020.
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Nikitenko, V.A., Kokin, S.M., Stoyukhin, S.G. et al. Role of Lithium in the Formation of Exciton Luminescence of Zinc Oxide. J Appl Spectrosc 87, 796–799 (2020). https://doi.org/10.1007/s10812-020-01072-5
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DOI: https://doi.org/10.1007/s10812-020-01072-5