Abstract
Photoluminescence (PL) in two broad bands at 2.95 and 2.6 eV in lithium iodate α-LiIO3 is associated with self-trapped excitons and native point defects (supposedly oxygen vacancies), respectively, based on the luminescence excitation spectra and the PL temperature dependence. Free charge carriers may be captured by two types of shallow traps with thermal activation energies of 0.14 and 0.21 eV: they are responsible for crystal darkening at temperatures below 200 K. Spontaneous emission of α-LiIO3 during cooling or heating at temperatures T<200  K is pyroluminescence, which occurs at dielectric breakdown in strong pyroelectric fields on the crystal surface and in its bulk as well as inside the channel defects.
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