Deformation-induced enhancement of Ex-emission in RbI and KI single crystals
Shunkeyev K. Sagimbayeva S. Kenzhebayeva A.
July 2025Elsevier B.V.
Optical Materials: X
2025#27
Drastic changes in the spectra of X-ray luminescence have been detected in pure RbI and KI single crystals exposed to uniaxial elastic deformation at 85 K. The intensity of both the σ-component of self-trapped exciton (STE) emission (maxima at 4.2 and 3.9 eV in RbI and KI, respectively) and the co-called Ex-luminescence (peaked at 3.05 eV in RbI and at 3.1 eV in KI) linearly increases with relative degree of deformation up to ε ≈ 1 %. The similarity of the dependence I = f(ε) for both emissions confirms the intrinsic origin of the Ex-luminescence in KI and RbI. Using a KI:Tl crystal as an example, it has been shown that low-temperature uniaxial elastic deformation causes a reduction in the mean free path of anion excitons, and, in turn, increases the efficiency of their self-trapping at regular lattice sites and subsequent radiative decay of STEs.
Ex-luminescence , RbI and KI crystals , Uniaxial elastic deformation , X-ray luminescence
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K. Zhubanov Aktobe Regional University, 34 A.Moldagulova Ave., Aktobe, 030000, Kazakhstan
K. Zhubanov Aktobe Regional University
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