Self-trapped states and the related luminescence in PbCl${}_2$ crystals

Abstract

We have comprehensively investigated localized states of photoinduced electron-hole pairs with electron-spin-resonance technique and photoluminescence (PL) in a wide temperature range of 5-200 K. At low temperatures below 70 K, holes localize on Pb${}^{2+}$ ions and form self-trapping hole centers of Pb${}^{3+}$. The holes transfer to other trapping centers above 70 K. On the other hand, electrons localize on two Pb${}^{2+}$ ions at higher than 50 K and form self-trapping electron centers of Pb${}_2$${}^{3+}$. From the thermal stability of the localized states and PL, we clarify that blue-green PL band at 2.50 eV is closely related to the self-trapped holes.

8 pages (10 figures), ReVTEX; removal of one figure, Fig. 3 in the version 2

References in corpus (1)

• Self-trapped electrons and holes in PbBr${}_2$ crystals

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