Abstract
AbstractLuminescence characteristics of KI:Eu2+ crystals are studied at 11.5–300 K under excitation in the 3.0–6.3 eV energy range. Besides the known 2.88 eV emission of Eu2+vc– centers, the new emission bands peaking at ∼3.75 eV, ∼3.3 eV, 3.06 eV, and 2.38 eV are found. The bands, located in the 3.1–4.3 eV energy range and strongly distorted due to their overlap with the Eu2+vc– absorption bands, are ascribed to the self‐trapped exciton emission. The 3.06 eV and 2.88 eV bands are ascribed to the electronic transitions from two close levels of the splitted T2g excited state of an Eu2+ ion. The 2.38 eV emission is ascribed to the radiative decay of an exciton localized near an Eu2+ ion. It is assumed that the appearance of the self‐trapped exciton emission under excitation in the Eu2+‐related absorption bands is connected with the radiative decay of excitons, which are formed at the recombination of electrons and holes, produced in the crystal as a result of the photostimulated charge transfer from the Eu2+‐perturbed I– states. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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