Luminescence and relaxed excited state origin in CsI:Pb crystals |
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Authors: | V Babin A Krasnikov K Nitsch S Zazubovich |
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Institution: | a Institute of Physics, University of Tartu, Riia Street 142, 51014 Tartu, Estoniab Institute of Physics AS CR, Cukrovarnicka 10, 16253 Prague, Czech Republic |
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Abstract: | Emission and excitation spectra, luminescence polarization and decay kinetics have been studied for CsI:Pb crystals in the 0.36-300 K temperature range. The origin of the excited states responsible for the optical characteristics has been discussed. It has been concluded that the doublet ≈3.70 eV absorption (excitation) band is caused by the electronic transitions into the Pb2+ triplet state split due to the presence of a cation vacancy near a Pb2+ ion, while the higher-energy bands are of the charge-transfer origin. Like in CsI:Tl, four emission bands of CsI:Pb have been found to belong to the main luminescence centres. Two emission bands, peaking at 3.1 and 2.6 eV, are suggested to arise from the triplet relaxed excited state of a Pb2+ ion. Two visible emission bands, peaking at 2.58 and 2.23 eV, are interpreted as the luminescence of an exciton localized near the Pb2+ ion. |
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Keywords: | CsI:Pb |
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