Influence of Cu2+ and Cu3+ Cations on the Optical Properties of Bi12SiO20:Cu
P. Petkova, S. Petkov and J. Tacheva
Shumen University "Konstantin Preslavsky", 115 Universitetska str., 9712 Shumen, Bulgaria
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The absorption spectrum of Bi12SiO20:Cu is measured in the spectral region 0.195-2.95 eV. The validity of the Urbach rule (2.08-2.95 eV) has been also verified. The photochromic effect of these samples in far IR region is investigated. The energy level diagram of Cu3+ cations in Bi-octahedrons is presented.
DOI: 10.12693/APhysPolA.121.149
PACS numbers: 78.20.Ci, 78.30.-j, 78.40.-q