Abstract
We have studied the low temperature (15–300 K) spectroscopic properties of Bi3+ impurities in the pyrochlore Y2Ti2O7. The spectroscopic properties of Y2Ti2O7:Bi3+ are interpreted on the basis of the Bi3+(6s2)–Ti4+(4d0) metal-to-metal charge transfer transition that is caused because the Bi3+ 1S0 ground state (6s2) energy occurs at about 0.40 eV from the top of the O2− 2p band (valence band). The reason for the low quenching temperature of the charge transfer luminescence is established. A comparative study of the Bi3+ luminescence in the pyrochlores Y2Ti2O7, Y2Sn2O7 and La2Zr2O7 is presented. The Bi3+ 1S0 ground state (6s2) energy is located about 0.46 eV from the top of the O2− 2p band in La2Zr2O7.
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