On the 'Bi3+–Ti4+' charge transfer transition in the pyrochlore Y2Ti2O7:Bi3+
| Autor: | S.J. Camaradello, Holly Ann Comanzo, A.M. Srivastava |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Quenching (fluorescence) Condensed matter physics Organic Chemistry Pyrochlore Charge (physics) engineering.material Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Inorganic Chemistry Impurity engineering Valence band Electrical and Electronic Engineering Physical and Theoretical Chemistry Atomic physics Luminescence Ground state Spectroscopy |
| Zdroj: | Optical Materials. 48:31-35 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2015.07.020 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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