Luminescence of Mn4 + in the Distorted Perovskite Gd2MgTiO6
| Autor: | A. M. Srivastava, W. W. Beers |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Photoluminescence
Renewable Energy Sustainability and the Environment Chemistry Mineralogy Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Crystallography Wavelength Impurity Lattice (order) Materials Chemistry Electrochemistry Luminescence Excitation Perovskite (structure) |
| Zdroj: | Journal of The Electrochemical Society. 143:L203-L205 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.1837087 |
| Popis: | The deep red luminescence of Mn 4+ in the distorted perovskite Gd 2 MgTiO 6 is reported and discussed. The excitation spectrum of Mn 4+ luminescence is dominated by the O 2- to Mn 4+ charge-transfer transition at ∼31,700 cm -1 . The luminescence is due to the 2 E → 4 A 2 transition with the zero-phonon line at ∼14,685 cm -1 and the associated side bands at longer wavelengths. Evidence is presented for the occurrence of multiple Mn 4+ sites in the host lattice. This is attributed to the deviation from a perfect 1 :1 order between the B-site ions (Mg 2+ /Ti 4+ ) of the perovskite lattice. The unactivated host lattice also exhibits Mn 4+ luminescence due to the presence of this ion as an impurity in one of the starting materials (TiO 2 ). Evidence is presented for Gd 3+ to Mn 4+ energy transfer in this host lattice. |
| Databáze: | OpenAIRE |
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