Abstract
The low temperature spectroscopic properties of Mn4+ (3d3) in the orthorhombic perovskite, LaInO3, is examined in this work. The exchange charge model of crystal-field theory is used to calculate the Mn4+ energy levels. The spectra can be fitted by the parameters Dq = 1776 cm−1, B = 700 cm−1 and C = 3189 cm−1, with C/B = 4.5. Discussions pertaining to the low luminescence efficiency of LaInO3:Mn4+ are presented. A comparative study of the variations in the energy of the 2Eg→4A2g emission transition in a series of materials with the perovskite structure is presented. The data suggest a relationship between the energy of the 2Eg→4A2g emission transition and the deviation of the octahedral O-Mn-O bond angle from the ideal 90°. It is concluded that the angular distortion is not large enough to support the development of high luminosity Mn4+ activated phosphors in the ABO3 perovskite family of materials.
| Original language | English |
|---|---|
| Pages (from-to) | 398-402 |
| Number of pages | 5 |
| Journal | Journal of Luminescence |
| Volume | 206 |
| DOIs | |
| Publication status | Published - Feb 2019 |
| Externally published | Yes |
Keywords
- Crystal-field theory
- LaInO
- Luminescence
- Mn
- MnO distortion
- Perovskite
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