1. Photoluminescence and electron spin resonance study on narrow-band UVB emitting Gd-doped LaPO4 phosphors.
- Author
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Singh, Vijay, Venkateswara Rao, B. Rupa, Rao, A.S., Rao, J.L., and Irfan, Muhammad
- Subjects
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ELECTRON paramagnetic resonance , *GADOLINIUM , *PHOSPHORS , *PHOTOLUMINESCENCE , *THERMOLUMINESCENCE , *MOLECULAR spectra - Abstract
A series of trivalent gadolinium (Gd3+) doped lanthanum phosphates (LaPO 4) were prepared by the co-precipitation technique with varying concentrations of Gd3+. The structural properties of the prepared phosphor samples were analyzed by X-ray diffraction (XRD) which showed monoclinic structure of LaPO 4. The photoluminescence (PL) emission spectra of the Gd3+-doped phosphor excited at 272 nm consists of dominant UVB emissions at 312 nm corresponding to the P 7 / 2 → 8 S 7 / 2 6 transitions of Gd3+. The electron spin resonance (ESR) spectra of LaPO 4 :Gd3+ phosphor reveal three significant attributes with effective g-values around 6, 2.8, 2.0 and a feeble characteristic at 4.8 owing primarily to the presence of Gd3+ ions in clustered species. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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