Narrow-Band UVB-Emitting Gd-Doped SrY2O4 Phosphors
Abstract
Gadolinium (Gd3+) ion-activated SrY2O4 phosphors with varying concentrations of Gd3+ ions were prepared using sol-gel synthesis. The photoluminescence spectra were recorded to study the luminescence behavior of the as-synthesized phosphors. Upon excitation at 275 nm, the material displayed two bands, one at 309 nm (6P5/2 → 8S7/2) and the other at 315 nm (6P7/2 → 8S7/2), in the narrowband ultraviolet (UV) spectral regions. The strong emission at 315 nm indicated that the phosphors could be used as a narrowband UV light source. Electron paramagnetic resonance spectra showed a foremost Gd3+ center with weak signals. Several resonance signals revealed that Gd3+ ions underwent different Zeeman interactions and exhibited varying crystal field strength. The results suggest the potential utility of Gd3+ doped-SrY2O4 phosphors for phototherapy lamp applications which require UV emission.
- Publication:
-
Journal of Electronic Materials
- Pub Date:
- March 2020
- DOI:
- 10.1007/s11664-020-08032-x
- Bibcode:
- 2020JEMat..49.3025S
- Keywords:
-
- Sol-gel;
- XRD;
- EPR;
- Gd<SUP>3+</SUP> ions;
- SrY<SUB>2</SUB>O<SUB>4</SUB>;
- photoluminescence