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Published in:
01-09-2014
Effects of co-doped Li+ ions on luminescence of CaWO4:Sm3+ nanoparticles
Published in: Journal of Materials Science: Materials in Electronics | Issue 9/2014
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Abstract
CaWO4, CaWO4:Sm3+ and CaWO4:(Sm3+, Li+) nanoparticles were synthesized by the precipitation method with addition of PEG 200. The X-ray diffraction patterns show that the obtained samples have a pure tetragonal phase. The CaWO4 sample shows an emission peak at 418 nm originating from the charge-transfer transitions within the WO4
2− complex. CaWO4:Sm3+ and CaWO4:(Sm3+, Li+) samples show emission peaks originating from the f–f forbidden transitions of the 4f electrons of Sm3+ ions. The charge compensator of Li+ can enhance the emission intensity effectively. It is found that the emission intensity of CaWO4:(3 mol% Sm3+, 4 mol% Li+) phosphor is about double that of CaWO4:3 mol% Sm3+ phosphor.