The effect of Ce3+ concentration and heat treatment on the luminescence efficiency of YAG phosphor. (May 2018)

• Record Type: Journal Article
• Authors: Valiev, Damir; Han, Tao; Vaganov, Vitaly; Stepanov, Sergey
• Is Part Of: Journal of physics and chemistry of solids. Volume 116(2018)
• Page Start: 1
• Page End: 6
• Publication Date: 2018-05
• Subjects: YAG:Ce phosphors -- Energy efficiency -- Luminescent properties -- Heat treatment -- Defects; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2018.01.007
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Y3 Al5 O12 (YAG) phosphor powders doped with Ce 3+ at different concentrations (YAG: x Ce, x = 0.02, 0.04, 0.06, 0.08, 0.1 wt%) were synthesized by the solid-state reaction method with the addition of BaF2 flux. The effects of cerium concentration and heat treatment on the luminescence efficiency of the YAG:Ce 3+ phosphor were investigated. The introduction of Ce 3+ ions leads to an increase in luminescent intensity of the YAG phosphor at 560 nm. The band at 530 nm is attributed to Ce 3+ ions (optical transitions from the 4f–5d excited state). We assumed that such an increase in the luminescent intensity is due to the ability of Ce 3+ to act as a luminescence sensitizer of intrinsic defects in YAG phosphor. The analysis of luminescence decay kinetics in the investigated samples has shown that the decay time in all samples does not differ significantly and equals τ ≈ 60 ± 3 ns. We showed experimentally that increasing the luminescence intensity has an effect observed with relatively low temperature treatment ( T = 400 K). The nature of possible luminescence centers and the effect of low heat treatment on the luminescence properties of the powders are discussed. Highlights: Undoped and Ce 3+ -doped Y3 Al5 O12 phosphor powders were synthesized through the solid-state reaction method. Pulsed photoluminescence spectral and decay characteristics were studied. The slight change in cerium concentration (from 0.02 to 0.1 wt%) leads to significant changes in the luminescence properties of phosphor. Photoluminescence intensity increase at heat treatment temperature of 400 K was observed.