Redshift and thermal quenching of Ce 3+ emission in (Gd, Y) 3 (Al, Si) 5 (O, N) 12 oxynitride garnet phosphors
Optical Materials(2019)
摘要
The luminescence properties of Ce3+-doped GdxY3-xAl5-ySiyO12-yNy (x = 0, 1 and 2; y = 0.25) oxynitride garnet phosphors were investigated and compared with corresponding oxide garnet phosphors (y = 0). The measured photoluminescence spectra exhibit redshift of the emission peak wavelength by the partial nitridation of oxide garnet phosphors because of the strong crystal field splitting and the nephelauxetic effect. Temperature dependence studies of the photoluminescence intensity revealed that the quenching temperature decreased by partial nitridation and Gd substitution. The thermal activation energy, estimated from temperature dependence of the fluorescent lifetime, was found to decrease from 0.85 eV (x = 0, y = 0) to 0.27 eV (x = 2, y = 0.25).
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关键词
Nephelauxetic effect,Nitridation,Garnet,Redshift,Phosphor,Cerium
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