A comparison study on the substitution of Y <sup>3+</sup> −Al <sup>3+</sup> by M <sup>2+</sup> −Si <sup>4+</sup> (M = Ba, Sr, Ca, Mg) in Y <sub>3</sub> Al <sub>5</sub> O <sub>12</sub> : Ce <sup>3+</sup> phosphor
Junjie Jia, Yaochun Qiang, Jianfei Xu, Mingzhang Liang, Wei Wang, Fengli Yang, Jun Cui, Quan Dong, Xinyu Ye
Abstract
Abstract Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ (M = Ba, Sr, Ca, Mg) phosphors were successfully prepared through a classic solid‐state reaction method. The crystal structures, photoluminescence spectra, quantum yields, and thermal stabilities of the phosphors were investigated in detail. The results indicate that all Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ phosphors maintain the crystal structure of garnets. The emission peaks of Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ (M = Ba, Sr, Ca, Mg) phosphors are located at 537, 538, 554, and 565 nm, respectively. A red‐shift trend of emission peak is observed with decreasing M radius, which can be ascribed to the increase in the crystal‐field splitting in the Ce 3+ 5 d level owing to the co‐doping of M 2+ −Si 4+ . Under 460 nm excitation, the luminescence quantum yields and thermal stabilities of the Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ phosphors decreased with the decrease of M radius. The IQE of the Y 1.94 BaAl 4 SiO 12 :0.06Ce 3+ phosphor is 92.89%, and the resistance to thermal quenching is improved to be 93.32% at 150°C. In addition, the color shifts of Y 1.94 MAl 4 SiO 12 : 0.06Ce 3+ phosphors with increasing temperature are all tiny, which also demonstrates good resistance to thermal quenching of luminescence. The linear shrinkage of Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ phosphors is significantly improved compared with that of YAG: Ce 3+ , which is expected to generate Y 1.94 MAl 4 SiO 12 :0.06Ce 3+ transparent/translucent ceramics and fabricate high‐powder w‐LEDs for high‐quality solid‐state lighting in the future.