荧光粉
发光
材料科学
单斜晶系
热稳定性
钙钛矿(结构)
激发态
分析化学(期刊)
微观结构
晶体结构
光电子学
结晶学
化学
物理
色谱法
有机化学
核物理学
冶金
作者
Zhengdong Wu,Shenghao Ai,Huan Chen,Ting Zhou,Mengjiao Liu,Yan Zhao,Xin Lai,Jian Bi,Daojiang Gao
标识
DOI:10.1016/j.optlastec.2022.107947
摘要
A series of Eu3+-activated double perovskite Na(1-x)Gd(0.95+x/3)MgWO6: 5% Eu3+ (0 ≤ x ≤ 0.5) phosphors were successfully synthesized via sol–gel route, the effects of the variation of x on the microstructure and luminescent properties of the synthesized phosphors were studied in detail. It is found that all of the obtained phosphors are irregular polyhedral crystals with the average grain size of ∼0.5–1 μm, exhibiting a monoclinic double perovskite structure. All of the Na(1-x)Gd(0.95+x/3)MgWO6: 5% Eu3+ (0 ≤ x ≤ 0.5) phosphors can be efficiently excited by blue light (464 nm) and near ultraviolet light (395 nm), showing promising application in white light-emitting diodes. Interestingly, the charge transfer band of the Na(1-x)Gd(0.95+x/3)MgWO6: 5% Eu3+ (0 < x ≤ 0.5) phosphors has slight shift compared with the as-synthesized NaGd0.95MgWO6: 5% Eu3+ phosphor. Upon excitation of 464 nm and 395 nm lights, these phosphors can exhibit the strongest red emission at 615 nm, and the red emission intensity gradually increases with ascending x and then markedly decreases, showing the largest at x = 0.2. Especially, the obtained Na0.8Gd(0.95+1/15)MgWO6: 5% Eu3+ phosphor possesses the best luminescence properties, including the highest emission intensity at room temperature, optimal thermal stability and the better photoelectric parameters for the packaged WLED.
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