Luminescence enhancement in the Sr2ZnW1-xMoxO6:Eu3+,Li+ phosphor for near ultraviolet based solid state lighting
Luminescence enhancement in the Sr2ZnW1-xMoxO6:Eu3+,Li+ phosphor for near ultraviolet based solid state lighting
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用于近紫外固态照明的 Sr2ZnW1-xMoxO6:Eu3,Li 荧光粉的发光增强
DOI：
10.1016/j.jallcom.2016.06.255
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发表时间：
2016-11-15
影响因子：
6.2
通讯作者：
Brik, M. G.
中科院分区：
文献类型：
--
作者：
Li, Li;Pan, Yu;Brik, M. G.
采用高温固相反应法合成了Sr 1. 9 ZnW 1-xMoxO 6：0. 05 Eu（3+），0. 05 Li（+）系列荧光粉。研究了该荧光粉的结构、紫外-可见漫反射光谱、光致发光和衰减特性随W/Mo比的变化。所有制备的混合化合物具有立方结构。光谱实验结果表明，这些荧光粉的激发带都在近紫外区，随着Mo浓度的增加，这些激发带发生红移。在614和595 nm处分别观察到强红光和弱橙红光发射，表明Eu 3+占据了非中心对称位置。Mo的共掺杂可以增强发光强度，最佳掺杂浓度确定为x = 0.4。第一原理计算与实验光谱测量相结合，证实了所制备的磷光体的间接带隙特性，并允许估计其带隙值。结果表明，Sr_2ZnW_（1-x）Mo_xO_6荧光粉在近紫外激发的白色发光二极管中具有很好的应用前景。(C)© 2016 Elsevier B. V.版权所有。
A series of the Sr1.9ZnW1-xMoxO6:0.05Eu(3+),0.05Li(+) phosphors was synthesized by high-temperature solid-state reaction method. The structure, ultraviolet-visible diffuse reflectance spectra, photoluminescence and decay properties of the phosphors were investigated as a function of the W/Mo ratio. All prepared mixed compounds have a cubic structure. The experimental spectroscopic results show the excitation bands of these phosphors is in the near ultraviolet region; the red-shift of these bands is observed upon increase of the Mo concentration. The strong red and weak orange-red emissions centered at 614 and 595 nm, respectively, were observed, which indicates that Eu3+ occupies the non-centrosymmetric site. Co-doping with Mo can enhance the luminescent intensity and the optimal concentration was determined to be x = 0.4. Combination of the first-principles calculations with the experimental spectroscopic measurements confirmed an indirect band gap character for the prepared phosphors and allowed for estimation of their band gap value. The obtained results show that the Sr2ZnW1-xMoxO6 phosphors have considerable potential for the near ultraviolet excited white light emitting diodes. (C) 2016 Elsevier B.V. All rights reserved.