Controlled synthesis and the effects of Gd3+ substitution, calcination, and particle size on photoluminescence of (Y0.95-xGdxTb0.05)2O3 green phosphor spheres
Controlled synthesis and the effects of Gd3+ substitution, calcination, and particle size on photoluminescence of (Y0.95-xGdxTb0.05)2O3 green phosphor spheres
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DOI：
10.1016/j.cej.2016.07.078
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发表时间：
2016-12-15
影响因子：
15.1
通讯作者：
Sun, Xudong
中科院分区：
文献类型：
--
作者：
Huang, Sai;Li, Ji-Guang;Sun, Xudong
均匀的球体非常需要用于制造先进的陶瓷以及作为照明和显示用的荧光粉。本文采用均匀沉淀法成功地合成了(Y0.95-xGdxTb0.05)(2)O-3荧光球，重点研究了颗粒尺寸的增大以及颗粒大小、Gd3+掺杂和焙烧对发光性能的影响。硝酸铵最初被用来有效地将前驱体粒子从150+/-10放大到590+/-43 nm，但发现当NH4NO3：稀土=1：1摩尔比时，其效果趋于饱和。尺寸放大到类似于630+/-57 nm也是通过自种子生长方法实现的。发光材料的最佳Gd3+含量为2at%(x=0.02)，由于基质晶格的带隙变窄，F-7(6)-&Gt；(DJTb3+)-D-7在278 nm附近的自旋激发峰随Gd3+含量的升高或焙烧温度的升高而逐渐降低。543 nm绿光发射的强度随着焙烧温度或颗粒大小的增加而稳定提高，543 nm绿光发射的寿命受颗粒大小和焙烧方式的影响，在1.75-2.81ms之间。无论Gd含量、颗粒大小和焙烧温度如何，荧光粉的颜色坐标都相似，约为(0.32，0.56)。(C)2016爱思唯尔B.V.保留所有权利。
Uniform spheres are highly desired for the fabrication of advanced ceramics and as phosphor for lighting and display. Green emitting (Y0.95-xGdxTb0.05)(2)O-3 phosphor spheres were successfully synthesized in this work via homogeneous precipitation, with particular emphases on size enlargement of the particles and the effects of particle size, Gd3+ incorporation and calcination on photoluminescence. Ammonium nitrate (NH4NO3) was originally used to effectively enlarge the precursor particles from similar to 150 +/- 10 to 590 +/- 43 nm, whose effects were found to tend to saturate at NH4NO3:rare-earth = 1:1 molar ratio. Size enlargement up to similar to 630 +/- 57 nm has also been achieved via a self-seeded growth approach. The optimal Gd3+ content for luminescence was determined to be 2 at% (x = 0.02) for the phosphors, and the spin allowed F-7(6)->(DJTb3+)-D-7 excitation at similar to 278 nm successively lowers at a higher Gd3+ content or calcination temperature owing to bandgap narrowing of the host lattice. Intensity of the 543 nm green emission steadily improves with increasing temperature of calcination or particle size, and the lifetime of the 543 nm emission, affected by particle size and calcination, falls in the range of similar to 1.75-2.81 ms. The phosphors have similar color coordinates of around (0.32, 0.56), irrespective of the Gd content, particle size, and calcination temperature. (C) 2016 Elsevier B.V. All rights reserved.