Hydrothermal formation and up-conversion luminescence of Er3+-doped GdNbO4
Hydrothermal formation and up-conversion luminescence of Er3+-doped GdNbO4
复制标题
DOI：
10.1111/jace.14835
复制
发表时间：
2017-07-01
影响因子：
3.9
通讯作者：
Ishikawa, Katsuya
中科院分区：
文献类型：
--
作者：
Hirano, Masanori;Ishikawa, Katsuya
采用水热法制备了以单斜铌铁矿结构为主相的Gd 1.00-xErxNbO 4（x=0-0.50）样品，研究了Er 3+掺杂浓度对样品上转换发光性能的影响。在240 ℃弱碱性水热条件下，Er 3+置换掺入GdNbO 4中，形成了单一的Gd1.00-xErxNbO 4固溶体，其单斜相的晶格常数逐渐线性减小，符合Vegard定律。掺2mol%Er ~（3+）的钆酸盐（Gd_（0.98）Er_（0.02）NbO_4）在1300 ℃加热1h后，在波长为254 nm的激发下，在515- 560 nm的绿色光谱区表现出最强的光致发光强度，其晶粒尺寸约为29 nm。在980 nm激发下，Er ~（3+），Gd ~（0.80）Er ~（0.20）NbO ~（4+）浓度为20mol%时，上转换发光强度最大。这些结果表明，材料，Er 3+掺杂的GdNbO 4纳米晶体通过水热路线和后加热制备的具有潜力的上转换荧光体。
The effect of concentration of Er3+ on the up-conversion and photoluminescence properties of Gd1.00-xErxNbO4, x=0-0.50 which has monoclinic fergusonite-type structure as a main phase has been investigated, using a processing technique based on hydrothermal method. Under weakly basic hydrothermal condition at 240 degrees C for 5hours, a single phase of fergusonite-type Gd1.00-xErxNbO4 solid solution was directly formed as nanocrystals by the substitutional incorporation of Er3+ into GdNbO4 because of the gradual and linear decrease in the lattice parameters of the monoclinic phase corresponding to the Vegard's Law. The gadolinium niobate doped with 2mol% Er3+, Gd0.98Er0.02NbO4 after heating at 1300 degrees C for 1hour, which has nanocrystalline structure whose crystallite size is around 29nm, exhibits the highest photoluminescence intensity in the green spectral region, 515-560nm under excitation at wavelength of 254nm. On the other hand, the up-converted luminescence intensity of the niobate nanocrystals becomes the maximum at the concentration of 20mol% Er3+, Gd0.80Er0.20NbO4 under excitation at 980nm. These results demonstrate that the material, Er3+-doped GdNbO4 nanocrystals prepared through hydrothermal route and postheating has potential for up-converting phosphor.