Anion-Exchange Behavior and Optical Properties of Ternary Y/Gd/Eu Layered Rare-Earth Hydroxides

被引：0

作者：

Lu Bin ^{[1
]}

Cheng Peng ^{[1
]}

Chen Hongbing ^{[1
]}

Sun Zhigang ^{[2
]}

Pan Jianguo ^{[1
]}

机构：

[1] Ningbo Univ, Key Lab Photoelect Mat & Devices Zhejiang Prov, State Key Base Funct Mat & Its Preparat Sci, Ningbo 315211, Zhejiang, Peoples R China

[2] Beijing Hamamatsu Photon Technol Co Ltd, Langfang 065001, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2019年 / 48卷 / 02期

关键词：

LRH; phosphor; yttria; gadolinia; ion exchange; LUMINESCENCE PROPERTIES; COLLOIDAL SPHERES; TRANSPARENT; PHOTOLUMINESCENCE; FABRICATION; GD; SUBSTITUTION; PARTICLES; FAMILY; X=0-1;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Self-assembly layered rare-earth hydroxide (LRH) nanosheets of ternary Y/Gd/Eu system were synthesized by a chemical precipitation route at freezing temperature. The anion-exchange behavior and optical properties of the LRHs were studied. The results show that at the SO42-/Ln(3+) molar ratio (R) of 0.25, the SO42- almost replaces the NO3- located in the interlayer of the LRH via anion exchange; however, the photoluminescence (PL) intensity decreases. Gd3+ substitution for Y3+ significantly changes the coordination environment of Eu3+, leading to different intensities for the splitting bands of D-5(0)-> F-7(J) transition peaking at similar to 590 and 595 nm. Sulfate exchange inhibits surface diffusion and inter-particle sintering during calcination, and thus well-dispersed oxide powders that exhibit typical Eu3+ red emission are obtained. The Gd3+ addition sensitizes Eu3+ emission to enhance the PL intensity of the phosphors. Improved PL intensity and external quantum efficiency and decreased fluorescence lifetime are observed at higher calcination temperatures.

引用

页码：559 / 565

页数：7

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