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

1.Faculty of Materials Science and Chemical Engineering,Ningbo University;2.Beijing Hamamatsu Photonics Technology Co., Ltd

Clc Number:

TQ050.4

Fund Project:

National Natural Science Foundation of China (Grant No. 5170020799), Zhejiang Provincial Natural Science Foundation of China (Grant No. LY17E020002),

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    Abstract:

    Self-assembly layered rare-earth hydroxide (LRH) nanosheets of ternary Y/Gd/Eu system were synthesized at freezing temperature by a chemical precipitation route. The anion-exchange behaviors and optical properties of the LRHs were studied. At the SO42-/Ln3+ molar ratio (R) of 0.25, the SO42- almost repalces the NO3- located in the interlayer of the LRH via anion exchange, however, the photoluminescence (PL) intensity decreases. Gd3+ substitution for Y3+ has significantly changed the coordination environment of Eu3+, leading to different intensities for the splitting bands of 5D0→7FJ transition peaking at ~590 and 595 nm. Sulfate exchange inhibits surface diffusion and inter-particle sintering during calcination and well-dispersed oxide powders that exhibit typical Eu3+ red emission were hence obtained. Gd3+ addition sensitizes Eu3+ emission to enhance the PL intensity of the phosphors. Improved PL intensity and external quantum efficiency and decreasing fluorescence lifetime were observed at a higher calcination temperature.

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[Lu Bin, Chen Peng, Chen Hongbing, Sun Zhigang, Pan Jianguo. Anion-Exchange Behaviors and Optical Properties of Ternary Y/Gd/Eu Layered Rare-Earth Hydroxides[J]. Rare Metal Materials and Engineering,2019,48(2):559~565.]
DOI:10.12442/j. issn.1002-185X.20170574

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History
  • Received:June 28,2017
  • Revised:July 28,2017
  • Adopted:August 18,2017
  • Online: March 15,2019
  • Published: