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Y/Gd/Eu三元稀土層狀化合物的離子交換行為與光學(xué)性能
作者:
作者單位:

1.寧波大學(xué)材料科學(xué)與化學(xué)工程學(xué)院;2.北京濱松光子技術(shù)股份有限公司

作者簡介:

通訊作者:

中圖分類號:

TQ050.4

基金項目:

國家自然科學(xué)基金（項目號5170020799）, 浙江省自然科學(xué)基金（項目號LY17E020002）, 浙江省錢江人才計劃項目, 寧波市自然科學(xué)基金（項目號2017A610011）, 寧波大學(xué)王寬誠幸?；?/p>


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

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

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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    摘要:

    采用低溫液相沉淀技術(shù)合成出硝酸鹽類Y/Gd/Eu三元體系的稀土層狀化合物，通過自組裝獲得了花瓣狀超薄納米片，并研究了該化合物的硫酸根離子交換行為和光學(xué)性能。研究表明當(dāng)硫酸根與硝酸根的摩爾比R=0.25時，硫酸根離子可以完全置換層狀化合物層間的硝酸根離子。離子交換后層狀化合物的發(fā)光強(qiáng)度減弱，Gd3+離子摻雜使Eu3+離子的配位環(huán)境發(fā)生改變，從而導(dǎo)致磁偶極子躍遷5D0→7F1 的兩個發(fā)射峰的相對強(qiáng)度發(fā)生變化。硫酸根離子交換改變了層狀化合物的熱分解路徑，阻礙了煅燒過程中顆粒間的表面擴(kuò)散，從而獲得了高分散的氧化物熒光粉（平均粒度~120 nm），該粉體呈現(xiàn)出Eu3+離子的5D0→7FJ的特征紅光。Gd3+離子摻雜有效敏化了氧化物固溶體中Eu3+離子的發(fā)光，煅燒溫度的提高也進(jìn)一步增加了粉體的發(fā)光強(qiáng)度與量子效率，同時降低了熒光壽命。

    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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引用本文

呂濱,陳鵬,陳紅兵,孫志剛,潘建國. Y/Gd/Eu三元稀土層狀化合物的離子交換行為與光學(xué)性能[J].稀有金屬材料與工程,2019,48(2):559~565.[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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  • 收稿日期:2017-06-28
  • 最后修改日期:2017-07-28
  • 錄用日期:2017-08-18
  • 在線發(fā)布日期: 2019-03-15
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