吕滨,陈鹏,陈红兵,孙志刚,潘建国.Y/Gd/Eu三元稀土层状化合物的离子交换行为与光学性能[J].稀有金属材料与工程,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.]
Y/Gd/Eu三元稀土层状化合物的离子交换行为与光学性能
投稿时间:2017-06-28  修订日期:2017-07-28
中文关键词:  稀土层状化合物  荧光粉  氧化钇  氧化钆  离子交换
基金项目:国家自然科学基金(项目号5170020799), 浙江省自然科学基金(项目号LY17E020002), 浙江省钱江人才计划项目, 宁波市自然科学基金(项目号2017A610011), 宁波大学王宽诚幸福基金
中文摘要:
      采用低温液相沉淀技术合成出硝酸盐类Y/Gd/Eu三元体系的稀土层状化合物,通过自组装获得了花瓣状超薄纳米片,并研究了该化合物的硫酸根离子交换行为和光学性能。研究表明当硫酸根与硝酸根的摩尔比R=0.25时,硫酸根离子可以完全置换层状化合物层间的硝酸根离子。离子交换后层状化合物的发光强度减弱,Gd3+离子掺杂使Eu3+离子的配位环境发生改变,从而导致磁偶极子跃迁5D0→7F1 的两个发射峰的相对强度发生变化。硫酸根离子交换改变了层状化合物的热分解路径,阻碍了煅烧过程中颗粒间的表面扩散,从而获得了高分散的氧化物荧光粉(平均粒度~120 nm),该粉体呈现出Eu3+离子的5D0→7FJ的特征红光。Gd3+离子掺杂有效敏化了氧化物固溶体中Eu3+离子的发光,煅烧温度的提高也进一步增加了粉体的发光强度与量子效率,同时降低了荧光寿命。
Anion-Exchange Behaviors and Optical Properties of Ternary Y/Gd/Eu Layered Rare-Earth Hydroxides
英文关键词:LRH  Phosphor  Yttria  Gadolinia  Ion Exchange
英文摘要:
      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.
作者单位E-mail
吕滨 宁波大学材料科学与化学工程学院 lvbin@nbu.edu.cn 
陈鹏 宁波大学材料科学与化学工程学院 2563603449@qq.com 
陈红兵 宁波大学材料科学与化学工程学院 chenhongbing@nbu.edu.cn 
孙志刚 北京滨松光子技术股份有限公司 szg@bhphoton.com 
潘建国 宁波大学材料科学与化学工程学院 panjianguo@nbu.edu.cn 
摘要点击次数: 78
全文下载次数: 52
查看全文  查看/发表评论  
关闭