Er掺杂PbF2晶体的局域团簇结构与光谱性能研究
Investigation of Localized Cluster Structure and Spectral Properties of Er-Doped PbF2 Crystals
李琳 1张沛雄 1谭俊成 1朱思祁 1尹浩 1李真 1陈振强1
作者信息
- 1. 暨南大学物理与光电工程学院,广州 510632;广东省晶体与激光技术工程研究中心,广州 510632
- 折叠
摘要
本文采用Bridgman法成功生长了一系列Er∶PbF2晶体.利用基于密度泛函理论的第一性原理计算详细研究了Er3+在PbF2晶体中的团簇效应.首次获得了 Er∶PbF2晶体的上转换发光特性(发光强度、颜色变化)与团簇结构之间的关系.研究发现,随着Er3+浓度增加,团簇从单聚体向高阶构型演化,Er3+离子之间的距离先减小后增大,这使得上转换发光中的红色发射强度先增大后减小,红绿发光比也在Er3+浓度高于6.5％(摩尔分数)后逐渐减小,即发光颜色可以从红色调整为黄绿色.该研究证明了稀土离子团簇的结构演化可以调控Er∶PbF2的光谱特性,为多色发光材料的设计提供一种新方法.
Abstract
In this paper,a series of Er∶PbF2 crystals were successfully grown by Bridgman method.The first-principles calculation based on the density functional theory was applied to investigate the clustering effect of Er3+in PbF2 crystals in details.The relationship between the up-conversion(UC)luminescence properties(luminescence intensity,color variation)and the cluster structure in Er∶PbF2 crystals was obtained for the first time.It is found that as Er3+concentration increases,the clusters evolve from monomers to higher-order configurations,with the distance between Er3+ions decreasing and then increasing,resulting in the intensity of the red emission in the UC fluorescence first increasing and then decreasing,and the red-green luminescence ratio also decreases after the Er3+concentration is higher than 6.5％(mole fraction),indicating that the luminescence color can be adjusted from red to yellow-green.This study proves that the structural evolution of rare-earth ion clusters could regulate the spectroscopic properties of Er∶PbF2,which provides a novel method for the design of multi-color luminescent materials.
关键词
Er∶PbF2晶体/上转换发光/密度泛函理论/铒离子团簇/光谱性能Key words
Er∶PbF2 crystal/up-conversion luminescence/density functional theory/erbium cluster/spectral property引用本文复制引用
基金项目
国家自然科学基金(51972149)
国家自然科学基金(61935010)
国家自然科学基金(51872307)
国家自然科学基金(51702124)
国家自然科学基金(62175091)
国家自然科学基金(51702124)
广东省重点领域研究发展计划(2020B0090922006)
广州市科技计划(2024A03J0240)
出版年
2024
国家科技期刊平台
NSTL
万方数据