单个β-NaYF_(4):Yb^(3+)/Er^(3+)/Tm^(3+)微米晶体上转换白光发射光谱偏振特性研究  

Polarization Characteristics of Upconversion White Light Emission Spectra from a Singleβ-NaYF_(4):Yb^(3+)/Er^(3+)/Tm^(3+)Microcrystal

作　　者：韩庆艳 樊世星 赵博超 刘紫晗 张昊 高伟 张成云 张智喻 刘思聪 董军 HAN Qingyan;FAN Shixing;ZHAO Bochao;LIU Zihan;ZHANG Hao;GAO Wei;ZHANG Chengyun;ZHANG Zhiyu;LIU Sicong;DONG Jun(School of Electronic Engineering,Xi′an University of Posts and Telecommunications,Xi′an 710121,China)

机构地区：[1]西安邮电大学电子工程学院,西安710121

出　　处：《光子学报》2025年第3期231-241,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.12004304,12274341,12104366);陕西省自然科学基金(No.2022JZ-05);陕西省基础研究项目(No.23JSY007);陕西省重点研发计划(Nos.2022SF-333,2022GY-210);陕西省教育厅自然科学基金(Nos.2022 JQ-638,23JK0668)。

摘　　要：采用水热和离子共掺杂方法制备了β-NaYF_(4):20%Yb^(3+)/x%Er^(3+)/0.2%Tm^(3+)(x=0.2,0.4,0.6,0.8,1.0)微米晶体,该微晶是一种横截面为六边形,两端均为楔形的管状结构。调节Er^(3+)离子和Tm^(3+)离子的掺杂浓度比,实现了单颗粒微晶上转换发光颜色从黄绿色到白青色的转变,最终获得了较强的上转换白光发射。采用共聚焦显微光谱测试系统,在近红外光980 nm激光激发下,研究了单颗粒β-NaYF_(4):20%Yb^(3+)/0.2%Er^(3+)/0.2%Tm^(3+)微晶的光谱偏振特性。当激发光位于单个β-NaYF_(4)微晶不同位置时,单个微晶的上转换白光发射强度随偏振角ω变化而展现出不同的周期性变化,表明单个β-NaYF_(4)微晶上转换发光具有较强的偏振依赖特性。该项工作为完善单个各向异性上转换微纳晶体的空间取向分析和发光机理研究提供实验依据。Lanthanide-doped Upconversion Luminescent(UCL)materials have attracted significant attention due to their distinctive optical properties,including excellent photostability,large anti-stokes shifts,high signal-to-noise ratios,and long emission lifetimes.These characteristics make UCL materials highly suitable for a wide range of applications,such as white light-emitting diodes,solid-state laser,and liquid crystal displays.Recently,white light emission from lanthanide-doped UCL materials has exhibited significant potential for applications in three-dimensional backlight technology.Upconversion white light is generally achieved by fine-tuning the emission intensities of red,green,and blue light.The red and green emission can be effectively modulated by varying the concentrations of Er^(3+)or Ho^(3+)ions,while the blue emission intensity is directly influenced by the concentration of Tm^(3+)ions.However,the effective regulation of the UCL spectrum and a deep understanding of its emission mechanisms remain significant scientific issues.Most researches on UCL have focused on the optical properties of micro/nanoparticle ensembles,where the collected spectra reflect an averaged emission effect from a large number of luminescent particles.Due to interparticle interactions,these measurements cannot accurately represent the emission behavior of individual crystal particles,making it even more challenging to uncover the fundamental photophysical mechanisms at the single-particle level.Therefore,exploring the luminescent properties of single lanthanide-doped upconversion crystal is crucial for the development of new materials and the optimization of their performance.In this work,we fabricateβ-NaYF_(4):20%Yb^(3+)/x%Er^(3+)/0.2%Tm^(3+)(x=0.2,0.4,0.6,0.8,1.0)microcrystals the uniform morphology and size,featuring a natural hexagonal cross-section and wedge-shaped on both top vertexes.The microcrystals have an average length approximately 40.2μm.Based on a selt-built confocal microscopy system,the upconversion luminescence per

关 键 词：稀土 上转换 白光发射 单颗粒 偏振 

分 类 号：O482.31[理学—固体物理]