报告题目：Huge enhancement in upconversion luminescence near-infrared emission of KYb (MoO4)2: Er3+ phosphor by doping Y3+ ions
报告时间：2024年06月14日 中午 12:30
报告地点：6D411
报 告 人：胡俊山
主办单位：天博全站app网页版
报告人简介：
胡俊山，理学博士，2022年6月毕业于电子科技大学物理学专业；新加坡国立大学天博全站app网页版，联合培养博士。研究方向主要包括稀土掺杂光致发光纳米材料、荧光粉、先进功能纳米材料和光电器件及其应用。发表SCI学术论文近50篇，以第一作者身份发表SCI学术论文10余篇；已授权国家发明专利五项；主持四川省自然科学基金面上项目一项，参与国家自然基金二项和四川省自然科学基金一项。
内容简介：
A series of KYb(MoO4)2: 0.1 % Er3+ self-activated phosphors with different x % Y3+ doping concentrations (x = 1, 2, 5, 7.5, 10) were synthesized by high temperature solid state reaction method. By further doping Y3+ ions, the near-infrared (804 nm, 4I9/2→4I15/2) luminescence of KYb(MoO4)2: 0.1 % Er3+ phosphor is greatly enhanced. Based on the upconversion luminescence (UCL) spectra, the optimal doping concentration of Y3+ ions were 7.5 %. Its luminescence intensity is about 26.9 times that of undoped Y3+ ions. Through a series of characterization methods, we find that the enhancement of NIR upconversion emission is due to the generation of defect bands. It plays a crucial role in facilitating the transfer of energy from green light level (2H11/2, 4S3/2) to red light level (4F9/2) and near-infrared level. To explain its luminescence mechanism, the power dependence, UV-VI-NIR absorption spectra, excitation spectra at 804 nm and emission spectra at 380 nm were studied. In addition, the single near-infrared UCL intensity of KYb (MoO4)2: 0.1 % Er3+, 7.5 % Y3+ at 804 nm shows a linear variation with temperature in the temperature range of 298 K - 673 K. The maximum sensitivity is 0.13 % K-1. This study provides a new method and theoretical support for the application of near-infrared UCL in optical temperature measurement.