報告題目：Huge enhancement in upconversion luminescence near-infrared emission of KYb (MoO₄)₂: Er³⁺ phosphor by doping Y³⁺ ions

報告時間：2024年06月14日 中午 12:30

報告地點：6D411

報 告 人：胡俊山
主辦單位：理學(xué)院

報告人簡介：

胡俊山，理學(xué)博士，2022年6月畢業(yè)于電子科技大學(xué)物理學(xué)專業(yè)；新加坡國立大學(xué)理學(xué)院，聯(lián)合培養(yǎng)博士。研究方向主要包括稀土摻雜光致發(fā)光納米材料、熒光粉、先進(jìn)功能納米材料和光電器件及其應(yīng)用。發(fā)表SCI學(xué)術(shù)論文近50篇，以第一作者身份發(fā)表SCI學(xué)術(shù)論文10余篇；已授權(quán)國家發(fā)明專利五項；主持四川省自然科學(xué)基金面上項目一項，參與國家自然基金二項和四川省自然科學(xué)基金一項。

內(nèi)容簡介：

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, ⁴I_9/2→⁴I_15/2) 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 (²H_11/2, ⁴S_3/2) to red light level (⁴F_9/2) 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.