摘要
随着近红外(NIR)光在医学诊断、食品检验和生物检测等领域的广泛应用,对宽带长波长NIR-Ⅱ区荧光粉的需求日益迫切。本文通过高温固相法成功合成了一系列Y_(2)GeO_(5):Cr^(4+)(YG:Cr^(4+))宽带NIR-Ⅱ区荧光粉。在最佳掺杂铬浓度下,所合成的YG:0.7%Cr^(4+)NIR-Ⅱ区荧光粉在蓝光469 nm激发下呈现主峰位于1330 nm的宽带NIR-Ⅱ区发射,其发射峰半高宽为267 nm。晶体结构和光谱分析以及低温发射/激发光谱证实,宽带NIR-Ⅱ区发射源于Cr^(4+)占据Ge^(4+)位点产生的3T2→3A2自旋允许跃迁。此外,利用制备的YG:0.7%Cr^(4+)NIR-Ⅱ区荧光粉实现了对水、乙醇、葵花籽油的定性检测以及对梨片新鲜度的检测,证实了该荧光粉在无损检测方面具有潜在的应用前景。
Due to the widespread applications of near-infrared(NIR)light in medical diagnosis,food inspection,and biological detection,the demand for broadband long-wavelength fluorescent powders in the NIR-I region has become increasingly urgent.In this work,a series of Y_(2)GeO_(5):Cr^(4+)(YG:Cr^(4+))broadband NIR-I phosphors were successfully synthesized via a high-temperature solid-state method.At the optimal Cr doping concentration,the synthesized YG:0.7%Cr^(4+)NIR-Ⅱphosphor exhibited broadband NIR-Ⅱemission peaking at 1330 nm under 469 nm blue light excitation,demonstrating an emission bandwidth of 267 nm in full-width-athalf-maximum(FWHM).Crystal structure analysis and spectroscopic characterization,combined with low-temperature emission/excitation spectra,confirmed that the broadband NIR-I emission originates from the spin-allowed 3T2→3A2 transition of Cr^(4+)ions occupying Ge^(4+)lattice sites.Additionally,the prepared YG:O.7%Cr 4+NIR-Ⅱphosphor was successfully employed for qualitative detection of water,ethanol,and sunflower seed oil,as well as freshness assessment of pear slices.These demonstrations highlight the material's promising potential in non-destructive testing applications.
作者
杜晨
张志忠
魏同成
戴鹏鹏
DU Chen;ZHANG Zhizhong;WEI Tongcheng;DAI Pengpeng(School of Physics and Electronic Engineering,Xinjiang Normal University,Urumqi 830054,China)
出处
《发光学报》
北大核心
2025年第11期2087-2095,共9页
Chinese Journal of Luminescence
基金
国家自然科学基金(52262029)
新疆维吾尔自治区自然科学基金(2022TSYCCX0016)
新疆师范大学青年科技创新人才项目(XJNUQB2022-15)
新疆维吾尔自治区自然科学青年基金(2024D01B60)。
