近红外二区荧光粉Y2GeO5: Cr4+制备与发光性质
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关键词：近红外二区荧光粉；宽带发射； Cr4+ 掺杂；无损检测中图分类号：0482.31 文献标识码：ADOI：10.37188/CJL.20250159 CSTR：32170.14.CJL.20250159
Abstract：Due tothe widespreadapplicationsof near-infrared（NIR）light inmedical diagnosis，food inspection，andbiological detection，thedemandforbroadband long-wavelength fluorescent powdersin theNIR-I region hasbecome increasingly urgent.In this work，a seriesof Y2GeO5：Cr4+ （YG ：Cr4+ ）broadband NIR-Ⅱ phosphors were successfully synthesized via a high-temperature solid-state method.At the optimal Cr doping concentration，the synthesized YG ÷0 .7%Cr4+ NIR- II phosphor exhibited broadband NIR- II emission peaking at1330nm under 469 nmbluelightexcitation，demonstrating an emissionbandwidthof267nminfull-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 fromthe spin-allowed 3T2⟶3A2 transition of Cr4+ ions occupying Ge4+ lattice sites. Additionally，the prepared YG：0. 7%Cr4+ （20 NIR-I phosphor was successfully employed for qualitative detection of water，ethanol，and sunflower seed oil， as well as freshnessassessment of pear slices. These demonstrations highlight the material's promising potential in non-destructive testing applications.
Keywords：near-infrared II phosphor;broadband emission; Cr4+ doping；non-destructive testing
1引言
近红外（Nearinfrared，NIR）光谱技术由于无损、实时及深层穿透特性，在食品检测、生物成像等领域展现出重要应用前景[1-3]。（剩余15550字）
