Cr离子掺杂超宽带近红外发光材料的设计方法  

Progress on design methods of Cr-doped ultra-broadband near-infrared luminescent materials

作　　者：尚蒙蒙 孙艺昕 SHANG Mengmeng;SUN Yixin(College of Materials Science and Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《中国粉体技术》2024年第5期91-101,共11页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:12374376。

摘　　要：【目的】Cr离子掺杂近红外(near-infrared,NIR)荧光材料在食品安全、医疗诊断、现代农业与环境保护等各领域广泛应用,获得研究人员的大量关注。NIR荧光材料的发射带宽对近红外光谱技术检测分析的灵敏度和检测范围至关重要,为获得Cr离子激活的超宽带NIR荧光材料,分析Cr离子的价态和晶格格位占据,理解发光构效关系,对实现新型Cr离子激活的超宽带NIR荧光材料具有重要意义。【研究现状】综述NIR荧光材料中Cr离子的常见价态,总结Cr离子掺杂超宽带NIR荧光材料的设计方法,概括不同方法制备材料的发光机制,对比不同近红外荧光材料设计方法的优缺点。【结论与展望】认为选取弱晶体场环境基质材料,进行晶格位点调控是获得高效Cr离子掺杂超宽带近红外发光材料的有效方法。Significance In recent years,near-infrared(NIR)fluorescent materials have gained significant attention due to their wide applications in food safety,medical diagnosis,modern agriculture,and environmental protection.The emission bandwidth of NIR fluorescent materials is crucial for the sensitivity and detection range of NIR spectroscopy.Novel NIR fluorescent materials activated by rare earth ions(Nd^(3+)、Dy^(3+)、Er^(3+)、Yb^(3+))or transition metal ions(Cr^(3+)、Ni^(2+)、Mn^(2+)/^(4+),and Fe^(3+))have been widely reported.However,trivalent rare earth ions have narrow emission bandwidths and low absorption efficiency.Although transition metal ions with d-d transitions exhibit a wider emission range,their emission half-peak width and excitation-emission wavelength mismatch in the NIR range are suboptimal.Cr ions are ideal NIR luminescence centers with broad absorption in the UV-visible spectrum.Understanding the valence states and lattice sites of Cr ions is essential for developing high-performance Cr ion-activated ultra-broadband NIR fluorescent materials,which are significant for NIR spectroscopy applications.Progress This review discusses the two common valence states(+3 and+4)and three luminescent centers of Cr ions in NIR fluorescent materials:hexacoordinated Cr^(3+),tetracoordinated Cr^(3+),and tetracoordinated Cr^(4+).Hexacoordinated Cr^(3+)occupies octahedral lattice sites,and its luminescence varies with crystal field strength,displaying either sharp peaks or broad emissions.In spinel compounds,elements such as Mg and Al influence site occupancy,causing Cr^(3+)ions to occupy tetrahedral lattice sites,resulting in emission peaks that tend to appear at relatively longer wavelengths.Cr^(4+)typically emits in the 1000~1400 nm range,with peak wavelengths exceeding 1200 nm.The review summarizes two design methods for Cr ion-doped ultrabroadband NIR fluorescent materials:co-doping Cr^(3+)with other ions such as rare earth(RE^(3+))and transition(Ni^(2+))ions,and selecting matrix materials with different cat

关 键 词：Cr离子掺杂 近红外发光 发光机制 

分 类 号：O611.3[理学—无机化学] TB4[理学—化学]