A mini-review on recent progress of new sensitizers for luminescence of lanthanide doped nanomaterials

查看全文 作　　者：Hongxin [1]Zhang;Zi-Han [1]Chen;Xuan [1]Liu;Fan [1]Zhang

机构地区：[1]Department of Chemistry,Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,State Key Laboratory of Molecular Engineering of Polymers and iChem,Fudan University,Shanghai 200433,China

出　　处：《Nano Research》索引2020年第13卷第7期,共15页

基　　金：the National Key R&D program of China(No.2017YFA0207303);the National Natural Science Foundation of China(Nos.21725502 and 21701027);Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(No.17JC1400100). 摘　　要：Trivalent lanthanide(Ln2+)doped luminescent nanocrystals are promising for applications ranging from biosensor,lasing,super-resolution nanoscopy,information security and so on.Although the utility prospect is of great attractions,the light absorption of these lanthanide doped nanocrystals is inherently weak due to the electric dipole-forbidden 4f→4f transitions.Even worse,the quantum yields of upconverison nanocrystals are very low,which will unavoidably hinder their further applications.In a typical lanthanide luminescent nanosystem,both sensitizers as light absorption centers and activators as light emitting centers are necessary and important for desired luminescence properties.Among various sensitization systems,only Yb3+and Nd+are considered as the most efficient sensitizers.Thus,the corresponding excitation wavelengths are strictly limited around 980 and 808 nm.To enrich excitation wavelengths and boost luminescence intensity,exploring more sensitization units that possess larger absorption cross section,higher efficiency of energy transfer process and independent excitation is imperative and beneficial for the demands of different applications,such as broadened absorption in near infrared(NIR)region for higher conversion efficiency of solar cells,prolonged excitation wavelength to second near infrared windows region(NIR Ⅱ,1,000-1,700 nm)for in vivo fluorescence imaging with deeper tissue depth and higher spatial resolution,more orthogonal excitations and emissions to improve optical multiplexing,and so on.Therefore,in the review,we primarily conclude several major energy transfer mechanisms from sensitizers to activators.Then we present three kinds of sensitizers,including lanthanide ions,organic dyes and quantum dots(QDs),and introduce the newly designed sensitization system that allows us to exploit superior excitation wavelength and amplity luminescence intensity.Finally,several future challenges and opportunities for the sensitizing strategies are discussed in hope of directing and broadening the applications of lanthanide nanosystem. 关键词：lanthanide luminescenee new sensitizers organic dyes quantum dots

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A mini-review on recent progress of new sensitizers for luminescence of lanthanide doped nanomaterials

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