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Nd3+-Sensitized Multicolor Upconversion Luminescence from A Sandwiched Core/Shell/Shell Nanostructure


Recently, lanthanide-doped upconversion nanoparticles (UCNPs) have attracted a lot of interest for bioimaging, biosensing, and therapeutic applications. These motivations are empowered by multicolor upconversion luminescence (UCL) under single near infrared wavelength exciation at ~ 980 nm. However, this wavelength overlaps with the absorption peak of water that is dominant in biological environment, eliciting serious biological heating problem. Here, we report on tailored multicolor UCL from a Nd3+-sensitized sandwich-structure of core/shell/shell UCNPs of NaYbF4:0.5%Tm,1%Nd@ CaF2:30%Nd@CaF2:1%Nd,20%Yb,2%Er that can be excited at single-wavelength of ~ 800 nm without producing any local heating. Incorporation of substantial Nd3+ sensitizers in the middle shell region allows efficient harvesting of excitation light, with the excitation then migrating bidirectionally across the core/shell interfaces to simultaneously actvate blue emission from Tm in the core as well as green and red emission from Er in the outermost shell layer. By precise control of the content of lanthanide ions in each domain, a palette of multicolor UCL can be produced, ranging from blue to white. The described Nd3+-sensitized multicolor UCNPs hold promises for a variety of multiplexed biological applications, without complication from heating effect.

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Publication details

The article was received on 11 Apr 2017, accepted on 13 Jun 2017 and first published on 14 Jun 2017

Article type: Paper
DOI: 10.1039/C7NR02594G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Nd3+-Sensitized Multicolor Upconversion Luminescence from A Sandwiched Core/Shell/Shell Nanostructure

    S. Hao, G. Chen, C. Yang, W. Shao, W. Wei, Y. Liu and P. N. Prasad, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02594G

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