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Nd3+‐sensitized quenching‐shield sandwich‐structured upconversion nanoparticles are reported, which exhibit highly efficient upconversion photoluminescence under excitation by an 800 nm continuous‐wave laser. The transition‐layer structure is essential to bridge energy transfer from the sensitizer to the activator and simultaneously block energy back‐transfer from the activator to the sensitizer....
Nd3+‐sensitized quenching‐shield sandwich structure upconversion nanoparticles are designed by J. Yao, Y. Ma, Y. Zhao, and co‐workers on page 2831. The transition layer in this unique structure is essential to eliminate the photon‐quenching effect caused by Nd3+‐doping, and simultaneously bridge the energy transfer from the sensitizer to the activator. Therefore the Nd3+ concentration can reach up...
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