Abstract
AbstractWe report the synthesis and characterization of cubic NaGdF4:Yb/Tm@NaGdF4:Mn core–shell structures. By taking advantage of energy transfer through Yb→Tm→Gd→Mn in these core–shell nanoparticles, we have realized upconversion emission of Mn2+ at room temperature in lanthanide tetrafluoride based host lattices. The upconverted Mn2+emission, enabled by trapping the excitation energy through a Gd3+ lattice, was validated by the observation of a decreased lifetime from 941 to 532 μs in the emission of Gd3+ at 310 nm (6P7/2→8S7/2). This multiphoton upconversion process can be further enhanced under pulsed laser excitation at high power densities. Both experimental and theoretical studies provide evidence for Mn2+ doping in the lanthanide‐based host lattice arising from the formation of F− vacancies around Mn2+ ions to maintain charge neutrality in the shell layer.
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