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The white upconversion luminescence (UCL) of upconversion nanoparticles (UCNPs) is mainly made up of the color red, green and blue. Interestingly, the white-light-emitting UCNPs can be obtained via a complex method of tridoping lanthanide ions such as Yb3+, Er3+, and Tm3+. We herein report that an excellent white UCL can be obtained from Yb/Tm double-doped ZnO. In this system, the blue and red UCL-emissions...
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