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Excitation energy mediated cross-relaxation for tunable upconversion luminescence from a single lanthanide ion - Nature Communications
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Precise control of energy migration between sensitizer ions and activator ions in lanthanide-doped upconversion nanoparticles (UCNPs) nowadays has been extensively investigated to achieve efficient photon upconversion. However, these UCNPs generally emit blue, green or red light only under fixed excitation conditions.
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