Abstract
It is of great significance to enhance the quantum-cutting (QC) luminescence for practical applications due to the narrow absorption cross-section and low luminescence efficiency of rare earth ions. In this work, NaBaPO4:Er3+ phosphors doped with Li+ were synthesized through a solid-state reaction. The QC luminescence of NaBaPO4:Er3+ phosphor was enhanced 5.71 times by doping Li+. XRD patterns and Judd-Ofelt calculations demonstrated the crystal field distortion when introduced Li+, which would increase the transition probability of Er3+. Furthermore, NaBaPO4:Er3+, Li+ phosphors were decorated with silver nanoparticles (Ag NPs). The effect of Ag NPs on QC luminescence was studied, and the results showed that QC luminescence was further enhanced up to 1.95 times by Ag NPs. FDTD simulations revealed that Ag NPs generated substantial surface plasmons, which would boost the excitation rate of Er3+. Our studies would provide a useful strategy to enhance QC luminescence, which has potential application in germanium-based solar cells.
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