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A series of NaBiF4:Er3+/Yb3+ micro-/nanocrystals were synthesized via the low-temperature molten-salt method in NH4NO3 flux. The influences of the amount of NaF and NH4NO3 flux used, the reaction time and reaction temperature on the crystal phase structure, morphology and size of the resultant samples were systematically investigated. The morphology, size, doped concentrations of Er3+ and Yb3+, pumping power, and temperature dependences of UC emissions were studied in detail under 980 nm irradiation. The NaBiF4:3 mol% Er3+/20 mol% Yb3+ crystal exhibits the strongest green UC emission, which was observed under several mW 980 nm excitation at room temperature. The energy transfer between Bi3+ and Er3+ during UC emission process was also discussed at length.

Low-temperature molten-salt synthesis and upconversion of novel hexagonal NaBiF4:Er3+/Yb3+ micro-/nanocrystals

Low-temperature molten-salt synthesis and upconversion of novel hexagonal NaBiF₄:Er³⁺/Yb³⁺ micro-/nanocrystals