Hydrothermal synthesis and upconversion luminescent properties of Sr2LaF7 doped with Yb3+ and Er3+ nanophosphors

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R. D. Shannon · Acta Crystallographica Section A · 1976 · 64.8K citations

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Solid State Infrared Quantum Counters

N. Bloembergen · Physical Review Letters · 1959 · 644 citations

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Upconversion processes in coupled ion systems

F. Auzel · Journal of Luminescence · 1990 · 372 citations

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