Abstract
Er3 +/ Yb3 +codoped NaYF 4 microcrystals were prepared via a facile hydrothermal approach assisted with oleic acid. The cubic-to-hexagonal phase transition and enhancement of up-conversion luminescence of Er3 +ions were simultaneously achieved by the gradual addition of Zr4 +ions in the reaction system. X-ray diffraction and SEM results indicated that the introduction of Zr4 +ions could remarkably accelerate the cubic-to-hexagonal phase transition process and pure hexagonal NaYF 4 microcrystals were obtained,when Zr4 +mole fraction reached 5%. Strong green and red upconversion luminescence of Er3 +ions was observed and the up-conversion intensity increased gradually with the addition of Zr4 +ions.
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