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Tb3+/Yb3+ codoped $\alpha $ -NaYF4 single crystals with various Yb3+ concentrations and $\sim 0.40$ mol% Tb3+ are grown by Bridgman method using KF (Potassium fluoride) as flux with a temperature gradient of 70 °C/cm–90 °C/cm across the solid-liquid interface. The effect and mechanisms of KF in the growing process are studied. The crystal structure is characterized by means of XRD. The high transmission...
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