Abstract
The Ho3+/Pr3+ co-doped NaYF4 single crystals with various Pr3+ concentrations and constant Ho3+ molar percentage of ~1% were grown by an improved Bridgman method. Compared with the Ho3+ single-doped NaYF4 crystal, an obviously enhanced emission band at 2.85 μm is observed under 640 nm excitation. The Judd-Ofelt strength parameters (Ω2, Ω4 and Ω6) are calculated, the radiative transition probabilities (A), the fluorescence branching ratios (β) and the radiative lifetime (τrad) are obtained in the meantime. The energy transfer from Pr3+ to Ho3+ and the optimum fluorescence emission of Ho3+ ions around 2.85 μm are investigated. Moreover, the maximum emission cross section of above samples at 2.85 μm is calculated to be 0.72×10-20 cm2 for the NaYF4 single crystal with Ho3+ molar percentage of 1% and Pr3+ molar percentage of 0.5% according to the measured absorption spectrum. All results suggest that the Ho3+/Pr3+ co-doped NaYF4 single crystal may have potential applications in mid-infrared lasers.
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