The Ho³⁺/Pr³⁺ co-doped Na YF4 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 Na YF4 crystal,an obviously enhanced emission band at 2.85 μm is observed under 640 nm excitation.The Judd-Ofelt strength parameters(?2,?4 and ?6) are calculated,the radiative transition probabilities(A),the fluorescence branching ratio...

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