Enhanced emission at 2.85 μm of Ho3+/Pr3+ co-doped α-NaYF4 single crystal

Cheng Wang; Hai-ping Xia; Zhi-gang Feng; Zhi-xiong Zhang; Dong-sheng Jiang; Jian Zhang; Qi-guo Sheng; Qing-yang Tang; Shi-nan He; Hao-chuan Jiang; Bao-jiu Chen

doi:10.1007/s11801-016-5221-4

Optoelectronics Letters ›› , Vol. 12 ›› Issue (1) : 56-60. DOI: 10.1007/s11801-016-5221-4

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Enhanced emission at 2.85 μm of Ho³⁺/Pr³⁺ co-doped α-NaYF₄ single crystal

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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 (τ_rad) 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.

Keywords

Molar Percentage / Emission Cross Section / Energy Level Structure / Radiative Transition Probability / Gain Cross Section

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Cheng Wang, Hai-ping Xia, Zhi-gang Feng, Zhi-xiong Zhang, Dong-sheng Jiang, Jian Zhang, Qi-guo Sheng, Qing-yang Tang, Shi-nan He, Hao-chuan Jiang, Bao-jiu Chen. Enhanced emission at 2.85 μm of Ho³⁺/Pr³⁺ co-doped α-NaYF₄ single crystal. Optoelectronics Letters, , 12(1): 56‒60 https://doi.org/10.1007/s11801-016-5221-4

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This work has been supported by the National Natural Science Foundation of China (No.51272109), the Natural Science Foundation of Ningbo City (No.201401A6105016), and the K. C. Wong Magna Fund in Ningbo University.