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This paper reports on the spectral parameters of Er3+ in Er3+/Yb3+ : Ca3Y2(BO3)4, Er3+/Yb3+ : Ca3Gd2(BO3)4 and Er3+/Yb3+ : Ca3La2(BO3)4 crystals. The results show that the oscillator strength parameters Ωt, fluorescence quantum efficiency and emission cross-sections of Er3+/Yb3+ : Ca3Ln2(BO3)4 (Ln=Y, Gd, La) crystals are larger than those of Er3+ : Ca3Ln2(BO3)4 (Ln=Y, Gd, La) crystals, and the codoped Er3+/Yb3+ can enhance the optical transition probability of Er3+ in the crystals and improve the fluorescence quantum efficiency and emission cross section of the 4I 13/2→4I 15/2 transition of Er3+ in Er3+/Yb3+ : Ca3Ln2(BO3)4 (Ln=Y, Gd, La) crystals.
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Wei et al. (2007) studied this question.
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