Er3+/Tm3+共掺杂Ga5Ge20Sb10S65玻璃的发光特性及能量传递

采用高温熔融急冷法制备了系列Er3+/Tm3+共掺杂的Ga5Ge20Sb10S65玻璃,测试了样品的吸收光谱,以及分别在980 nm和800nm LD激发下样品的荧光光谱.运用Judd-Ofelt理论计算了Er3+离子在Ga5Ge20Sb1oS65玻璃中的强度参数Ω(i=2,4,6)、自发辐射跃迁几率A和辐射寿命τ等光...

Luminescence and Mechanism of Energy Transfer of Er_(3+)/Tm_(3+)-codoped Ga_5Ge_(20)Sb_(10)S_(65) Glass

Er³⁺ /Tm³⁺-codoped Ga₅Ge₂₀Sb₁₀S₆₅ glasses were prepared by traditional melt-quenching method. Fluorescence spectra were investigated under 980 nm and 800 nm LD excitation. Combined with their absorption spectra, the Judd-Ofelt intensity parameters Ω_i (i=2,4,6), spontaneous transition probabilities A and rediative lifetomes τ for Er³⁺ ion were calculated by Judd-Ofelt theory. Due to the energy transfer from ⁴I_13/2 of Er³⁺ to ³F₄ of Tm³⁺ , the addition of Tm³⁺ significantly reduced the lifetime of the ⁴I_13/2 level of Er³⁺ , that in turn increase the possibility of population inversion between the ⁴I_11/2 and ⁴I_13/2 levels of Er³⁺. It is learned that the intensity of 2.76 μm mid-infrared fluorescence firstly increased, and then dropped in the Er³⁺ /Tm³⁺-doped Ga₅Ge₂₀Sb₁₀S₆₅ glasses with the increase of Tm³⁺ ion concentration.