White light emission from Tm3+/Dy3+ co-doped oxyfluoride germanate glasses under UV light excitation
White light emission from Tm3+/Dy3+ co-doped oxyfluoride germanate glasses under UV light excitation
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DOI：
10.1016/j.jssc.2008.11.020
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发表时间：
2009-04
影响因子：
3.3
通讯作者：
G. Lakshminarayana;Hucheng Yang;J. Qiu
中科院分区：
文献类型：
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作者：
G. Lakshminarayana;Hucheng Yang;J. Qiu
本文报道了Tm~(3+)/Dy~(3+)共掺氟氧锗酸盐白光玻璃的吸收和发光特性。用X射线衍射仪(XRD)和差热分析(DTA)对基质玻璃的结构和热稳定性进行了表征。根据测量的吸收光谱，估算了Tm~(3+)和Dy~(3+)离子的J-O强度参数(Ω_2、Ω_4和Ω_6)。在这些眼镜中出现了蓝色、黄色和红色的组合发射，这使得当眼镜被紫外线激发时，可以观察到明亮的白光。通过改变激发波长可以改变白光的发光颜色。此外，通过调节共掺杂玻璃中Tm3+或Dy3+离子的浓度，可以很容易地调节包括白光在内的各种颜色的发光。研究了Dy~(3+)、→、Tm~(3+)离子的浓度猝灭效应，解释了Dy~(3+)、Tm~(3+)离子可能的能量传递机制，并通过衰变寿命测量证实了这一点。
In this paper, we report on the absorption and photoluminescence properties of Tm3+/Dy3+ions co-doped oxyfluoride germanate glasses for white light emission. The X-ray diffraction (XRD) and differential thermal analysis (DTA) profiles of the host glass have been carried out to confirm its structure and thermal stability. From the measured absorption spectra, Judd–Ofelt (J–O) intensity parameters (Ω2, Ω4and Ω6) have been evaluated for Tm3+and Dy3+ions. A combination of blue, yellow and red emissions has emerged in these glasses, which allows the observation of bright white light when the glasses are excited by the ultraviolet light. The white light luminescence colour could be changed by varying the excitation wavelength. Also, various colours of luminescence, including white light, can be easily tuned by adjusting the concentrations of Tm3+or Dy3+ions in the co-doped glasses. Concentration quenching effect was also investigated and possible energy transfer mechanism from Dy3+→Tm3+ions was explained which is also confirmed by the decay lifetime measurements.