School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China.
Dalton Trans. 2013 Sep 28;42(36):12989-97. doi: 10.1039/c3dt51470f. Epub 2013 Jul 19.
Ce(3+) and Ce(3+)/Tb(3+)-activated Y4Si2O7N2 phosphors are synthesized by the solid-state method, which can be efficiently excited by near ultraviolet (UV) light emitting diode (LED) chips. The PL spectrum of Y4Si2O7N2:Ce(3+) shows a broad hump between 380 and 650 nm, assigned to the electron transition from the 4f energy level to different 5d sub levels of the Ce(3+) ions at different Y(3+) sites. The color of the Y4Si2O7N2:Ce(3+) phosphor can shift from blue to green by introducing Tb(3+). In addition, the energy transfer process from Ce(3+) to Tb(3+) in the Y4Si2O7N2 host was investigated and discussed in terms of both the luminescence spectra and decay curves. The energy transfer critical distance has been calculated and evaluated by the concentration quenching method. Therefore, the Ce(3+) and Ce(3+)/Tb(3+)-activated Y4Si2O7N2 phosphors can serve as key materials for phosphor-converted white-light UV-LEDs.
采用高温固相法合成了 Ce(3+)和 Ce(3+)/Tb(3+)激活的 Y4Si2O7N2 荧光粉，它们可以被近紫外（UV）发光二极管（LED）芯片有效激发。Y4Si2O7N2:Ce(3+)的光致发光（PL）光谱在 380nm 到 650nm 之间呈现出一个宽的峰，归因于 Ce(3+)离子在不同 Y(3+)位上的 4f 能级到不同 5d 子能级的电子跃迁。通过引入 Tb(3+)，Y4Si2O7N2:Ce(3+)荧光粉的颜色可以从蓝色调变为绿色调。此外，还从发光光谱和衰减曲线两方面研究并讨论了 Y4Si2O7N2 基质中 Ce(3+)到 Tb(3+)的能量传递过程。通过浓度猝灭法计算并评估了能量传递的临界距离。因此，Ce(3+)和 Ce(3+)/Tb(3+)激活的 Y4Si2O7N2 荧光粉可以作为磷光转换型白光 UV-LED 的关键材料。
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