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采用凝胶溶胶法制备了不同浓度的Y2O3:Ho3+/Yb3+/Li+纳米晶,并且系统研究了不同掺杂浓度对上转化荧光现象的影响。首先,通过XRD图形判断了晶体结构的生成,再通过980 nm的激光器和荧光光谱仪测得的光谱图,发现了位于520~579 nm的绿光、635~674 nm的红光等两条很强的可见光,还有一条较弱的位于743~775 nm的近红外发光。最后,通过与能级图比较和分析可以得出:它们分别是5F4/5S2→5I8,5F5→5I8和5F4/5S2→5I7荧光跃迁。可以看出:在掺杂入Li+之后,上转化荧光得到了极大增强。
Different concentrations of Y2O3: Ho3 + / Yb3 + / Li + nanocrystals were prepared by the sol-gel method. The effects of different doping concentrations on the up-conversion fluorescence were studied systematically. First, the crystal structure was determined by XRD pattern, and then the spectrum measured by a 980 nm laser and fluorescence spectrometer showed that the two structures are very green at 520-579 nm and red at 635-674 nm Of visible light, and a weaker near-infrared light at 743 ~ 775 nm. Finally, by comparing with the energy level graph, we can see that they are 5F4 / 5S2 → 5I8, 5F5 → 5I8 and 5F4 / 5S2 → 5I7 fluorescence transition respectively. It can be seen that after the incorporation of Li +, the up-conversion fluorescence has been greatly enhanced.