采用高温固相法在1 300 ℃煅烧2小时制备了不同浓度Dy3+离子掺杂的YNbO4微晶粉末, 测量了样品的X射线衍射谱, 结果表明生成了纯相YNbO4微晶结构。采用漫反射积分球和光纤光谱仪测量了样品吸收谱, 并通过Judd-Ofelt理论计算了Dy3+掺杂YNbO4微晶粉末样品的光谱强度参数Ω2、Ω4、Ω6, 以及实验和理论振子强度。测量了监测波长为577 nm的样品激发谱, 结果表明在260 nm处有一个强激发峰, 其主要由YNbO4晶格吸收产生, 在其他波段还有几个较强激发峰, 主要归因于Dy3+离子的4f-4f跃迁。测量了270 nm和360 nm波长激发下的发射谱, 观察到了相似的发射峰分布。通过不同Dy3+掺杂浓度样品发射峰比较, 发现了浓度猝灭效应。根据能量传递理论分析表明, Dy3+离子的浓度猝灭属于电偶极-电偶极相互作用。最后, 计算了样品的CIE色坐标, 发现最接近于白光区域的色坐标为(0.219, 0.166)。

A novel Tm³⁺/Er³⁺/Yb³⁺ triply-doped glass ceramics containing BaF2 nano-crystals are successfully prepared. Fluoride nanocrystals BaF2 are successfully precipitated in glass matrix, which is affirmed by the X-ray diffraction results. The intense blue (476 nm), green (543 nm), and red (656 nm) emissions of the glass ceramics are simultaneously observed at room temperature under 980-nm excitation, and the emission luminescence intensity increases signiˉcantly compared with the precursor glass, which is attributed to the low phonon energy of °uoride nanocrystals when rare-earth ions are incorporated into the precipitated BaF2 nanocrystals. Under 980-nm excitation at 400 mW, the international commission on illumination (CIE) chromaticity coordinate (X = 0.278, Y = 0.358) of the tridoped oxy°uoride glass ceramics' upconversion emissions is close to the standard white-light illumination (X = 0.333, Y = 0.333). The results indicate that Tm³⁺/Er³⁺/Yb³⁺ triply doped glass ceramics can act as suitable materials for potential three-dimensional displays applications.