Er^(3+)掺杂含Ba_2LaF_7纳米晶氧氟硼硅酸盐玻璃陶瓷发光性能的研究(英文)

Luminescence Behavior of Er^(3+) in Oxyfluoride Borosilicate Glass Ceramics Containing Ba_2LaF_7 Nanocrystals

制备了含有Ba2LaF7纳米晶的Er3+掺杂氧氟硼硅盐玻璃陶瓷,并对其光谱特性进行了研究.根据X射线粉末衍射结果可确认制备出Ba2LaF7纳米晶.根据吸收曲线计算了相应的Judd-Ofelt参数,Ω2随着热处理温度的升高而减小,证明Er3+离子进入到Ba2LaF7纳米晶中.由于Ba2LaF7纳米晶的低声子能量,在玻璃陶瓷中观察到强烈的红光和绿光上转换发光,其上转换发光机理可以归为双光子过程.

Spectroscopic properties of Er^3＋ doped transparent oxyfluoride borosilicate glass ceramics containing Ba2LaF7 nanocrystals are systematically investigated. The formation of Ba2LaF7nanocrystals in the glass ceramics was confirmed by X-ray diffraction. According to the Judd-Ofelt theory, the intensity parameters Ωi （i = 2,4,6） is calculated and the decrease of Ω2 suggests that rare earth ions are incorporated into Ba2LaF7 nanocrystals. Compared with the precursor glass, significantly increased upconversion luminescence is observed in the transparent glass ceramics. This is attributed to the low phonon energy of fluoride nanocrystals, when Er^3＋ is incorporated into the precipitated Ba2LaF7 nanocrystals. And the emission mechanism can be described as a two-photon mechanism.