利用球磨法制备了Na源及其比例不同的Tm3+/Yb3+掺杂的NaGdF4发光粉, 并对部分样品高温处理。讨论了Na源及其比例的不同和高温对样品上转换发光的影响。结果表明在所选比例中, 当各离子的量比n(RE)∶n(Na)∶n(F)=1∶1∶4时, 样品在高温处理前后的上转换发光均为最强。高温处理改变了上转换荧光发射的比例, 可见光区的发射强度有大幅增加。 XRD测试结果表明, Tm3+和Yb3+掺入到了NaGdF4的晶格内, 高温处理改变了部分样品的结晶度和相态, 从而导致可见光的发射强度大幅增加。HRTEM图像显示样品中有α相与β相NaGdF4共存。对上转换发光和顺磁性质之间相互影响的研究结果表明, 980 nm红外激光的激发对样品的顺磁性基本没有影响, 而变化磁场的存在对上转换发光有负面的影响。

Tm3+/Yb3+ doped NaGdF4 luminescent powder with different Na sources and ion ratios were synthesized by ball milling method, and part of samples were treated under high temperature. In all selected molar ratios of the ions, n(RE)∶n(Na)∶n(F)=1∶1∶4 is the best. The up-conversion luminescence of the samples with this ratio is the strongest before and after high temperature treatment. After high temperature treatment, the intensity of visible light emission increases significantly. XRD results show that Tm3+ and Yb3+ have doped in the lattices of NaGdF4. After high temperature treatment, part of β-phase and amorphous phase turn to α-phase, which results in the crystallinity improving. HRTEM image also shows that α- and β-phase coexist in the sample. The excitation of 980 nm laser hardly has effect on the paramagnetism of the samples, but the changing magnetic field has negative effect on the up-conversion luminescence of the samples.