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用水热法制备了(La_(1-x),Gd_x)PO_4∶Pr~(3+)荧光材料。用X射线粉末衍射(XRD)确定该荧光材料为单斜晶系,用荧光光谱探究了Pr~(3+)浓度及Gd~(3+)掺杂量对上转换发光效果的影响。结果表明,随着Pr~(3+)浓度的增加发光强度先增强后减弱,Pr~(3+)浓度为0.9%时,发光强度最大,达到2400cd。且掺杂适量的Gd~(3+)使发光效果增强,当Gd~(3+)掺杂量为50%(wt,质量分数)时,上转换发光性能最好,达到3600cd。在828nm近红外光激发下,可以观察到Pr~(3+)590nm处的橙黄光发射峰,来自于Pr~(3+)的~3P1→~3H_6跃迁;以及在476nm和491nm处的蓝光发射峰(Pr~(3+)的~3P_0→~3H_4和~3P_1→~3H_4的跃迁产生)。
(La_ (1-x), Gd_x) PO_4: Pr_ (3+) fluorescent materials were prepared by hydrothermal method. The fluorescent material was determined to be monoclinic by X-ray powder diffraction (XRD). Fluorescence spectra were used to investigate the effect of Pr 3+ concentration and Gd 3+ doping on upconversion luminescence. The results showed that the luminescence intensities first increased and then decreased with the increase of Pr 3+ concentration, and reached the maximum at 2400 cd when the concentration of Pr 3+ was 0.9%. When the amount of Gd 3+ doping is 50% (wt, mass fraction), the up-conversion luminescence properties are the best, reaching 3600cd. Under the excitation of 828nm near-infrared light, the orange-yellow light emission peak at 590nm of Pr ~ (3+) is observed, which is from ~ 3P1 → ~ 3H_6 transition of Pr ~ (3+); and the blue emission at 476nm and 491nm (Pr ~ (3+) ~ 3P_0 → ~ 3H_4 and ~ 3P_1 → ~ 3H_4 transitions).