【作者】 谢木标； 梁宏斌； 苏锵；

【Author】 Mubiao Xie Hongbin Liang~* Qiang Su (School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275,People’s Republic of China)

【机构】 中山大学化学与化学工程学院；

【摘要】 采用高温周相反应方法合成了二价稀土离子Eu²⁺掺杂Li₂BaSiO₄基质荧光粉Li₂Ba_1-xEu_xSiO₄,测定了它们的紫外激发发射光谱、阴极射线发光以及荧光寿命等性质。结果表明:Li₂Ba_1-xEu_xSiO₄荧光粉在250-450nm波段有很强的吸收,最强吸收位于357nm,发射光谱为主峰位置大约位于501nm的典型Eu²⁺离子的4f⁶5d¹→4f⁷跃迁宽带特征发射,猝灭浓度约为0.9mol%。低压阴极射线激发的发射光谱显示样品Li₂Ba_0.991Eu_0.009SiO₄为较强的绿光发射,并且有较高的饱和电流,说明在样品在场发射显示（FEDs）上可能有潜在的应用。此外,荧光衰减曲线表明,荧光寿命大约为600 ns,符合Eu²⁺离子的4f⁶5d¹→4f⁷跃迁的荧光衰减特征。更多还原

【Abstract】 Eu²⁺-activated phosphors Li₂Ba_1-xEu_xSiO₄ were prepared using a solid-state reaction technique at high temperature,and the properties of photoluminescence（PL ） excitation and emission spectra, cathodoluminescence（CL） and luminescence lifetime were studied.The results show that phosphors Li₂Ba_1-xEu_xSiO₄ have intense absorption in the wavelength range between 250-450 nm.The emission spectra exhibit a broad band with a maximum at -501 nm,which was attributed to the typical 4f⁶5d¹→4f⁷ transition of Eu²⁺.The optimum luminescent concentration is about 0.9 mol%.Emission spectra under low voltage cathode-ray excitation reveal that sample Li₂Ba_0.991Eu_0.009SiO₄ show intense green emission and high saturation current,indicating that the phosphor may have potential application for field emission displays（FEDs）. Furthermore,the luminescence decay curves indicate that luminescence lifetime of these phosphors is about 600 ns,which is agree with the luminescence properties of Eu²⁺ 4f⁶5d¹→4f⁷ transitions.更多还原