双钙钛矿型Ca_(2)Gd_(1-x)TaO_(6):xTb^(3+)绿色荧光粉的合成与荧光性质

Synthesis and Luminescence Properties of Double Perovskite Ca_(2)Gd_(1-x)TaO_(6):xTb^(3+) Green Phosphors

通过高温固相法合成了双钙钛矿型Ca_(2)Gd1-xTaO_(6):xTb^(3+)(CGTO:xTb^(3+))绿色荧光粉。采用X射线衍射、扫描电镜、荧光光谱、荧光衰减曲线、量子效率(η)测试分别表征了 CGTO:xTb^(3+)荧光粉的物相、形貌和荧光性质。在紫外光激发下,CGTO:xTb^(3+)荧光粉实现了较强的绿光发射,绿光为Tb^(3+)离子的5D4-7F5跃迁。通过变温发射光谱研究发现CGTO:0.15Tb^(3+)荧光粉的热猝灭活化能为0.181 9 eV。在2.55 nm的激发下,最佳Tb^(3+)掺杂浓度的CGTO:0.15Tb^(3+)荧光粉的量子效率为32.32.%。

A series of double perovskite Ca_(2) Gd1-xTaO_(6):xTb^(3+)(CGTO:xTb^(3+)) phosphors were prepared by a high-temperature solid-state reaction method.The X-ray diffraction,scanning electron microscopy,photoluminescence spectroscopy,decay curve and quantum efficiency(η) were used to characterize CGTO:xTb^(3+) phosphors.Under UV excitation,CGTO:xTb^(3+) phosphors show intense green light emission,which is originated from the characteristic 5 D4-7 F5 transition of the Tb^(3+) ion.On the basis of temperature-dependence luminescence spectra,the activation energy of thermal quenching was about 0.181 9 eV for CGTO:0.15 Tb^(3+) phosphor.CGTO:0.15 Tb^(3+) phosphor as optimum doping concentration exhibited intensive green emission with the η of 32.32% under 255 nm excitation.