【摘要】 采用水热法合成了YF₃:xEu³⁺和YF₃:0.14Eu³⁺,0.08Gd³⁺系列荧光粉。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、光电子能谱（EDS）、光致发光（PL）和长余辉光谱分别对样品的物相、结构、形貌、表面元素、PL和荧光寿命进行了表征。XRD检测表明,合成的样品属正交晶系。ED数据验证了合成样品的表面元素组分。PL光谱测试表明,YF₃:xEu³⁺的激发光谱由200³00nm的宽带和Eu³⁺的系列窄带激发峰组成,YF₃:0.14Eu³⁺,0.08Gd³⁺的激发光谱由200³00nm的宽带和Eu³⁺,Gd³⁺的系列窄带激发峰组成。在319nm紫外光激发下,测得YF₃:xEu³⁺材料的发射光谱为一个多峰谱,主峰位于593,613nm。当Eu³⁺掺杂物质的量的浓度大于14%时,出现了浓度猝灭现象。在319nm紫外光激发下,YF₃:0.14Eu³⁺,0.08Gd³⁺的发射光谱出现Eu³⁺的5D0→7F1（593nm,橙光）、5D0→7F2（613nm,红光）跃迁发光峰,此时,Gd³⁺的掺杂能增强Eu³⁺的发光。通过色坐标分析可知,当激发波长为374nm时,YF₃:0.14Eu³⁺的色坐标为（0.337 2,0.239 4）,是很好的红色发光粉。对YF₃:xEu³⁺和YF₃:0.14Eu³⁺,0.08Gd³⁺的荧光衰减曲线的拟合证实,存在Gd³⁺→Eu³⁺的能量传递。更多还原

【Abstract】 The YF₃:xEu³⁺and YF₃:0.14Eu³⁺,0.08Gd³⁺phosphors were synthesized by hydrothermal method.The as-prepared products are studied by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS）,photoluminescence（PL）spectroscopy and longlasting phosphorescence.The results by XRD indicate that YF₃:xEu³⁺and YF₃:0.14Eu³⁺,0.08Gd³⁺belong to an orthorhombic crystal system.Photoelectron spectroscopy measurement from YF₃:xEu³⁺and YF₃:0.14Eu³⁺,0.08Gd³⁺reveals the binding energy of the elements onto the product surfaces.The excitation spectra of YF₃:xEu³⁺exhibit a broad absorption band in the range of 200-300 nm and a series of individual absorption peaks of Eu³⁺.The excitation spectrum of YF₃:0.14Eu³⁺,0.08Gd³⁺exhibits a broad absorption band in the range of 200-300 nm and a series of individual absorption peaks of Gd³⁺and Eu³⁺.The emission spectra of YF₃:xEu³⁺show two peakss at 593 nm and 613 nm respectively at 319 nm excitation.The luminous intensity of the sample becomes more intensive along with the increase of the Eu³⁺doping amount,and it could be the maximum at Eu³⁺ion content of 14%.Upon excitation at 319 nm,the YF₃:0.14Eu³⁺,0.08Gd³⁺shows the strong characteristic emission of Eu³⁺,which indicates the efficient energy transfer from Gd³⁺to Eu³⁺.The energy transfer is confirmed to occur between Gd³⁺and Eu³⁺when the decay spectrum of Eu³⁺is fitted by fitting the decay spectra.From Commission Internationale de L′Eclairage（CIE）chromaticity diagram,it is noted that red light can be achieved in the emission spectra of YF₃:0.14Eu3+phosphor at 374 nm excitation,and the CIE color coordinates of（0.337 2,0.239 4）are close to the standard color coordinates.更多还原