摘要
采用水热法合成了YF_3:xEu^(3+)和YF_3:0.14Eu^(3+),0.08Gd^(3+)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,YF_3:xEu^(3+)的激发光谱由200~300nm的宽带和Eu^(3+)的系列窄带激发峰组成,YF_3:0.14Eu^(3+),0.08Gd^(3+)的激发光谱由200~300nm的宽带和Eu^(3+),Gd^(3+)的系列窄带激发峰组成。在319nm紫外光激发下,测得YF_3:xEu^(3+)材料的发射光谱为一个多峰谱,主峰位于593,613nm。当Eu^(3+)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,YF_3:0.14Eu^(3+),0.08Gd^(3+)的发射光谱出现Eu^(3+)的5D0→7F1(593nm,橙光)、5D0→7F2(613nm,红光)跃迁发光峰,此时,Gd^(3+)的掺杂能增强Eu^(3+)的发光。通过色坐标分析可知,当激发波长为374nm时,YF_3:0.14Eu^(3+)的色坐标为(0.337 2,0.239 4),是很好的红色发光粉。对YF_3:xEu^(3+)和YF_3:0.14Eu^(3+),0.08Gd^(3+)的荧光衰减曲线的拟合证实,存在Gd^(3+)→Eu^(3+)的能量传递。
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 mi- croscopy （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 ：xEua＋ 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 Eua＋. The excitation spectrum of YFa ：0.14Eu3＋ ,0. 08Gd3＋ exhibits a broad absorption band in the range of 200--300 nm and a series of individual absorption peaks of Gda＋ and Eu3＋. The emission spectra of YF3 ：xEua＋ 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 Eua＋ is fitted by fitting the decay spectra. From Commission Internationale de LrEclairage （CIE） chromaticity diagram,it is noted that red light can be achieved in the emission spectra of YF3 ..0. 14Eua＋ phosphor at 374 nm excitation, and the CIE color coordinates of （0. 337 2,0. 239 4） are close to the standard color coordinates. Key words：YF3：Eu3＋ ,Gd3＋ ; luminescent material; red light
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2015年第12期2331-2339,共9页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(21101133)资助项目
关键词
YF3:Eu^3+
Gd^3+
发光材料
红光
Absorption spectroscopy
Binding energy
Emission spectroscopy
Energy transfer
Excited states
Light
Light emission
Luminescence
Phosphors
Photoelectron spectroscopy
Photoluminescence spectroscopy
Scanning electron microscopy
Semiconductor quantum wells
Spectrometers
X ray photoelectron spectroscopy
X ray powder diffraction
