摘要
本文采用高温固相法合成了一系列红色荧光粉CaWO_(4)∶Eu^(3+),Bi^(3+)。通过X射线衍射仪、扫描电子显微镜和荧光分光光度计等手段,对样品的晶体结构、微观形貌、光学性能、能量传递方式、荧光寿命和热稳定性进行了表征。结果表明,当Eu^(3+)和Bi^(3+)的掺杂浓度分别为7%和2%时(摩尔分数),荧光粉红色发光(615 nm)最强,理论计算得到荧光粉的平均颗粒尺寸为50.27 nm,这与电子显微镜观察结果相符合。能量传递方式以电偶极-电四极相互作用为主,对CaWO_(4)∶7%Eu^(3+),yBi^(3+)(y=0~6%)系列荧光粉进行了荧光寿命测量,发现它们荧光寿命基本相同,都在0.56 ms左右。对CaWO_(4)∶7%Eu^(3+),2%Bi^(3+)荧光粉在不同温度下的光谱进行比较,并且计算相应的色度坐标,当温度升高时,色度坐标整体左移,发光强度有所变弱,但整体来说热稳定性较好。较好的热稳定性和明亮红光发射表明该荧光粉可以作为潜在商用红光荧光粉。
A series of CaWO_(4)∶Eu^(3+),Bi^(3+)red phosphors were successfully synthesized by high temperature solid-state reaction.The crystal structure,microstructure,optical property,energy transfer mode,fluorescence lifetime,and thermal stability of samples were characterized by X-ray diffraction,scanning electron microscope and fluorescence spectrophotometer,etc.The results show that when the doping concentrations of Eu^(3+)and Bi^(3+)are 7%and 2%(mole fraction),respectively,the red luminescence(615 nm)is the strongest.Theoretical calculations show that the size of this fluorescent powder particle is around 50.27 nm.This is consistent with the observation results of the electron microscope.The main mode of energy transfer is the interaction between electric dipoles and electric quadrupoles.The fluorescence lifetime of CaWO_(4)∶7%Eu^(3+),x Bi^(3+)(x=0~6%)series phosphors were measured,and their fluorescence lifetimes were basically the same,all around 0.56 ms.By comparing the spectra of CaWO_(4)∶7%Eu^(3+),2%Bi^(3+)phosphors at different temperatures,and the corresponding chromaticity coordinates were calculated.It was found that the overall chromaticity coordinates shift to the left,and the luminescence intensity becomes weaker as the temperature increases,but overall,the thermal stability is good.The good thermal stability and bright red emission indicate that this fluorescent powder can be used as a potential commercial red fluorescent powder.
作者
蔡小勇
姜洪喜
CAI Xiaoyong;JIANG Hongxi(Graduate College,Heilongjiang University of Science and Technology,Harbin 150022,China;Jiaying University,Meizhou 514015,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第5期833-840,共8页
Journal of Synthetic Crystals
