双钙钛矿结构Sr_(2)GdSbO_(6):Eu^(3+)荧光粉的制备与表征  

Preparation and Characterization of Double Perovskite Sr_(2)GdSbO_(6):Eu^(3+)Phosphor

作　　者：方志雄 易双萍[1] 周一轩 赵韦人[1] Fang Zhi-xiong;Yi Shuang-ping;Zhou Yi-xuan;Zhao Wei-ren(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《广东工业大学学报》2023年第2期88-94,共7页Journal of Guangdong University of Technology

基　　金：广东省科技创新战略专项(2018B090902003)。

摘　　要：采用高温固相法成功制备了双钙钛矿结构的Sr_(2)GdSbO_(6):Eu^(3+)红色荧光粉,并表征了其XRD、光致发光光谱和荧光衰减寿命曲线。Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)荧光粉的XRD图谱的峰位与标准卡片峰位基本吻合,表明Eu^(3+)的掺杂并未改变基质的晶体结构,Rietveld精修后的晶体参数也验证了该结果。样品的激发光谱为紫外光区的一个以340 nm为中心的宽光谱;在340 nm光源的激发下,样品的最强发射是一个中心波长为593 nm的橙红光发射波段。运用Dexter理论分析出样品的浓度淬灭机理为偶极-偶极相互作用。常温下Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)荧光粉的荧光衰减寿命为4.202 ms,外量子效率为24.8%,升温至150℃时其外量子效率仍保持为常温下外量子效率的68.8%。经计算得到Sr_(2)GdSbO_(6):Eu^(3+)荧光粉的色纯度最高可达99.5%。将Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)荧光粉、蓝粉、绿粉以及365 nm的紫外芯片封装制作成的LED器件可以发射出亮眼的白光。这些结果表明Sr_(2)GdSbO_(6):Eu^(3+)荧光粉是一种潜在的用于白光LED的红色荧光粉。The Sr_(2)GdSbO_(6):Eu^(3+)red phosphor with double perovskite structure was successfully prepared by high temperature solid phase method and its XRD,photoluminescence spectrum and fluorescence decay lifetime were characterized.The XRD of the Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)phosphor is basically consistent with the peak position of the standard card,indicating that the doping of Eu^(3+)did not change the crystal structure of the matrix.The crystal parameters after Rietveld refinement also verify the result.The photoemission spectrum shows that the sample has a wide excitation area centered at 340 nm in the ultraviolet region;under the excitation of a 340 nm light source,the strongest emission of the sample is an orange-red emission band with a center wavelength of 593 nm.Using Dexter theory to analyze the concentration quenching mechanism of the sample is the dipole-dipole interaction.The fluorescence decay life of Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)phosphors at room temperature is 4.202 ms,and the external quantum efficiency is 24.8%.When the temperature is raised to 150℃,the external quantum efficiency remains 68.8%of that at room temperature.The calculated color purity of Sr_(2)GdSbO_(6):Eu^(3+)phosphor can reach 99.5%.Sr_(2)Gd_(0.8)SbO_(6):0.2Eu^(3+)phosphor,blue phosphor,green phosphor and 365 nm UV chip package were made into LED devices which can emit bright white light.These results indicate that Sr_(2)GdSbO_(6):Eu^(3+)phosphor is a potential red phosphor for white LED.

关 键 词：稀土离子 双钙钛矿 红色荧光粉 发光性能 

分 类 号：O482.31[理学—固体物理]