摘要
采用高温固相法制备了Sr_(6)GdAl(BO_(3))_(6)∶xDy^(3+)荧光粉,研究了其晶体结构、发光特性、能量传递机理、荧光衰减曲线、色坐标和变温光谱。在紫外光激发下,样品在315 nm处的发射峰源于Gd^(3+)的^(6)P_(7/2)→^(8)S_(7/2)能级跃迁;484 nm和578 nm处的发射峰源于Dy^(3+)的^(4)F_(9/2)→^(6)H_(15/2)、^(4)F_(9/2)→^(6)H_(13/2)能级跃迁,Sr_(6)GdAl(BO_(3))_(6)∶xDy^(3+)荧光粉发出白光。随着Dy^(3+)掺杂浓度变化,样品色坐标与CIE色度图中的“理想白光点”(x=0.33,y=0.33)比较接近。样品中存在Gd^(3+)到Dy^(3+)的能量传递,能量传递效率高达90.59%。样品表现出负热猝灭效应,当温度为543 K时,发光强度为室温的103.6%,具有良好的热稳定性。结果表明,Sr_(6)GdA(l BO_(3))_(6)是一种潜在的可用于紫外保健灯的荧光粉,Sr_(6)GdA(l BO_(3))_(6)∶xDy^(3+)是一种可被紫外光激发的白光荧光粉。
The Sr_(6)GdAl(BO_(3))_(6)∶xDy^(3+)phosphors were synthesized by high-temperature solid-state reaction.The crystal structure,luminescence properties,energy transfer mechanisms,photoluminescence decay curves,CIE coordinates and temperature dependent emission spectra were investigated.Under UV excitation,the emission peak at 315 nm is attributed to the ^(6)P_(7/2)→^(8)S_(7/2) transition of Gd^(3+),the emission peaks at 484 nm and 578 nm are attributed to the ^(4)F_(9/2)→^(6)H_(15/2) and ^(4)F_(9/2)→^(6)H_(13/2) transitions of Dy^(3+),the Sr_(6)GdAl(BO_(3))_(6)∶xDy^(3+)phosphors exhibited white emission.The CIE coordinates of the samples with different Dy^(3+)concentrations were close to the ideal white point(x=0.33,y=0.33)in the CIE chromaticity diagram.Energy transfer from Gd^(3+)to Dy^(3+)was observed in the samples,with an efficiency as high as 90.59%.A negative thermal quenching effect was observed,where the emission intensity at 543 K was maintained at 103.6% of the room-temperature value,indicating excellent thermal stability.These results indicate that Sr_(6)GdAl(BO_(3))_(6) is identified as a potential phosphor for UV healthcare lamps.Furthermore,the Dy^(3+)-doped Sr_(6)GdAl(BO_(3))∶xDy^(3+)is a white-light-emitting phosphor that can be excited by ultraviolet light.
作者
闵睿
孙晓园
李敏
谭琴琴
李诚
杨椿洋
MIN Rui;SUN Xiaoyuan;LI Min;TAN Qinqin;LI Cheng;YANG Chunyang(Department of Physics,Changchun Normal University,Changchun 130032,China;Department of Chemistry,Jilin Normal University,Changchun 130103,China)
出处
《发光学报》
北大核心
2026年第1期114-123,共10页
Chinese Journal of Luminescence
基金
吉林省科技发展计划(YDZJ202101ZYTS176)。
