摘要
本文采用高温固相法合成了一系列Na_(5)Y_(1-x)(MoO_(4))_(4-y)(WO_(4))y∶xSm^(3+)(x=0~0.10,y=0~4)橙红色荧光粉。通过粉末衍射、透射电镜、常温/变温荧光发射谱、荧光激发谱、荧光动态衰减曲线和CIE色度坐标等光谱手段对荧光粉样品的光谱性能进行了研究。粉末衍射结果表明,合成的样品相位与Na_(5)Y(MoO_(4))_(4)的标准相一致,Sm^(3+)掺杂与引入(WO_(4))2-均未改变材料的相结构。在波长为406 nm光源的激发下,Na_(5)Y0.92(MoO_(4))3WO_(4)∶0.08Sm^(3+)荧光粉在643 nm附近橙红色荧光发射强度最高,继续增加Sm^(3+)的掺杂浓度,存在荧光猝灭现象,浓度猝灭的主要原因归为电偶极-电偶极相互作用。研究发现,Na_(5)Y(MoO_(4))_(4)基质中掺杂Sm^(3+)会引起电负性改变和晶格畸变,在Na_(5)Y_(1-x)(MoO_(4))_(4)∶xSm^(3+)中引入(WO_(4))2-阴离子基团,可以弥补因掺杂Sm^(3+)出现的缺陷,改善Na_(5)Y(MoO_(4))_(4)∶xSm^(3+)荧光粉的发光性能。在300~440 K,样品具有优异的热稳定性,荧光发射强度均超过室温时的96%;其CIE色度坐标均位于橙红光区域。以上结果表明新型Na_(5)Y_(1-x)(MoO_(4))_(4-y)(WO_(4))y∶xSm^(3+)橙红色荧光粉在WLED应用上有潜在价值。
A series of orange-red phosphors,Na_(5)Y_(1-x)(MoO_(4))_(4-y)(WO_(4))y∶xSm^(3+)(x=0~0.10,y=0~4),were synthesized by high temperature solid state method.The properties of the phosphor samples were studied by means of X-ray diffraction,transmission electron microscope,normal/variable temperature fluorescence emission spectrum,fluorescence excitation spectrum,fluorescence dynamic attenuation curve,CIE chromaticity coordinates and so on.XRD results show that the phase of the synthesized samples is consistent with the standard of Na_(5)Y(MoO_(4))_(4),and the phase structure of the materials is unchanged by introducing Sm^(3+)or(WO_(4))2-.Under the excitation of 406 nm,Na_(5)Y0.92(MoO_(4))3(WO_(4)):0.08Sm^(3+)has the highest emission intensity.With increasing doping concentration of Sm^(3+),the concentration quenching phenomenon appears,and the main reason for the concentration quenching is attributed to the electric dipole-electric dipole interaction.The study found that the doping of rare earth ions in the Na_(5)Y(MoO_(4))_(4)matrix would cause electronegativity changes and lattice distortion.The introduction of(WO_(4))2-anionic groups into Na_(5)Y_(1-x)(MoO_(4))_(4)∶xSm^(3+)can make up for the defects caused by the doping of Sm^(3+)and further improve the luminescence performance of Na_(5)Y_(1-x)(MoO_(4))_(4)∶xSm^(3+)phosphors.In the range from 300 K to 440 K,the samples have excellent thermal stability,and the fluorescence intensity is more than 96%higher than that at room temperature.The CIE chromaticity coordinates are located in the orange-red region.These results indicate that the Na_(5)Y_(1-x)(MoO_(4))_(4-y)(WO_(4))y∶xSm^(3+)phosphor has potential value in WLED applications.
作者
胡正开
杨伟斌
熊飞兵
郭益升
白鑫
李明明
HU Zhengkai;YANG Weibin;XIONG Feibing;GUO Yisheng;BAI Xin;LI Mingming(School of Optoelectronics and Communication Engineering,Xiamen University of Technology,Xiamen 361024,China;Fujian Key Laboratory of Optoelectronic Technology and Devices,Xiamen University of Technology,Xiamen 361024,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第6期1016-1025,共10页
Journal of Synthetic Crystals
基金
福建省自然科学基金(2020J01297)
厦门理工学院研究生科技创新计划项目(YKJCX2023111)。
