摘要
经高温固相反应合成YVO4∶xEr3+(x=0.001,0.003,0.005,0.007,0.01,0.03,0.05,0.07,0.09,0.1摩尔比)绿色系列粉末状发光材料。经X射线衍射分析产物为单相,属四方锆英石结构。检测了材料的真空紫外激发光谱和发射光谱。发现,YVO4∶xEr3+(x=0.001,0.003,……,0.1摩尔比)的真空紫外激发光谱,在120nm～350nm范围内形成若干个连续的带状峰,应该归属于VO34-离子团的吸收带。在紫外和真空紫外激发下,样品的发射光谱均产生两个明显的锐锋,峰值在523nm和552nm附近,分别对应于Er3+离子的2H11/2→4I15/2,4S3/2→4I15/2跃迁;其中4S3/2→4I15/2的跃迁明显强于2H11/2→4I15/2。随着Er3+含量X由0.001增加到0.003,YVO4∶xEr3+发射光谱强度逐渐增加到最大值,之后随着x继续增加发射光谱强度逐渐下降,呈现明显的浓度猝灭现象。
The samples of YVO4∶x Er3＋（x=0.001,0.003,0.005,0.007,0.01,0.03,0.05,0.07,0.09,0.1） were synthesized by the conventional solid state reaction.XRD measurements confirmed that the prepared YVO4∶xEr3＋ belonged to the Quartet zircon structure.The luminescent properties were studied by the excitation and emission spectra.It has been found that,the excitation spectra of YVO4∶Er3＋ are composed of series broad bands from 120 nm and 350 nm,the peak at 155nm was assigned to the VO3-4 absorption.The emission spectra of samples are composed of two narrow peaks,at 523nm and 552 nm corresponding to 2H11/2→4I15/2 and 4S3/2→4I15/2 transition of Er3＋ respectively.Both excited by UV or VUV,the samples emission intensity according to 4S3/2→4I15/2 transition was stronger than the 2H11/2→4I15/2.The emission peak value and intensity changed with the different excited length,it related to the excitation mechanism and energy transmission channels under different conditions.With the concentration of Er3＋ increased from 0.001 to 0.003,the emission intensity gradually increased to the maximum.As the concentration continue to increase,the emission intensity began to decline,showing aclear concentration quenching phenomenon.
出处
《稀土》
EI
CAS
CSCD
北大核心
2011年第1期37-41,共5页
Chinese Rare Earths
基金
国家发改委稀土办稀土应用研究项目(2007第14号)
