碱土金属离子对红色长余辉材料Y2O2S∶Eu3+,M2+ (M=Mg,Ca,Sr,Ba),Ti4+纳米阵列发光性能的影响

Influence of Alkaline-earth Metal Ions on The Luminescence Properties of Y_2O_2S∶Eu^(3+),M^(2+)(M=Mg,Ca,Sr,Ba),Ti^(4+) Nanotube Arrays

采用溶胶凝胶模板法制备红色长余辉发光材料Y2O2S∶Eu3+,M2+(M=Mg,Ca,Sr,Ba),Ti4+纳米阵列,利用X射线衍射、扫描电子显微镜和荧光分光光度计、照度计分别研究了不同二价离子掺杂下所合成样品的物相、形貌及发光性能。结果表明:样品排列整齐有序,管径大小统一;不同的二价离子种类没有改变晶体结构和发射峰的位置,但对余辉性能有较大的影响。用324 nm波长光激发样品,由于Eu3+的5D0→7F2跃迁,最强的红色发射峰位于626 nm处;不同离子掺杂样品的余辉性能按Ba2+、Ca2+、Sr2+、Mg2+的顺序递加,其中二价离子为Mg2+时,余辉时间长达287 s(≥1 mcd/m2),表现出最佳的余辉性能。

Red long-lasting phosphor Y2O2S∶Eu3+,M2+( M = Mg,Ca,Sr,Ba),Ti4 +nanoarrays were synthetized by sol-gel template method. The nanoarrays were characterized by powder X-ray diffraction( XRD),scanning electron microscopy( SEM),and photoluminescence( PL). The results show that Y2O2S∶Eu3+,Mg2 +,Ti4 +nanotube arrays are highly ordered,regularly arranged and uniform. The doping ions do not change the crystal structure and the situation of emission peaks of phosphors,but have influence on the luminescence properties. Under 324 nm excitation,the strongest red-emission peaks at 626 nm assigned to5D 0 →7F 2 transition of Eu3 +. The afterglow properties of phosphors doped with different divalent ions increase according to the order of Ba2+,Ca2+,Sr2+, Mg2+. For the sample doped with Mg2 +,the decay time can last over 287 s( ≥1 mcd/m2).