【摘要】 用固相烧结法制备了亮度高、余辉时间长的 Ca Al2 O4:Eu,RE(RE为 Nd,Dy)发光粉体材料 ,并对其发光性能进行了研究。发光粉体的发射光谱表明 ,其主发射峰均位于 44 0 nm左右。余辉衰减曲线证明其余辉衰减过程存在快速衰减和慢衰减两个过程。对于长余辉发光机制 ,认为 Nd,Dy的加入起到了陷阱能级作用 ,从而延长了发光时间 ,增强发光亮度。并且在此基质材料中 ,Nd的陷阱深度比 Dy的更合适 ,因而 Ca Al2 O4:Eu,Nd的发光性能要优于 Ca Al2 O4:Eu,Dy更多还原

【Abstract】 The long afterglow and high brightness of CaAl 2O 4:Eu,RE(RE:Nd,Dy) luminescent materials were prepared by the solid sintering method The luminescent properties were studied, the emission spectra showed that both of the main peaks lie in about 440nm, and the decay curve indicated that the decay process contains the rapid decaying and slow decaying processes The long afterglow mechanism is considered to be that the doped Dy 3+ and Nd 3+ worked as hole traps, they prolonged the luminescent time and enlarged the brightness The trap depth of CaAl 2O 4:Eu,Nd is more suitable than that of CaAl 2O 4:Eu,Dy, and therefore, the luminescent properties of CaAl 2O 4:Eu,Nd are superior to that of CaAl 2O 4:Eu,Dy更多还原