作　　者： ; ; ; ; ;

机构地区： 太原理工大学

出　　处： 《硅酸盐学报》 2015年第4期471-475,共5页

摘　　要： 采用溶胶-疑胶法及后续硫化过程制备了Y_2O_2S:(Tb^(3+),Eu^(3+),Mg^(2+),Ti^(4+))白色长余辉发光材料,研究了煅烧温度对样品的物相、发射光谱、余辉衰减等性能的影响。结果表明:在不同煅烧温度下样品的物相均为纯Y_2O_2S相。用262 nm波长光激发样品,不同煅烧温度下制备的样品中Tb^(3+)和Eu^(3+)发射峰的位置与形状基本相同,其中位于416 nm处蓝光与544 nm处黄绿光的主发射峰归属于Tb^(3+)的~5D_3→~7F_5与~5D_4→~7F_5跃迁,位于626 nm处红光的主发射峰归属于Eu^(3+)的~5D_0→~7F_2跃迁,混合产生白光。在烧结温度为1200℃下制备的样品有最佳的色度坐标值(0.295,0.300)和余辉时间值1051s(≥1 mcd/m^2)。 The white long-lasting phosphor Y_2O_2S:Tb^(3+),Eu^(3+),Mg^(2+),Ti^(4+) were prepared by a sol-gel method and a subsequent sulfuration process.The effect of calcination temperature on the phase,emission spectra,and the afterglow decay curve of the samples was investigated.The results show that the samples are composed of pure Y_2O_2S phases at different calcination temperatures.The position and shape of Tb^(3+) and Eu^(3+)emission peaks under the 262 nm light excitation are similar for all the samples.The blue light emission at 416 nm and the yellow-green light emission at 544 nm are originated from the ~5D_3→~7F_5 and ~5D_4→~7F_5 transitions of Tb^(3+),and the red light emission at 626 nm is originated from the ~5D_0→~7F_2 transition of Eu^(3+).The white-light can be obtained due to their appropriate mixture.The optimum chromaticity coordinate is(0.295,0.300) and the decay time is 1 051 s(≥1 mcd/m^2) for the samples synthesized at 1200℃.

关 键 词： 硫氧化钇 稀土掺杂 铽和铕共掺 白光 长余辉 溶胶 凝胶法

领　　域： [理学] [理学]