铽激活碱土硼硅酸盐玻璃的长余辉发光性质  

Long Lasting Phosphorescence of Tb^(3+)-doped Alkaline Earth Borosilicate Glasses

作　　者：赵建军[1] 李成宇[1] 王淑彬[1] 苏锵[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理重点实验室,吉林长春130022

出　　处：《发光学报》2004年第6期655-660,共6页Chinese Journal of Luminescence

基　　金：国家重点基础研究规划资助项目(G1998061312)

摘　　要：首次报道了一种新型的长余辉发光材料,即Tb3+激活的钡硼硅长余辉发光玻璃。经254nm的紫外灯(辐照度为4.07mW/cm2)照射30min后,该玻璃发出明亮的绿色长余辉,其余辉在黑暗中持续8h以上仍肉眼可辨。比较样品的余辉光谱和荧光发射光谱,发现两者的峰形、峰位基本相同,说明玻璃样品的绿色余辉发射中心,来自于Tb3+的特征发射。余辉发射的峰值波长位于543nm,对应于Tb3+的5D4→7F5跃迁。我们通过吸收光谱、荧光的激发和发射光谱、余辉衰减曲线、余辉发射光谱及热释光谱等表征方法,系统地对这种玻璃材料的荧光和长余辉发光性质进行了研究,并讨论了可能的长余辉发光的机理。The glasses have some advantages over polycrystalline forms because it is easier to be fabricated into products with various shapes such as bulk plates and fibers. The glasses with long lasting phosphorescence phenomenon are worth investigating thoroughly not only for its conventional use as indicator or craftwork in darkness, but also on account of searching new optoelectronic materials or optical storage devices. In this article, a new long afterglow luminescent glass material was synthesized and reported. The long lasting phosphorescent glass with the composition (in mol%) of 40BaO-10B_2O_3-50SiO_2∶0.2Tb_2O_3 (BBST) was synthesized by the high temperature solid-state reaction at atmosphere ambient. The glass sample was characterized by the IR, UV-Vis absorption, fluorescence and thermoluminescence spectra, respectively. Bright green long lasting phosphorescence was observed in Tb^(3+)-doped barium borosilicate glasses after the irradiation with a UV lamp (λ_(max)=254 nm) for 30 min at room temperature. This green phosphorescence can be observed with naked eyes in the dark for up to 8 h after removing the UV lamp. The afterglow phosphorescence spectrum with dominant peak at 543 nm is almost identical with the emission spectrum of BBST glass sample in peak-position and shape. This indicates that the green phosphorescence originates from the characteristic emission of Tb^(3+). The peak at 543 nm of the phosphorescence spectrum is associated with ()~5D_4→()~7F_5 transition of Tb^(3+). The decay curve of the afterglow does not obey a simple exponential rule. The phosphorescence decays quickly at former 200 s and then decreases slowly in latter stage. The themoluminescence curve of BBST glass sample consists of five Gaussian-fitted components, which suggests that many kinds of traps exist in the glass matrix. The possible mechanism of the long lasting phosphorescence is suggested to be due to the recombination of electrons and holes at shallow traps in the glass matrix that can be thermally released at room tem

关 键 词：长余辉 玻璃 铽离子 陷阱 

分 类 号：O482.31[理学—固体物理]