Eu^(2+)在Sr_4Al_(14)O_(25)基磷光体中能量传递行为的研究  

Studies on Energy Transfer of Eu^(2+) Ions in the Sr_4Al_(14)O_(25)-Based Phosphor

作　　者：林元华[1] 南策文[1] 王海峰[2] 陈德朴[2] 蔡宁[1] 王建飞[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084 [2]清华大学化学系,北京100084

出　　处：《稀有金属材料与工程》2004年第6期606-608,共3页Rare Metal Materials and Engineering

基　　金：清华大学基础研究基金项目(JC2002036)

摘　　要：合成了3种不同Eu掺杂量的Sr4Al14O25:Eu2+, Dy3+发光粉体,发现当Eu掺杂量低于0.012 mol时,发射光谱中存在2个主发射峰,分别位于407 nm和494 nm。随着Eu掺杂浓度增加,407 nm发射峰逐渐消失,而494 nm主发射峰增强。结合Sr4Al14O25晶体结构和激发-发射光谱,建立了2种Eu发光中心之间的能量传递模型,对实验现象进行了合理的解释。余辉衰减曲线测试结果表明,3种磷光体试样均具有长余辉性能,尤其Sr3.964Al14O25:Eu0.012, Dy0.024试样,其余辉时间在人眼可视亮度水平可持续20 h以上。Three kinds of Long afterglow Sr4Al14O25: Eu2+, Dy3+ phosphor samples with various Eu2+ contents were synthesized. When the concentration of doped Eu2+ in the host was less than 0.012 mol, the emission spectra of Sr4Al14O25: Eu2+, Dy3+ has two peaks at 407 nm and 494 nm respectively, which is ascribed to two types of Eu2+ sites existing in Sr4Al14O25 matrices crystal. But the 407nm emission peak disappeared slowly with the concentration of doped Eu2+ increasing. Based on the Sr4Al14O25 crystal structure, excitation and emission spectra, the energy transfer model has been established, and a reasonable explanation was given for the experimental phenomena. In addition, the decay curves indicate that these Sr4Al14O25: Eu2+, Dy3+ phosphors have obviously a long afterglow. Especially in phosphor, the afterglow can last over 20 h in the light perception of the human eye.

关 键 词：磷光体 能量传递 发射光谱 长余辉 

分 类 号：TB34[一般工业技术—材料科学与工程]