Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+)红色材料的制备和长余辉性能  

Synthesis of Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) Red Phosphor by Flux Fusion Method and Its Characteristic

作　　者：杨志平[1] 郭智[1] 王文杰[1] 朱胜超[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《发光学报》2004年第2期183-187,共5页Chinese Journal of Luminescence

基　　金：河北科学技术发展基金(51215103b)

摘　　要：用高温固相法制备了Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+)红色长余辉材料,余辉时间达到1h以上,X射线衍射测量表明材料的晶体结构为Y_2O_2S。发射光谱对应了Eu^(3+)离子~5D_J(J=0,1,2,3)→~7F_J(J=0,1,2,3,4)的特征发射;激发光谱主峰位于345 um,另外在260,396,468,540 um等处也存在激发峰。对比测量了Y_2O_2S:Eu^(3+),Mg^(2+),Ti_(4+)和Y_2O_2S:Eu^(3+)的热释发光曲线,Y_2O_2S:Eu^(3+)的热释发光曲线可以拟合成3个热释发光峰的叠加:237,226,301K;而Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+)的热释发光曲线可以拟合成5个热释发光峰的叠加:149,215,262,287,334 K,并计算了相应的陷阱能级。Ti^(4+)是引起较深陷阱能级的主要原因,Mg^(2+)起电荷补偿的作用。Synthesis of Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) red phosphor by flux fusion method was presented. The X-ray diffraction analysis showed that the crystal structure was Y_2O_2S. the decay curves of Y_2O_2S: Eu^(3+) and Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) were measured, the afterglow time of Y_2O_2S: Eu^(3+) was about 30 min, the afterglow time of Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) was over 70 min. The emission spectra and excitation spectra of the phosphor were acquired. The emission spectra showed that Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) had narrow emission peaks: the emission peaks at 583.5 nm(~5D_0→~7F_0); 595.5, 597.3 nm(~5D_0→~7F_1); 617.3, 627.0 nm(~5D_0→~7F_2); 705.3, 707.0 nm(~5D_0→~7F_4) ascribed to Eu^(3+) ions transition from ~5D_0→~7F_J (J=0, 1, 2, 3, 4); 556.4 nm(~5D_1→~7F_2); 587.6, 589.5 nm(~5D_1→~7F_3) ascribed to Eu^(3+) ionstran- sition from ~5D_1 to ~7F_J(J=2, 3); 467.8, 469.5 nm(~5D_2→~7F_0); 475.5, 477.5 nm(~5D_2→~7F_1); 488.3, 490.6 nm (~5D_2→~7F_2); 513.0, 514.0 nm(~5D_2→~7F_3); 540.1, 544.3 nm(~5D_2→~7F_4) ascribed to Eu^(3+) ions transition from ~5D_2→~7F_J(J=0, 1, 2, 3, 4); 497.0 nm(~5D_3→~7F_5) ascribed to Eu^(3+) ions transition from ~5D_3→~7F_J (J=5) were found. The characteristic red emission at 617.3, 627.0 nm were due to the dominant ~5D_0→~7F_2 electric dipole tran- sition, and the emission at 627.0 nm was dominant. Due to the function of weak crystal field, the emission ascribed to energy transition ~5D_1→~7F_3, ~5D_0→~7F_1 and ~5D_0→~7F_4 divided. The excitation spectra of Y_2O_2S: Eu^(3+), Mg^(2+), Ti^(4+) showed that it had excitation peaks at 345, 260, 396, 468, 540 nm, etc. The excitation peak at 345 nm was ascribed to the absorption of charge transfer (Eu^(3+) - O^(2-), Eu^(3+) - S^(2-)). The excitation peaks at 468, 520, 540 nm were ascribed to the representative 4f-4f energy transition of Eu^(3+

关 键 词：高温固相法 长余辉 激发光谱 发射光谱 热释发光 稀土发光材料 发光效率 晶体结构 铒离子 镁离子 

分 类 号：O482.31[理学—固体物理]