掺杂铕和铽的卤硼酸盐荧光体的制备及光谱特征  

Preparation and Luminescent Properties of Rare Earth Ions in M_2B_5O_9Cl∶Re(M=Ca,Sr,Ba;Re=Eu,Tb)

作　　者：莫凤珊[1] 刘晓瑭[2] 石春山[3] 

机构地区：[1]湛江师范学院生命科学与化学学院,湛江524048 [2]华南农业大学理学院,广州510642 [3]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《高等学校化学学报》2007年第8期1519-1522,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:90201032);华南农业大学校长基金(批准号:4900-K05109)资助

摘　　要：采用高温固相法在空气中合成了一系列掺杂稀土离子的卤硼酸盐荧光体,研究了其发光性质和基质组成对稀土离子共掺杂的荧光体发光性质的影响.研究结果表明,在Eu3+和Tb3+共掺杂的体系中存在电子转移,因此出现了Eu3+,Eu2+和Tb3+共存于同一基质共同发射的现象.Ce3+对Eu2+和Tb3+具有敏化作用,可增强其发射强度.基质的组成对稀土离子的发射峰位和发射强度有明显影响.M2B5O9X： Re（M =Ca, Sr, Ba; X =Cl, Br; Re = Eu, Tb） phosphors were synthesized via solid state method. The products were characterized with X-ray powder diffraction and luminescence spectrometer. The luminescent properties as well as the influences of the matrix composition and other doping ions on the luminescence of the rare earth ions of the co-doped phosphors were investigated. The coexistence of Eu^3＋ , Eu^2＋ and Tb^3＋ were observed in these matrices. The phenomenon may be explained by the electron transfer theory. The sensitization of Ce^3＋ ion improves the intensity of emission of Eu^2＋ and Tb^3＋. The competition between electron transfer among conjugate rare earth ions and energy migration might be the reasons for the observation. We predict a novel trichromatic phosphor co-doped with Eu^3＋ -Tb^3＋ in M2B5O9X.

关 键 词：高温固相合成 光谱特征 电子转移 能量传递 

分 类 号：O644.33[理学—物理化学] O482.33[理学—化学]