Ce^(3+),Pb^(2+)和Sn^(2+)离子在β′-Al_2O_3型六角铝酸盐1.30BaO·6Al_2O_3中的发光性质  

LUMINESCENCE OF Ce^(3+) , Pb^(2+) AND Sn^(2+) IN THE β'-ALUMINA TYPE Ba-RICH HEXAALUMINATE 1.30BaO·6Al_2O_3

作　　者：黄京根[1] 余兴海[1] 胡建国[1] 王惠琴[1] 徐燕[1] 

机构地区：[1]复旦大学材料科学研究所

出　　处：《发光学报》1990年第1期8-13,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金

摘　　要：本文研究稀土离子Ce^(3+)和S^2型离子(Pb^(2+)和Sn^(2+))在β′-Al_2O_3型富钡相六角铝酸盐1.30BaO·6Al_2O_3中的发光性质。发射光谱和激发光谱表明,在富钡相中激活离子占据两个不等当的晶体学格位。Ce^(3+)激活的样品,发射光谱由四个带组成,其相对强度不依赖于激活离子的浓度,不同Ce^(3+)发光中心间没有能量传递。对于Pb^(2+)和Sn^(2+),在紫外激发下,荧光光谱包含三个带,Pb^(2+)的带峰值为390nm,425nm和485nm;Sn^(2+)为388nm,418nm和457nm。425nm和418nm发射分别归于占据晶体学BR格位的Pb^(2+)和Sn^(2+);390nm和388nm发射归于反BR格位上的Pb^(2+)和Sn^(2+);而485nm和457nm的带分别是Pb^(2+)和Sn^(2+)的离子对的发射。离子对是由占据(Ba)_nO镜面层上的BR和反BR格位的Pb^(2+)(或Sn^(2+))所形成。Pb^(2+)和Sn^(2+)离子的发光按照S^x型离子能级作了讨论。The luminescecnee of the Al2O3 type Ba-rich hexaaluminale 1.30BaO.6Al2O3 activated with Ce3+, Pb2+ and Sn2 + is investigated. Emission and excitation spectra show the existence of two different activator centers for all these ions in the Ba-rich compound. For 1.30 BaO.6Al2O3:Ce3 + , the emission spectrum of Ce3+ ions is consisted of four bands, the relative intensities of which are independent on the activator concentration, indicating that no energy transfer takes place between two different Ce3+ centers. For the Pb2+- or Sn2 + -activated compounds, fluorescence spectra contain three bands, 390nm, 425nm and 485nm for Pb2 + and 388nm, 418nm and 457nm for Sn2 + , lespectively. The bands of 425nm and 390nm (or 418nm and 388nm) are attributed to Pb2 + (or Sn2 + ) ions, situated in the crystallographic BR and anti-BR sites, lespectively, whereas the bands of 485nm and 457nm are ascribed to pairs of Pb2 + and Sn2+ ions, respectively, whereas to their increasing intensities relative to the other two bands with increasing Pb2+ and Sn2+ concent. The formation of the ion pair is compared with data reported in the literature for SrAl12O19 :Pb2+ and is shown to be due to the interaction between the activator ions occupying the BR and anti-BR sites in the same mirror plane. Besides, the luminescence properties of Pb2+ and Sn2+ are dhcussed in the light of the energy scheme of Sn2+ ions.

关 键 词：离子 六角铝酸盐 发光性质 CE^3+ 

分 类 号：O734.3[理学—晶体学]