Eu^(2+)激活的LiAl_5O_8和Al_2O_3的荧光性质  

Luminescence of Eu^(2+) in LiAl_5O_8 and A1_2O_3

作　　者：刘应亮[1] 李沅英[2] 杨燕生[2] 石春山[3] 

机构地区：[1]暨南大学化学系,广州510632 [2]中山大学化学系,广州510275 [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：《化学学报》1997年第2期178-183,共6页Acta Chimica Sinica

基　　金：稀土化学与物理开放实验室资助课题

摘　　要：通过研究Eu^(2+)在LiAl_5O_8和Al_2O_3基质中的荧光性质,发现Eu^(2+)在LiAl_5O_8和a-Al_2O_3基质中产生f→f跃迁发射,在a-Al_2O_3和r-Al_2O_3的混合相中Eu^+2的f→f跃迁发射消失,产生一新的带状发射.运用晶场和共价理论及晶体结构数据对实验结果进行详细讨论,采用电负性平均化原理和Sanderson电负性标度计算基质中Eu^(2+)所带分电荷及Eu-O键的离子性百分数,合理地解释了实验结果.The f→f transition emission of Eu2 + in LiAl5O3 and α - Al2O3 is found for the firsttime, disappearing of the f→f transition emissiom of Eu2+ and there existing a new band emissionin mixture phases of α - Al2O3 and γ - Al2O3. The experimental results are discussed in detail by crystal structure data of hosts and theory of crystal field and covalence. Partial charge of Eu2+ and ionic percentage of Eu-O( F) and M-O(F) in hosts are calculated by Sanderson's theory, a content explanation of the experimental phenomena being obtained.

关 键 词：铕 荧光性质 共价效应 LiAl5O8 氧化铝 

分 类 号：O614.338[理学—无机化学]