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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
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