【摘要】 通过研究Eu²⁺在LiAl₅O₈和Al₂O₃基质中的荧光性质,发现Eu²⁺在LiAl₅O₈和a-Al₂O₃基质中产生f→f跃迁发射,在a-Al₂O₃和r-Al₂O₃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Eu²⁺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.更多还原

【Abstract】 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.更多还原