摘要
本文讨论了BaYF_5中Eu^(2+)和Ce^(3+)的光谱特征及浓度对光谱的影响。Eu^(2+)和Ce^(3+)均表现为d—f跃迁的特征激发和发射。由于Eu^(2+)—Eu^(2+),Ce^(3+)—Ce^(3+)能量迁移的存在,两者猝灭浓度偏低,其猝灭机理为偶极-偶极相互作用。根据BaYF_5基质中Eu^(2+)和Ce^(3+)的能级关系,发现Ce^(3+)对Eu^(2+)的发射具有明显的敏化作用。其机理主要为非辐射多极子作用,但也存在辐射传递。
In present paper luminescent characteristics of Eu (Ⅱ) and Ce(Ⅲ) and their concentra-tion quenching in BaYF_5 are studied. Both ions show d-f excitation and emission. Bycomparison with the values reported before,the quenching concentrations of Eu(Ⅱ) and Ce(Ⅲ)are lower because of the energy migration in Eu(Ⅱ)--Eu(Ⅱ) and Ce(Ⅲ)--Ce(Ⅲ). Thequenching mechanism is acquired by the relation between their emission intensities and theirconcentrations, which is dipole-dipole interaction. The energy transfer from Ce (Ⅲ) to Eu(Ⅱ) was found in the system BaYF_5. A mechanism ot radiationless energy transfer isproposed based on the electric multipole-multipole interaction in the system .There also exista radiative transfer. A possible way for energy transfer is given.
出处
《应用化学》
CAS
CSCD
北大核心
1989年第5期26-30,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
关键词
氟化钇钡
铕
铈
激活
荧光
Barium and Yttrium fluoride
Euripium (Ⅱ)
Cerium (Ⅲ)
Activation
Luminescence
