【摘要】 研究了 M3 L a(BO3 ) 3 (M=Ca,Sr,Ba)基质中 Eu3 + 的激发光谱和发射光谱。结果表明 ,最强激发峰均为 394 nm,并均有λ<30 0 nm的较强电荷迁移带 ;按 Ca— Sr— Ba的顺序 ,各发射峰峰值逐渐红移 ;Eu3 + 的最佳发射浓度分别为 x Eu3 + =0 .10、0 .0 9、0 .2 0 ;Eu3 +的 5D0 → 7F2 跃迁发射的浓度猝灭机理分别为电偶极 -四极、电偶极 -偶极和电偶极 -偶极相互作用更多还原

【Abstract】 The excitation and emission spectra of Eu 3+in M 3La(BO 3) 3(M=Ca,Sr,Ba) were investigated.The results show that the strongest excitation peak centres at 394nm and the stronger charge-transfer excitation band of Eu 3+ lies in the wave length lower than 300nm.In sequence of Ca,Sr and Ba,the emission peak red shifts gradually.The emission intensity has a maximum at x Eu 3+=0.10?0.09 and 0.20,respectively.It is confirmed that the mechanisms of concentration self-quenching of 5D 0→ 7F 2 of Eu 3+are electric dipole-quadrupole,dipole-dipole and dipole-dipole interactions respectively.更多还原