Photoluminescence properties of Eu3+ in lithium titanate

✍ Scribed by M. Mohapatra; Y.P. Naik; V. Natarajan; T.K. Seshagiri; S.V. Godbole

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 327 KB
• Volume: 406
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2011.02.070

✦ Synopsis

Lithium titanate ceramics doped with Eu were synthesized and their photoluminescence (PL) and emission spectral characteristics were investigated. PL spectra of the sample showed peaks corresponding to the 5 D 0 -7 F J (J¼ 0, 1, 2, 3 and 4) transitions under 230 nm excitation. The fluorescence lifetimes of Eu 3 þ ions were found out to be 645 ms. Strong red emission coming from the hypersensitive 5 D 0 -7 F 2 transition of Eu 3 þ ion suggested the presence of the dopant ion in highly asymmetric environment. Further analysis of the emission spectrum revealed that the symmetry of the metal ion is very low i.e. C 2 . The emission intensity of the sample was compared with a commercial phosphor to get an idea about the commercial utility of the phosphor. Various emission properties for the system namely Judd-Ofelt intensity parameters, spontaneous emission probabilities, branching ratios, radiative lifetimes and quantum efficiency were evaluated for the dopant ion by adopting standard procedure.