Photoluminescence in MgxSr1−xAl2O4:Eu2+, Nd3+and electron–vibrational interaction in the Eu2+ 5d states

✍ Scribed by K.S. Bartwal; H. Ryu; M.G. Brik; I. Sildos

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 276 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.05.033

✦ Synopsis

Green phosphor compositions Mg x Sr 1Àx Al 2 O 4 :Eu, Nd (with x ¼ 0.05-0.25) were prepared by solid state reaction method. The effect of Mg substitution on photoluminescence characteristics was investigated. The photoluminescence show intense green emission for MgSrAl 2 O 4 :Eu 2+ , Nd 3+ with long persistence. This green emission corresponds to transitions from 4f 6 5d 1 to 4f 7 of Eu 2+ ion. Comparative analysis of the excitation and emission spectra were used to evaluate the crystal field splitting of the 5d states of Eu 2+ and the parameters of electron-vibrational interaction, such as Huang-Rhys factor, effective phonon energy, and zero-phonon line position.