title: Improving green emission of Tb3+ions in BaO-B2O3-P2O5glasses by means of Al3+ions.
abstract: BaO-B2O3-P2O5glasses doped with a fixed concentration of Tb3+ions and varying concentrations of Al2O3were synthesized, and the influence of the Al3+ion concentration on the luminescence efficiency of the green emission of Tb3+ions was investigated. The optical absorption, excitation, luminescence spectra and fluorescence decay curves of these glasses were recorded at ambient temperature. The emission spectra of terbium ions when excited at 393 nm exhibited two main groups of bands, corresponding to5D3→7Fj(blue region) and5D4→ 7Fj(green region). From these spectra, the radiative parameters, viz., spontaneous emission probability A, total emission probability AT, radiative lifetime τ and fluorescent branching ratio β, of different transitions originating from the5D4level of Tb3+ions were evaluated based on the Judd-Ofelt theory. A clear increase in the quantum efficiency and luminescence of the green emission of Tb3+ions corresponding to5D4→7F5transition is observed with increases in the concentration of Al2O3up to 3.0 mol%. The improvement in emission is attributed to the de-clustering of terbium ions by Al3+ions and also to the possible admixing of wave functions of opposite parities. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India.
authors.forename: T
authors.initials: T
authors.lastname: Kalpana
authors.affiliation: Department of Physics, Kakani Venkata Ratnam College, Nandigama-521 185, A.P., India.
authors.forename: Y
authors.initials: Y
authors.lastname: Gandhi
authors.affiliation: Bhabha Atomic Research Centre, Chemistry Division, Mumbai-400 085, India.
authors.forename: V
authors.initials: V
authors.lastname: Sudarsan
authors.affiliation: Institute of Physics, Jan Dlugosz University, Ul. Armii Krajowej 13/15, Czestochowa-42-201, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Piasecki
authors.affiliation: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India.
authors.forename: V
authors.initials: V
authors.lastname: Ravi Kumar
authors.affiliation: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, A.P, India. nvr8@rediffmail.com.
authors.forename: N
authors.initials: N
authors.lastname: Veeraiah
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D017609:Barium Compounds / Q000737:chemistry*; D001895:Boron / Q000737:chemistry*; D003116:Color; D005898:Glass / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D049449:Luminescence; D010087:Oxides / Q000737:chemistry*; D017553:Phosphorus Compounds / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*
chemical_list: D017609:Barium Compounds; D007477:Ions; D010087:Oxides; D017553:Phosphorus Compounds; D013725:Terbium; C077606:barium oxide; D000535:Aluminum; D001895:Boron
keywords: Al3+ ions; BaO-B2O3-P2O5 glasses; Tb3+ ions; green emission