title: Photoluminescence properties of NaSr(P, V)O4:Eu3+ phosphors.
abstract: Eu3+ activated NaSr(P,V)O4 phosphors have been synthesized using solid state reaction method and further characterized for their structure and optical properties using different techniques such as X-ray diffraction, scanning electron microscopy, photolumniscenec excitation, emission, and chromaticity coorrdinate analysis, etc. Material shows a broad excitation peak (monitored for lambda(ems) = 613 nm) lying in the 300-360 nm region and gives intense transitions (lambda(exc) = 320 nm) namely 5D0 --> 7F1 at 590 nm, 5D0 --> 7F2 at 613 nm, 5D0 --> 7F3 at 650 nm, and 5D0 --> 7F4 at 700 nm due to Eu3+ ion. Our results show that replacement of the PO4(3-) ions with isomorphic VO4(3-) ions improves the structural stability and the overall intensity of the emission. The maxium emission intensity is achieved for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor. An estimated increase of an order is attained for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor as compared to NaSrPO4:Eu3+ or NaSrVO4:Eu3+ phosphor. The chromaticity coordinate of the phosphor (0.68, 0.31) lies well within the red region and suggest that the material could be an alternative red phosphor for lighting and display applications.
authors.affiliation: Department of Electronic Materials Engineering, Silla University, Busan 617-736, Republic of Korea.
authors.forename: Dong Gi
authors.initials: DG
authors.lastname: Lee
authors.forename: S K
authors.initials: SK
authors.lastname: Singh
authors.forename: Chuer Hyun
authors.initials: CH
authors.lastname: Moon
authors.forename: Soung Soo
authors.initials: SS
authors.lastname: Yi
authors.forename: Kiwan
authors.initials: K
authors.lastname: Jang
authors.forename: Dong-Soo
authors.initials: DS
authors.lastname: Shin
authors.forename: Jung Hyun
authors.initials: JH
authors.lastname: Jeong
authors.forename: Jong-Seong
authors.initials: JS
authors.lastname: Bae