Abstract
Tb3+-activated Sr3Gd(BO3)3 green phosphors were prepared by conventional solid-state reaction. The vacuum ultraviolet (VUV) excitation, photoluminescence (PL) and decay properties of the phosphors in the visible range were investigated. The excitation spectrum showed a strong broad band from 160 to 200 nm with a maximum at 183 nm which was adjacent to the VUV excitation light source of 172 nm. Under excitation at 172 nm, the optimum co-doping concentration of Tb3+ was 10 mol%, and the emission intensity of Sr3Gd0.9(BO3)3:0.1Tb3+ was comparable to that of commercial Zn2SiO4:Mn2+. The strongest emission peak of Sr3Gd0.9(BO3)3:0.1Tb3+ was at 543 nm with chromaticity coordinates of (0.2626, 0.4922) and a lifetime of 2.32 ms. The optical properties of the green phosphor Sr3Gd(BO3)3: Tb3+ make it suitable for use in Hg-free fluorescent lamps and plasma display panels.
Highlights
Tb3+-activated Sr3Gd(BO3)3 green phosphors were prepared by conventional solid-state reaction
The excitation spectrum showed a strong broad band from 160 to 200 nm with a maximum at 183 nm which was adjacent to the vacuum ultraviolet (VUV) excitation light source of 172 nm
A commercial green vacuum ultraviolet (VUV) phosphor from Asa, Zn2SiO4:Mn2+ (ZSM), has high luminous efficiency and good color purity, but a long decay time (~4–23 ms), which causes a serious lag in image transformation [1]
Summary
Sr3Gd1–x(BO3): xTb3+ (0≤x≤1) samples were prepared by conventional solid-state reaction. No. chiometric ratios, SrCO3 (strontia, AR grade, Sinopharm Chemical Reagent Co. Ltd., China), H3BO3 (boric acid, AR grade, Sinopharm Chemical Reagent Co. Ltd.), Gd2O3 (gadolinia, 99.99%, Baotou Research Institute of Rare Earths, China) and/or Tb4O7 (terbia, 99.99%, Baotou Research Institute of Rare Earths) were thoroughly ground in an agate mortar; an 8 wt% excess of H3BO3 was used to compensate for its evaporation at high temperature. The mixture was heated at 800°C for 3 h in air. The mixture was reground and reheated at 1000°C for 12 h in a reducing atmosphere (5% H2/95% N2) for the Tb3+-doped samples and Sr3Tb(BO3) or in air for the undoped host compound. The final samples were obtained by cooling down to room temperature
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
