title: Synthesis and luminescence properties of Ca3Ga2Si3O12:RE3+ (RE = Eu/Tb) powder phosphors.
abstract: Rare earth ions (Eu(3+) or Tb(3+) )-activated Ca(3) Ga(2) Si(3) O(12) (CaGaSi) phosphors were synthesized by using a sol-gel method. Photoluminescence spectra of Eu(3+):CaGaSi phosphors exhibited five emission bands at 578, 592, 612, 652 and 701 nm, which were assigned to the transitions ((5)D(0) → (7)F(0), (7)F(1,)(7)F(2), (7)F(3) and (7)F(4)), respectively, with an excitation wavelength of λ(exci) = 392 nm. Among these, the transition (5) D(0) → (7) F(2) (612 nm) displayed bright red emission. In the case of Tb(3+):CaGaSi phosphors, four emission bands were observed at 488 ((5)D(4) → (7)F(6)), 543 ((5)D(4) → (7)F(5)), 584 ((5)D(4) → (7)F(4)) and 614 nm ((5)D(4) → (7) F(3) ) from the measurement of PL spectra with λ(exci) = 376 nm. Among these, the transition (5)D(4) → (7) F(5) at 543 nm displayed bright green emission. The structure and morphology of the phosphors were studied from the measurements of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX) results.
authors.affiliation: Department of Physics, SV Degree College, Kadapa, YSR District, 516003, India.
authors.forename: M Bhushana
authors.initials: MB
authors.lastname: Reddy
authors.forename: S
authors.initials: S
authors.lastname: Sailaja
authors.forename: K Vemasevana
authors.initials: KV
authors.lastname: Raju
authors.forename: C Nageswara
authors.initials: CN
authors.lastname: Raju
authors.forename: P
authors.initials: P
authors.lastname: Giridhar
authors.forename: B Vengala
authors.initials: BV
authors.lastname: Rao
authors.forename: B Sudhakar
authors.initials: BS
authors.lastname: Reddy
mesh_terms: D049449:Luminescence; D008674:Metals, Rare Earth / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D033362:Powder Diffraction; D011208:Powders; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D008674:Metals, Rare Earth; D011208:Powders