title: Synthesis, PL characterizations and concentration quenching effect in Dy(3+) and Eu(3+) activated LiCaBO3 phosphor.
abstract: LiCaBO3 :Dy(3+) /Eu(3+) phosphors were synthesized by a solid-state reaction. The synthesized materials were characterized using powder X-ray diffraction pattern (XRD) for confirmation. All the structural parameters were calculated from the XRD data. Scanning electron microscopy (SEM) images showed rod-like morphology. Photoluminescence (PL) emission spectra showed two emissions (484 and 577 nm) in Dy(3+) -doped LiCaBO3 :Dy(3+) phosphors with the concentration quenching effect and the critical distance was calculated to be about 22.76 Å. LiCaBO3 :Eu(3+) phosphor was effectively excited by a near-UV light of 392 nm. The emission spectra exhibited the transition from (5) D0 level to (7) FJ (J = 0-2) with main emission at 614 nm, which comes from the electrodipole transition because of the asymmetric point group. The quenching concentration of Eu(3+) is about 0.2 mol%, and the critical distance was calculated to be about 38.93 Å.
authors.affiliation: Department of Physics, Kamla Nehru Mavidyalaya, Sakkardara, Nagpur, 440009, India.
authors.forename: V R
authors.initials: VR
authors.lastname: Kharabe
authors.forename: Abha H
authors.initials: AH
authors.lastname: Oza
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
mesh_terms: D001881:Borates / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D004419:Dysprosium / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D018020:Lithium Compounds / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements; D008855:Microscopy, Electron, Scanning; D014961:X-Ray Diffraction
chemical_list: D001881:Borates; D017610:Calcium Compounds; D018020:Lithium Compounds; D049408:Luminescent Agents; D004419:Dysprosium; D005063:Europium; C031316:calcium borate
keywords: PL emission; concentration quenching; critical distance; solid-state reaction