title: Luminescence properties of Eu(3)(+)-doped Na3Gd(PO4)2 red-emitting nanophosphors for LEDs.
abstract: Eu(3+)-doped Na3Gd(PO4)2 phosphors were synthesized by the modified citrate gel combustion technique. From the XRD pattern, structure of the compound was found to be orthorhombic with a particle size of 10-20nm. The emission spectra revealed that the Na3Gd(PO4)2:Eu(3+) phosphors can be excited effectively by 394nm pump wavelength. From the concentration dependent photoluminescence studies, the optimum concentration for efficient luminescence of Eu(3+) ions in Na3Gd(PO4)2 phosphor has been found to be 1.5mol%. Decay curves of the (5)D0 level of Eu(3+) ions were recorded by monitoring the emission at 596nm corresponding to (5)D0→(7)F1 transition and are found to be single exponential for all the concentrations. The chromaticity properties for different concentrations of Na3Gd(PO4)2:Eu(3+) nanophosphors were calculated from emission spectra and analyzed in the frame work of CIE color diagram.
authors: Department of Physics, Sri Venkateswara University, Tirupati 517 502, India.
authors: T
authors: T
authors: Chengaiah
authors: Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, University Campus, 3810-193 Aveiro, Portugal.
authors: B C
authors: BC
authors: Jamalaiah
authors: Department of Physics, Sri Venkateswara University, Tirupati 517 502, India; Department of Physics, Chadalawada Ramanamma Engineering College, Renigunta Road, Tirupati 517 506, India. Electronic address: lrmphysics@yahoo.co.in.
authors: L
authors: L
authors: Rama Moorthy
mesh_terms: D002412:Cations / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D010710:Phosphates / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry
chemical_list: D002412:Cations; D049408:Luminescent Agents; D010710:Phosphates; D005063:Europium; D012964:Sodium; D005682:Gadolinium
keywords: Eu(2)O(3); Lifetime; Luminescence; Phosphate phosphor; Red light emission