title: Synthesis and photoluminescence properties of red emitting phosphor La2-xEuxLi0.5Al0.5O4[x = 0.2-2] with K2NiF4structure.
abstract: Europium (Eu)3+-substituted La2Li0.5Al0.5O4red emitting phosphors were prepared by a conventional high-temperature solid-state reaction method. Powder X-ray diffraction, diffuse reflectance spectra and spectrofluorometry were used as vital characterizing tools for the phosphors. The Eu concentration dependence luminescence properties and Judd-Ofelt intensity parameters were investigated and calculated, respectively. All compositions showed an orange red emission (due to the magnetic and electric dipole transitions of the Eu3+ion) with the appropriate Commission Internationale de l'Eclairage (CIE) colour gamut under near ultraviolet or blue ray light excitation. The calculated critical distance showed that the energy transfer occured between Eu to Eu via an exchange mechanism. The Eu1.4La0.6Li0.5Al0.5O4composition showed the highest red emission intensity with CIE colour saturation compared with that of the commercial Eu-activated yttrium oxysulfide red phosphor.
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, India.
authors.forename: S
authors.initials: S
authors.lastname: Kasturi
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, India.
authors.forename: S
authors.initials: S
authors.lastname: Satish Kumar
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, India.
authors.forename: V
authors.initials: V
authors.lastname: Sivakumar
mesh_terms: D003116:Color; D003460:Crystallization; D005063:Europium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry; D008094:Lithium / Q000737:chemistry; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements; D015394:Molecular Structure; D014961:X-Ray Diffraction
chemical_list: D049408:Luminescent Agents; D005063:Europium; D007811:Lanthanum; D008094:Lithium
keywords: Eu3+ luminescence; K2NiF4 structure; red phosphor; white LEDs