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Title: Synthesis, phase transition and photoluminescence studies on Eu3+-substituted double perovskites-A novel orange-red phosphor for solid-state lighting
Authors: Sivakumar, V.
Varadaraju, U.V.
Keywords: Barium; Calcium; Charge transfer; Electromagnetic waves; Emission spectroscopy; Europium; Gallium alloys; Gallium nitride; Ion exchange; Light; Light emitting diodes; Lithium; Luminescence; Organic light emitting diodes (OLED); Oxide minerals; Perovskite; Phase transitions; Phosphors; Photoluminescence; Reconnaissance aircraft; Semiconducting gallium; X ray analysis; X ray diffraction analysis; Centrosymmetric; Charge transfer bands; Cubic structures; Diffuse reflectance spectroscopies; Double perovskite; Double perovskites; Electric dipoles; Host lattices; Light emitting diode leds; Magnetic dipoles; Orange-red phosphor; Photoluminescence studies; Potential applications; Red phosphors; Relative intensities; White light-emitting diode; White lights; X-ray diffractions; Light emission
Issue Date: 2008
Citation: Journal of Solid State Chemistry, 181(12), 3344-3351
Abstract: Photoluminescence studies on Eu3+-doped double perovskites with the formula A2CaWO6 (A=Sr, Ba) revealed that the forced electric dipole (ED) transition is present when Eu3+ is substituted at the non-centrosymmetric Sr-site vis-a-vis substitution at the centrosymmetric Ca-site shows both ED and magnetic dipole (MD) transition. A series of novel orange-red-emitting phosphor compositions Sr1.9-xBaxEu0.05Li0.05CaWO6 (x=0-1.9) have also been synthesized and characterized by powder X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and photoluminescence. XRD results reveal a phase transition from monoclinic to pseudo-cubic structure for x?0.2. All the compositions show broad charge transfer band and orange-red (MD and ED) emission. However, the relative intensity of the MD and ED depends on the Ba content present in the host lattice. Select compositions in this system of compounds could find potential application as orange-red phosphors for white light generation using blue/near-UV GaN-based light-emitting diodes (LEDs). � 2008 Elsevier Inc. All rights reserved.
ISSN: 224596
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