title: Influence of calcination temperature on the luminescent properties of Eu³⁺ doped CaAl₄O₇ phosphor prepared by Pechini method.
abstract: Motivated by the need for new phosphor for white light emitting diode (WLED) applications, CaAl₄O₇ phosphors activated by Eu(3+) rare earth ion was synthesized using the Pechini method at different calcination temperatures. The crystal structure and luminescent properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence spectroscopy (PL). The XRD and SEM patterns confirm the presence of a single grossite monoclinic phase (311) and the particles exhibit good crystallinity and the particle size varies with calcination temperature. Absorption peak of FT-IR shows the decomposition of citrate ethylene glycol complex and the formation of CaAl₄O₇:Eu(3+) phosphor. Diffuse reflectance spectra indicate an absorption in the UV-region. The photoluminescence excitation spectrum exhibited a broad band covering from 340 to 420 nm with a sharp band at 395 nm. CaAl₄O₇:Eu(3+) phosphor excited by near UV (395 nm) light showed a strong red emission at 611 nm. The emission band is due to f-f transitions within the 4f(6) configuration of Eu(3+) ions, respectively. The photoluminescence properties were found to be strongly dependent on the calcination temperature and the PL properties are superior for sample calcined at 950 °C.
authors.affiliation: GRD Centre for Materials Research, PSG College of Technology, Coimbatore, India; Department of Physics, PSG College of Technology, Coimbatore, India.
authors.forename: A
authors.initials: A
authors.lastname: Suresh Kumar
authors.affiliation: GRD Centre for Materials Research, PSG College of Technology, Coimbatore, India; Department of Physics, PSG College of Technology, Coimbatore, India. Electronic address: rarunpsgtech@yahoo.com.
authors.forename: R
authors.initials: R
authors.lastname: Arun Kumar
authors.affiliation: Department of Physics, PSG College of Technology, Coimbatore, India.
authors.forename: R
authors.initials: R
authors.lastname: Balasundaraprabhu
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Republic of Korea.
authors.forename: K
authors.initials: K
authors.lastname: Senthil
authors.affiliation: Department of Chemistry, PSG College of Technology, Coimbatore, India.
authors.forename: S
authors.initials: S
authors.lastname: Ramesh Kumar
authors.affiliation: Department of Nanoscience and Technology, Karunya University, Coimbatore, India.
authors.forename: V
authors.initials: V
authors.lastname: Gunasekaran
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry; D060326:Chemistry Techniques, Synthetic; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry; D008163:Luminescent Measurements; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D049408:Luminescent Agents; D005063:Europium
keywords: CaAl(4)O(7); Luminescence; Oxide materials; Pechini method