Structural, photo and thermoluminescence studies of Eu3+ doped orthorhombic YAlO3 nanophosphors

• Published in: Journal of alloys and compounds Vol. 601; pp. 75 - 84
• Main Authors: Premkumar, H.B., Nagabhushana, H., Sharma, S.C., Prashantha, S.C., Nagaswarupa, H.P., Nagabhushana, B.M., Chakradhar, R.P.S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.07.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Eu3; Exact sciences and technology; Nanocrystals and nanoparticles; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Phosphor; Photoluminescence; Physics; Rare-earth; Thermoluminescence; Rare-earth; Eu3; Phosphor; Photoluminescence; Thermoluminescence; Combustion synthesis; Yttrium aluminate; Doping; XRD; Nanoparticles; EU; Europium additions; Line intensity; Energy-level transitions; Transmission electron microscopy; Gamma radiation; Phosphors; Luminescence quenching; Orthorhombic lattices; Kinetics; Dosimetry
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.02.066

Red light emitting YAlO3:Eu3+ phosphor for LED applications. [Display omitted] •YAlO3:Eu3+ phosphors were prepared by low temperature solution combustion technique.•XRD, SEM and FTIR techniques were used to characterize the phosphor.•TL and PL properties were well studied.•Prepared phosphor can be effectively used for making the white LEDs.•The colour purity has been verified by using the CIE diagram. A series of Eu3+ (1–6mol%) activated YAlO3 nanophosphors have been synthesized by a low temperature solution combustion method using ODH fuel. The structural, morphological, thermo and photoluminescent properties are studied. Powder X-ray diffraction patterns indicate that the phosphors are orthorhombic phase of YAlO3 with small traces of Y3Al5O12 phase. Scanning Electron micrographs show the crystallites are fused together to form dumbbell shape. Transmission Electron micrograph shows the crystallites are nano size in the range 30–45nm. Photoluminescence studies of Eu doped YAlO3 showed orange red emission (CIE co-ordinates x=0.645, y=0.353) due to the 5D0→7Fj (j=0, 1, 2, 3, 4) transitions of Eu3+ ions. The concentration quenching occurs at x=5mol%. YAlO3:Eu3+ (5mol%) exhibit two thermoluminescence (TL) glow peaks around 229 and 324°C respectively. TL response with different γ-doses show a good linear response and low fading suggesting that Eu3+ activated YAlO3 is suitable for radiation dosimetry applications. The kinetic parameters (E, b, s) are estimated using peak shape method and discussed in detail.