Near white light emitting ZnAl{sub 2}O{sub 4}:Dy{sup 3+} nanocrystals: Sol–gel synthesis and luminescence studies

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.10.029· OSTI ID:22581421

Kumar, Mithlesh; Gupta, Santosh K.; Kadam, R. M.

Highlights: • ZnAl{sub 2}O{sub 4}:Dy{sup 3+} spinel synthesized using sol–gel method. • Characterized by XRD, SEM and PL spectroscopy. • Investigations of emission, excitation and lifetime properties. • Evaluation of defect centers and trap parameters of the system. • Evaluation of CIE indices of near white light emitting phosphor. - Abstract: ZnAl{sub 2}O{sub 4}:Dy{sup 3+} nanoparticles were synthesized using citrate sol–gel method and characterized systematically using X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. Emission spectrum of pure ZnAl{sub 2}O{sub 4} shows intense violet blue emission under ultra violet irradiation. Based on electron paramagnetic resonance (EPR) results; it was attributed to presence of singly ionized oxygen vacancy centres in ZnAl{sub 2}O{sub 4}. On doping Dy{sup 3+} in ZnAl{sub 2}O{sub 4}, complete host–dopant energy transfer does not take place. Local structural investigation and lifetime measurements reveal that dysprosium ion is distributed between both Zn{sup 2+} and Al{sup 3+} sites. Near white light from ZnAl{sub 2}O{sub 4}:Dy{sup 3+} is attributed to combined host and dopant luminescence. The trap parameters such as activation energy (E) and frequency factor (s) for TSL glow peak 165 °C were determined using different heating rate method. Thermally stimulated emission showed the presence of oxygen related defect centre.

• OSTI ID: 22581421
• Journal Information: Materials Research Bulletin, Vol. 74; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
ALUMINIUM IONS
DOPED MATERIALS
DYSPROSIUM IONS
ELECTRON SPIN RESONANCE
EMISSION SPECTRA
EMISSION SPECTROSCOPY
EXCITATION
NANOPARTICLES
NANOSTRUCTURES
PARAMAGNETISM
PHOTOLUMINESCENCE
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
STIMULATED EMISSION
THERMOLUMINESCENCE
VACANCIES
X-RAY DIFFRACTION
ZINC COMPOUNDS
ZINC IONS