Hydrothermal synthesis and luminescence of CaMO{sub 4}:RE{sup 3+} (M=W, Mo; RE=Eu, Tb) submicro-phosphors
- Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092 (China)
Submicrometer crystalline CaMO{sub 4}:RE{sup 3+} (M=W, Mo; RE=Eu, Tb) phosphors with a sheelite structure have been synthesized via the hydrothermal process, which were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray-excited luminescence (XEL), UV-vis diffuse reflectance spectra (UV-vis DRS) and scanning electron microscopy (SEM), respectively. The XRD patterns show that both CaWO{sub 4} and CaMoO{sub 4} have the same structure with space group I41/a. The SEM images indicate that the optimal hydrothermal temperature is 120 deg. C for the particles that aggregate with the increase of temperature. The bands ranging from 380 to 510 nm in the XEL spectra of CaWO{sub 4}:Eu{sup 3+} can be attributed to the charge transfer state from the excited 2p orbits of O{sup 2-} to the empty orbits of the central W{sup 6+} of the tungstate groups. The comparison between photoluminescent lifetimes and quantum efficiencies of the two phosphors was also investigated in detail. - Graphical abstract: Submicro-crystalline Eu{sup 3+}-activated tungstate CaWO{sub 4}:RE{sup 3+} phosphors with a sheelite structure have been synthesized via the hydrothermal process; the morphology was determined from the hydrothermal temperature. Scanning electron microscopy (SEM) images show that CaWO{sub 4}:Eu{sup 3+} exhibits spherical particles, which can be controlled by the reaction parameters.
- OSTI ID:
- 21128257
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.01.033; PII: S0022-4596(08)00062-5; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM TUNGSTATES
EUROPIUM COMPOUNDS
EUROPIUM IONS
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
MOLYBDATES
OXYGEN IONS
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
SCANNING ELECTRON MICROSCOPY
SPACE GROUPS
TERBIUM COMPOUNDS
TUNGSTEN IONS
X RADIATION
X-RAY DIFFRACTION