Influence of Er super( 3+)/Yb super( 3+) Concentration Ratio on the Down-conversion and Up-conversion Luminescence and Lifetime in GdVO sub( 4):Er super( 3+)/Yb super( 3+) Microcrystals

In this paper, we studied the effects of Er super( 3+)/Yb super( 3+) concentration ratio on structural, morphological and luminescence properties of GdVO sub( 4):Er super( 3+)/Yb super( 3+) green phosphors prepared by a high-temperature solid state method. The samples with different concentrations (...

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Bibliographic Details
Published in:Science of sintering 2015-05, Vol.47 (2), p.221-221
Main Authors: Gavrilovic, T V, Jovanovic, D J, Lojpur, V, Nikolic, A, Dramicanin, M D
Format: Article
Language:English
Subjects:
Electronics
Emission
Erbium
Luminescence
Phosphors
Scanning electron microscopy
Upconversion
X-ray diffraction
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Summary:In this paper, we studied the effects of Er super( 3+)/Yb super( 3+) concentration ratio on structural, morphological and luminescence properties of GdVO sub( 4):Er super( 3+)/Yb super( 3+) green phosphors prepared by a high-temperature solid state method. The samples with different concentrations (between 0.5 to 2 mol%) of dopant Er super( 3+) emitting ions and different concentrations (between 5 to 20 mol%) of sensitizer ions (Yb3+) were studied. The phosphors were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy. For all samples, XRD diffraction patterns confirmed a formation of a pure GdVO sub( 4) phase, while the SEM showed that the materials are comprised of chunks of deformed particles with an average diameter ranging from approximately 2 mu m to 8 mu m. Both, down-conversion and up-conversion emission spectra of GdVO sub( 4):Er super( 3+)/Yb super( 3+) samples, under near UV and IR excitations, exhibit two strong emission bands in the green spectral region at 525 nm and 552 nm wavelengths corresponding to super( 2)H sub( 11/2) arrow right super( 4)I sub( 15/2) and super( 4)S sub( 3/2) arrow right super( 4)I sub( 15/2) electronic transitions of Er super( 3+) ions. The intensity of the green emission was changed by changing the Er super( 3+)/Yb super( 3+) concentration ratio. This dual-mode luminescence makes these materials ideal as green phosphors for a wide variety of applications in the fields of bioanalysis and biomedical.
ISSN:0350-820X
1820-7413