Photoluminescence and electron spin resonance study on narrow-band UVB emitting Gd-doped LaPO4 phosphors

Photoluminescence and electron spin resonance study on narrow-band UVB emitting Gd-doped LaPO4 phosphors

A series of trivalent gadolinium (Gd3+) doped lanthanum phosphates (LaPO4) were prepared by the co-precipitation technique with varying concentrations of Gd3+. The structural properties of the prepared phosphor samples were analyzed by X-ray diffraction (XRD) which showed monoclinic structure of LaP...

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Bibliographic Details
Published in:Optik (Stuttgart) Vol. 206; p. 164020
Main Authors: Singh, Vijay, Venkateswara Rao, B. Rupa, Rao, A.S., Rao, J.L., Irfan, Muhammad
Format: Journal Article
Language:English
Published: Elsevier GmbH 01-03-2020
Subjects:
Co-precipitation
ESR
Gd3+ ions
LaPO4
Photoluminescence
XRD
XRD
Gd3+ ions
LaPO4
ESR
Co-precipitation
Photoluminescence
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Summary:A series of trivalent gadolinium (Gd3+) doped lanthanum phosphates (LaPO4) were prepared by the co-precipitation technique with varying concentrations of Gd3+. The structural properties of the prepared phosphor samples were analyzed by X-ray diffraction (XRD) which showed monoclinic structure of LaPO4. The photoluminescence (PL) emission spectra of the Gd3+-doped phosphor excited at 272 nm consists of dominant UVB emissions at 312 nm corresponding to the P7/2→8S7/26 transitions of Gd3+. The electron spin resonance (ESR) spectra of LaPO4:Gd3+ phosphor reveal three significant attributes with effective g-values around 6, 2.8, 2.0 and a feeble characteristic at 4.8 owing primarily to the presence of Gd3+ ions in clustered species.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2019.164020