Sol-gel synthesis and up-conversion luminescence of GdPO4–Gd3PO7:Yb3+, Ln3+ (Ln = Er, Ho, Tm) phosphor

•GdPO4–Gd3PO7:Yb3+, (Ln3+ = Er, Ho, Tm) by Pechini sol-gel promotes a mixed crystalline phase.•Morphology differences due to the influence of Yb3+ mol% and synthesis route.•Up conversion spectra change significantly as a function of morphology and Yb3 + mol% content.•Yb3+ mol% influences morphology,...

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Bibliographic Details
Published in:Materials letters 2018-09, Vol.226, p.34-37
Main Authors: Rosas Camacho, A., Carrillo Romo, F. de J., García Murillo, A., Oliva, J., García, C.R.
Format: Article
Language:English
Subjects:
Ammonium hydroxide
Ceramics
Conversion coatings
Crystal structure
Crystallinity
Emission
Erbium
Gadolinium compounds
Lanthanide phosphates
Luminescence
Materials science
Monazite
Morphology
Optical properties
Pechini sol-gel
Phosphors
Rare earth phosphates
Sol-gel processes
Synthesis
Up-conversion
Upconversion
Ytterbium
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Summary:•GdPO4–Gd3PO7:Yb3+, (Ln3+ = Er, Ho, Tm) by Pechini sol-gel promotes a mixed crystalline phase.•Morphology differences due to the influence of Yb3+ mol% and synthesis route.•Up conversion spectra change significantly as a function of morphology and Yb3 + mol% content.•Yb3+ mol% influences morphology, emission and chromaticity coordinates of the samples. This work reports the structural, morphological and luminescent properties of GdPO4–Gd3PO7:Yb3+, Ln3+ (Ln = Er, Ho, Tm) phosphors which have been synthesized by Pechini sol-gel process. The XRD patterns indicated that all the samples are crystalline and have a mixture of monoclinic monazite and monoclinic phases. Some samples were synthesized with ammonium hydroxide (NH4OH) and had better crystallinity than these synthesized without NH4OH. The up-conversion emissions were obtained under excitation at 967 nm. According to our results, the color emission was tuned from red to green by increasing the Yb3+ concentration from 5 mol% to 20 mol%. Moreover, the use of NH4OH to synthesize the samples doped with 20 mol% of Yb3+ enhanced their green emission band ≈3 times. The results reveal that doping the GdPO4–Gd3PO7 particles with rare earths produce an up-conversion emission which can be useful for the fabrication of luminescent coatings or lighting devices.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.04.117