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Solvothermal synthesis and luminescent properties of hierarchical flowerlike ZnAl2O4:Ho3+ microstructures
Ist Teil von
Optical materials, 2018-10, Vol.84, p.536-544
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Hierarchical microstructures of ZnAl2O4:Ho3+ (0.25–5 mol %) nanophosphors (NPs) were synthesized via solvothermal route using Epigallocatechin gallate (EGCG) as a bio-surfactant. The effect of EGCG concentration on the morphology was studied in detail. The Powder X-ray diffraction (PXRD) studies confirm the cubic phase of the samples. The photoluminescence (PL) emission spectra exhibit peaks at ∼ 540, 553 and 666 nm were due to transitions 5F4→5I8, 5S2→5I8 and 5F5→5I8 of Ho3+ ions, respectively. Thermoluminescence (TL) properties of ZnAl2O4: Ho3+ (0.25–5 mol %) NPs were studied after exposure of 60Co γ-rays at a warming rate of 6 °Cs−1. The TL intensity was found to increase with γ-dose. The kinetic parameters have been determined using Chen's method from the deconvoluted glow curve. The CIE Chromaticity co-ordinates of all the prepared phosphors were located in the blue region. The above results clearly evident that the optimized Ho3+ activated ZnAl2O4 NPs was a promising single phased phosphor for WLED's and dosimetry applications.
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•Hierarchical ZnAl2O4:Ho3+ flower-like structures were prepared by solvothermal route using EGCG surfactant.•Morphologies were highly dependent on surfactant concentration.•Photometric properties apparent that, they exhibit intense blue color with high purity.•The optimized sample was highly useful for radiation dosimetry.