Production of SrAl2O4:Eu2+, Dy3+ green-emitting phosphor nano-pigment powders via microwave processing route
Abstract
Purpose
The present paper aims to synthesize SrAl2O4:Eu2+, Dy3+ green-emitting phosphor nano-pigment powder using a combination of citrate – gel processing and microwave-assisted heating route.
Design/methodology/approach
Microwave-assisted citrate – gel processing of SrAl2O4:Eu2+, Dy3+ green-emitting phosphor nano-pigment powder has been carried out by varying the pH and the molar ratio of H3Cit/Al3+ + Sr2+ +Eu2++Dy3+ (f/o). X-ray diffraction analysis showed that the produced powders were nearly pure SrAl2O4 phase, in which the SrAl2O4 host phase has the maximum fraction of green-emitting monoclinic SrAl2O4 phase.
Findings
Spectrophotometer results revealed that two excitation peaks appeared at 238 and 339 nm and an emission peak at 515 nm. The crystallite size of the green-emitting phosphor nano-pigment powder was about 37 nm as determined by Scherrer’s formula. The best conditions for formation of monoclinic SrAl2O4 phase with high purity were achieved at pH of precursor solution equal to 7 and the molar ratio of f/o equal to 3.
Originality/value
The present research work for the first time (to the best of the authors’ knowledge) has used microwave and sol–gel combination techniques to produce green-emitting phosphor nano-pigment powder (without using any other heating system).
Keywords
Acknowledgements
The authors would like to thank INSF of Iran Contract Number of 91/sad/23410 in 16/1/2012 for complete financial support provided for this research work. Also, the authors would like to appreciate Mr Omid Khnali for fruitful discussions during practical work of this research project.
Citation
Johari, M., Rajabi, M. and Mohammadi, V. (2017), "Production of SrAl2O4:Eu2+, Dy3+ green-emitting phosphor nano-pigment powders via microwave processing route", Pigment & Resin Technology, Vol. 46 No. 2, pp. 85-91. https://doi.org/10.1108/PRT-07-2015-0064
Publisher
:Emerald Publishing Limited
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