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Enhanced Red Luminescence and Improved Crystallinity in NaEu(WO4)2 Phosphor: An Electron Beam Irradiation Study

Abstract

Sodium Europium Double Tungstate (NaEuW) red phosphor was synthesized by a facile hydrothermal method and characterized by powder XRD, FTIR, UV-DRS, FESEM and photoluminescent measruements. The influence of different dose of high energy electron beam (EB) irradiation on the structural, morphology and the fluorescence properties of NaEuW crystallizing in the I41/a space group was investigated for the first time in comparison with non irradiated NaEuW. Different dose of high energy EB irradiation resulted in systematic shift in the diffraction peaks towards lower 2Ɵ indicating unit cell volume expansion. Interestingly, phase purity was retained even at higher EB dose signifying the structural stability of NaEuW red phosphor. An insight in to the FESEM micrographs shows improved crystallinity and agglomeration up on EB irradiation. The resultant NaEuW phosphor emit bright red color under UV excitation of wavelength 396 nm and the intensity was significantly vaied for diffferent dose of EB irradiation. At an optimum dose of 20 KGy a very high color purity was obtained from the calculated CIE-X and Y of CIE chromaticity diagram of irradiated NaEuW samples. Additionally, the CIE-X and CIE-Y coordinates of the irradiated material are observed to be closer to the commercially available red phosphor Y2O3S:Eu3+. Hence this work could present a potentially new strategy to improve the fluorescence properties of phase pure NaEuW via EB irradiation.

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Publication details

The article was received on 23 Oct 2017, accepted on 06 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04094F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Enhanced Red Luminescence and Improved Crystallinity in NaEu(WO4)2 Phosphor: An Electron Beam Irradiation Study

    A. K. M, N. Sundaram, J. Dwivedi and V. C. Petwal, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04094F

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