Study on molten salt synthesis, microstructural determination and white light emitting properties of CoNb2O6:Dy3+ phosphor
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- 作者：Mete Kaan Ekmekç ; ia ; mekmekci@marmara.edu.tr" class="auth_mail" title="E-mail the corresponding author ; Mustafa İlhanb ; Lü ; tfiye Feray Gü ; leryü ; zc ; Ayhan Mergenb
- 关键词：Cobalt niobate ; XRD ; SEM-EDS ; Optical properties ; White LEDs
- 刊名：Optik - International Journal for Light and Electron Optics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：128
- 期：Complete
- 页码：26-33
- 全文大小：2182 K
文摘
Undoped, 0.5, 3 and 6 mol% Dy3+ doped CoNb2O6 powders have been prepared by molten salt method using cobalt nitrate hexa hydrate, niobium oxide, dysprosium oxide and Li2SO4
Na2SO4 salt mixture as a flux at 800 °C for 4 h. X-ray diffraction patterns of the undoped, 0.5 and 3 mol% doped CoNb2O6 samples exhibited a single orthorhombic columbite phase, while 6 mol% Dy3+ doped powder showed minor phase. SEM-EDS results coonfirmed XRD findings and revealed smaller grain size by increasing Dy3+ concentration. Structural and luminescence properties of Dy3+ doped samples in UV–vis spectral region were studied. The emissions increased with increasing doping concentration up to 3 mol%, and then decreased due to concentration quenching effect. The color chromaticity temperature (CCT) data of all samples have been estimated in white light region and color of light appear close to yellowish-green.
Na2SO4 salt mixture as a flux at 800 °C for 4 h. X-ray diffraction patterns of the undoped, 0.5 and 3 mol% doped CoNb2O6 samples exhibited a single orthorhombic columbite phase, while 6 mol% Dy3+ doped powder showed minor phase. SEM-EDS results coonfirmed XRD findings and revealed smaller grain size by increasing Dy3+ concentration. Structural and luminescence properties of Dy3+ doped samples in UV–vis spectral region were studied. The emissions increased with increasing doping concentration up to 3 mol%, and then decreased due to concentration quenching effect. The color chromaticity temperature (CCT) data of all samples have been estimated in white light region and color of light appear close to yellowish-green.