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Open AccessArticle

Photoluminescence Property of Eu3+ doped CaSiO3 Nano-phosphor with Controlled Grain Size

SeedNanoTech and Consulting, Brampton, ON L6Y 3J6, Canada
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Author to whom correspondence should be addressed.
Present address: GEM System Inc., Markham, ON L3R 5H6, Canada.
Colloids Interfaces 2018, 2(4), 52; https://doi.org/10.3390/colloids2040052
Received: 18 September 2018 / Revised: 26 October 2018 / Accepted: 26 October 2018 / Published: 28 October 2018
A series of Eu3+ doped CaSiO3/SiO2 nano-phosphor powder of controlled grain size, crystalline structure, and chemical composition were synthesized using the microemulsion technique. The morphology, size, and shape of the synthesized nanophosphorous powder were investigated using transmission electron microscopy and X-ray diffraction (XRD) analysis. XRD profiles of samples sintered over 600 °C, suggested phase shift from amorphous powder grain to more ordered polycrystalline powder of triclinic type wollastonite, CaSiO3, with preferred crystal phase orientation of (112) and tetragonal type cristobalites of SiO2. The grain size, crystallinity, and chemical composition of the host matrix, activator and sensitizer strongly affected both the absorption and emission bands of these samples. The amplitude of both the orange and red emission bands significantly increased with sintering temperature. The emission band is red-shifted with decreasing grain sizes. These bands displayed good sensitivity to ionic concentration of the Si4+, Ca2+, and Eu3+. With increasing Ca2+ ion concentration both the intensity of the red photoluminescence (PL) band increased and a concentration quenching observed. Increase in Si4+ ion concentration led to quenching in PL intensity of both the orange and red bands, whereas the amplitude of the blue-band slightly increased. With increasing Eu3+ ion concentration the red-band initially increased whereas it started decreasing at higher sample concentration. In the presence of Ca2+ ion as a sensitizer, the sample showed a remarkable PL property-including–about 100% photon conversion efficiency and a two-fold increase in excitation and emission photons. View Full-Text
Keywords: polycrystalline nanophosphor; photoluminescence; Eu3+ doped CaSiO3; microemulsion technique polycrystalline nanophosphor; photoluminescence; Eu3+ doped CaSiO3; microemulsion technique
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Niraula, B.B.; Rizal, C. Photoluminescence Property of Eu3+ doped CaSiO3 Nano-phosphor with Controlled Grain Size. Colloids Interfaces 2018, 2, 52.

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