Abstract
Novel Sm3+ doped columbite-type orthorhombic structured MgNb2O6 (MNO) orange-red emitting phosphors were prepared by solution combustion method using ODH as a fuel. The powder phase purity, particle morphology, size, elemental composition, luminescence properties, photocatalytic behaviors and electrochemical studies of prepared samples were studied in detail. Photoluminescence emission spectra of MNO:Sm3+ nanophosphors show all the characteristic emissions of Sm3+ cations corresponds to the transitions 4G5/2 → 6Hj/2(j=5,7,9,11) when excited at 463 nm energy. Among these the strongest emission peak was at 608 nm which corresponds to 4G5/2 → 6H7/2 transition of Sm3+ cations in the host lattice. The luminescence quenching was confirmed by the dipole–dipole interaction among Sm3+ ions. As a result of J-O analysis the branching ratio (~ 58% > 50%) show that the phosphor was highly suitable for color display devices. Photocatalytic activity of MNO:Sm3+ (5 mol%) under UV light shows 99% degradation of AR-88 dye. Electrochemical Impedance Spectroscopy (EIS) confirms the reversibility of the redox reaction, which helps in sensing the presence of paracetamol and alcohol. Thus, MNO:Sm3+ phosphors have great potential applications in display, catalytic, photonic, chemical and thermal sensor applications.
Highlights
Phosphor materials are extensively used in various applications relating to the production of synthetic light for liquid crystal displays, cathode ray tubes, lightemitting diodes, scintillators and many more [1,2,3]
Significant extent of strains were associated with nanoparticles because they are known to have a number of surface atoms which have unsaturated in co-ordinations
Single phase columbite type orthorhombic structured MNO:Sm3+ (1–11 mol%) nanophosphors were prepared in the present work, Transmission Electron Microscopy (TEM) results uphold the nano and polycrystalline nature of the samples, having energy gap in the range of 4 eV as confirmed by diffused reflection spectra (DRS)
Summary
Phosphor materials are extensively used in various applications relating to the production of synthetic light for liquid crystal displays, cathode ray tubes, lightemitting diodes, scintillators and many more [1,2,3]. These phosphor oxide materials have more significant and attained high potential interest to researchers due to their enhanced physico-chemical stability. The materials doped with rare earth ions known as phosphors, used for white light-emitting diodes (wLEDs) are more potential materials and create high interest to the researchers for their luminescent features [10,. In this work, Sm3+ doped MNO with single-phase columbite structure by novel synthetic combustion method has been studied for the first time and it is found to be a potential material for multiple applications
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