Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

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.

Effective paracetamol sensor activity, thermal barrier coating (TBC), and UV-light-driven photocatalytic studies of ZrxO2:Mg2+(1−x) nanoparticles

“…Thus, these extreme changes in the redox peaks in the CV spectra of MZNPs confirmed their chemical sensor activities in an alkaline medium with concentrations of 1–7 mM. 46,47…”

“…Thus, these extreme changes in the redox peaks in the CV spectra of MZNPs confirmed their chemical sensor activities in an alkaline medium with concentrations of 1-7 mM. 46,47 Similarly, the sensing activity of MZ NPs for eye drops was examined in the potential range of 0.6 to À0.2 V with a scan rate of 30 mV s À1 as shown in Fig. 17.…”

“…The photoluminescence study was employed to measure the efficiency of trapping and the recombination of charge carriers, and it is also a suitable technique for understanding the nature of electron-hole pairs in prepared semiconductor MZNPs. 30,31 Fig. 9a shows the excitation spectrum of synthesized MZNPs (0.05 mol%) with peaks observed at 264 and 283 nm.…”

Structural, electrochemical sensor and photocatalytic activity of combustion synthesized of novel ZnO doped CuO NPs

“…The lowest limit of detection for the created electrode was established to be 1×10 −3 mol l. The diffusioncontrolled activity that was seen within the concentration range is supported by the linear fitting reported in the calibration curve [53].…”

“…The dye solution appears to degrade at a negligibly low rate (4%) when it's in dark. In order to carry out photocatalysis, the dye was then exposed to UV for 120 min [52][53][54].…”