PbMoO4:Eu3+ red phosphor material for potential applications in white light emitting diodes

Abstract

Monophasic PbMoO 4 possessing tetragonal symmetry with varied Eu 3? concentrations is synthesized by solid state reaction method. The samples are characterized by X-ray diffraction, scanning election microscope, energy dispersive spectra, excitation spectra, emission spectra and decay curves. Single cubic phase of PbMoO 4 crystal is confirmed by X-ray diffraction analysis. Analysis of the photoluminescence spectra indicates that the phosphor can be excited by UV light of 386 nm, thus emitting intense red light. The ratio of red emission ( 5 D 0 ? 7 F 2 ) to orange emission ( 5 D 0 ? 7 F 1 ) is very high in present phosphor. This may be due to a lower symmetry of crystal field around Eu 3? ions. The color coordinates are calculated for PbMoO 4 :Eu 3? phosphor located in International Commission on Illumination chromaticity diagram.

Na/Mo co-doped PbTiO3 for photocatalytic water oxidation and Z-scheme overall water splitting under visible light

“…The PbTiO 3 (PTO), Mo doped PTO (PTOM- x ) and Na/Mo co-doped PTO (PTONM- x ) were prepared by the molten salt method ( x refers to the molar percentage of Mo/(Mo + Ti) in raw materials, and the molar ratio of Na/Mo is 1 : 1), 30 and PbMoO 4 (PMO) as a reference was prepared by the reported solid-state method. 31 Due to the similar ionic radius of Mo 6+ and Ti 4+ , Mo 6+ tends to supersede Ti 4+ . 32 In view of the valence state and radii differences of Mo 6+ and Ti 4+ , lead molybdate (PbMoO 4 ) might form during the preparation processes.…”