In situ chemical coprecipitation composition of hybrid precursors to synthesize YP xV 1− xO 4:Eu 3+ micron crystalline phosphors

Abstract

In the context, a novel synthesis technology was applied to YP x V 1− x O 4:Eu 3+ phosphors. Among rare earth coordination polymers with aromatic carboxylic acids were used as the precursors of rare earth oxide components, and polyethylene glycol (PEG) and different molar ratio of ammonium vanadate (NH 4VO 3) and ammonium primary phosphate (NH 4H 2PO 4) were composed to assemble inorganic/organic hybrid polymeric dispersing media by an in situ chemical coprecipitation process. After the heat-treatment of the resulting multicomponent hybrid precursors at 1100 °C, YP x V 1− x O 4:Eu 3+ phosphors were achieved. Both XRD and SEM indicated the particles present good crystalline state, whose crystalline grain sizes were in the range of around 0.5–1 μm. The excitation spectra show a brand spectral band in narrow ultraviolet region of 200–280 nm, while no apparent absorption appears in long-wavelengths region of 280–400 nm. The corresponding emission spectra indicate that these crystalline phosphors exhibit very strong red emission of the characteristic transitions of Eu 3+ ( 5D 0 → 7F 2). This technology can be expected to apply to prepare high efficient micron rare earth oxylates (vanadates, phosphates or their complex phosphors) for practical development in luminescent materials and devices.