Tunable multicolor and bright white emission in PEG modified β-NaGdF nanocrystals by systematic introduction of Ce and Mn/Ln.

In this paper, Mn/Ln-doped hexagonal phase (β-) NaGdF:Ce (Ln = Tb, Dy, Eu) nanomaterials with subtly tuned multicolor output have been successfully synthesized by a typical simple hydrothermal method using polyethylene glycol (PEG) as a surface modifying agent. The crystal structures, morphology, luminescence performance, and energy transfer (ET) mechanism of the synthesized NaGdF nanoparticles (NPs) were investigated in detail. It is found that due to the effective ET between Ce and Mn/Ln, the multicolor down-conversion (DC) emission phosphors can yield three major emission bands in the visible region including blue, green and red.

The effect of carbon-polyaniline hybrid coating on high-temperature electrochemical performance of perovskite-type oxide LaFeO3 for MH-Ni batteries.

An efficient carbon-polyaniline (PANI)-coated method was applied for perovskite-type oxide LaFeO3 to enhance its high-temperature electrochemical performance. Transmission electron microscopy (TEM) results reveal that LaFeO3 particles are evenly coated with carbon and PANI hybrid layers after carbon-PANI treatment. The carbon layers prevent the nanosized LaFeO3 particles from aggregation and allow the electrolyte to penetrate in every direction inside the particles.