Novel Mn doped red phosphors composed of MgAlO and CaAlO phases for light-emitting diodes.

Red emitters based on CaAlO:Mn have been attracting extensive attention due to their advantages of being rare-earth-free and chemically stable. However, their relatively low luminescence efficiencies will seriously hinder their application in light-emitting diodes (LEDs). In this regard, the promising red phosphors of CaAlO:Mn were synthesized with enhanced luminous efficiency by introducing the coexisting phase of MgAlO.

A far-red emission (Ca,Sr)ZnGaO:Mn phosphor for potential application in plant-growth LEDs.

To facilitate phosphor-converted light-emitting diodes (LEDs) for plant growth, the development of phosphor materials with efficient red or far-red emission is essential. Herein, we report a novel CaSrZnGaO:0.15Mn (CSZG:Mn) phosphor with far-red emission synthesized via the traditional solid-state reaction.

Superhydrophilic and Highly Transparent TiO2 Films Prepared by Dip Coating for Photocatalytic Degradation of Methylene Blue.

Nanocrystalline TiO2 films were prepared on slide glass by sol-gel and dip-coating methods, and the samples were then annealed at 200 °C, 250 °C, 300 °C, 350 °C, 400 °C, 450 °C and 500 °C for 2 h. The samples' crystal structures, morphology, water contact angle, transmission spectra, and photocatalytic performance with respect to the degradation of methylene blue (MB) under UV light irradiation were characterized by X-ray diffraction spectroscopy, scanning electron microscopy, contact angle measurement, and UV-vis spectrophotometry. The results obtained indicate that all of the films were highly transparent to the visible spectrum, but with an increase in the annealing temperature, the optical band-gap and the water contact angle both reduced.

Zn-doped CaTiO3:Eu(3+) red phosphors for enhanced photoluminescence in white LEDs by solid-state reaction.

Zn-doped CaTiO3:Eu(3+) red phosphors for enhanced photoluminescence in white light-emitting diodes (LEDs) were synthesized by a solid-state method. The structure and morphology of the obtained phosphor samples were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the impact of Ca, Zn and Eu content on their photoluminescence properties was studied. The results indicated that Zn not only participates in the formation of defects in suitable lattice matrices but also has a role in flux in the transformation from ZnO to Zn2TiO4, which is beneficial for the enhancement of photoluminescence properties.