Novel red-emitting phosphors of Ca3Y(AlO)3(BO3)4 doped with different concentrations of Mn4+ were successfully synthesized by a high-temperature solid-state reaction method. Crystal composition, microstructure, and luminescence properties of samples were characterized by X-ray diffraction, scanning electron microscope, excitation and emission spectra, decay lifetimes and temperature-dependent photoluminescence spectra. The emission spectra exhibited a strong deep-red emission band in the wavelength range of 625–750 nm with a maximum at 678 nm. The optimal doping concentration of Mn4+ was about 0.1 mol%. Under 325 nm excitation, the CIE chromaticity coordinates of Ca3Y(AlO)3(BO3)4:0.1%Mn4+ sample were (0.704, 0.296). In addition, the concentration quenching mechanism was dominated by a dipole–dipole interaction for the Mn4+ activators. The value of the activation energy Ea was calculated to explain thermal quenching.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: Jun 6, 2018
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