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A novel red-emitting phosphor Mg2Al4Si5O18:Mn4+ is successfully synthesized using a solid-state reaction method. Aluminosilicate Mg2Al4Si5O18 of low-symmetry orthorhombic phase contains abundant octahedrons and is suitable for Mn4+ doping. A broad absorption band ranging from 240 nm to 550 nm in the ultraviolet–visible spectra corresponds to the photoluminescence excitation spectrum. The emission...
A novel phosphor, Sr2LaNbO6:Mn4+, is synthesized by conventional solid-state reaction. The phosphor can be excited at 300–500nm and emit a deep-red light. An emission band peak of 694nm is observed from the spin-forbidden transition 2E→4A2 of Mn4+ ions. Energy transfer between the Mn4+–Mn4+ pairs decreases fluorescence decay time from 0.815ms to 0.512ms. The resistance of luminescence against thermal...
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