Photoluminescence properties of broadband deep-red-emitting Na2MgAl10O17:Mn4+ phosphor

A new non-rare-earth deep-red-emitting Na 2 MgAl 10 O 17 :Mn 4+ phosphor is prepared successfully by high temperature solid-state reaction method in air. All samples are a single pure phase, which is confirmed by X-ray powder diffractions patterns . Excitation spectrum shows some absorption bands in the range of 220–600 nm, which are line with the wavelength of ultraviolet (UV), near UV, and blue light-emitting diode chips. Deep-red emission of Na 2 MgAl 10 O 17 :Mn 4+ phosphor with excitation UV, near UV, and blue light can be observed in the range of 600–810 nm due to the 2 E → 4 A 2 transition of Mn 4+ ion in octahedral symmetry with aided the lattice vibration . The full width at half maximum (FWHM) is ∼105 nm. The optimal Mn 4+ concentration is ∼1%. Decay curve and time-resolved spectra indicate that there is only a Mn 4+ ion luminescent center in Na 2 MgAl 10 O 17 :Mn 4+ phosphor. The thermal stability is investigated and analyzed by the configuration coordinate diagram of Mn 4+ ion.