Abstract
A novel deep-red emitting phosphor K0.5La0.5SrMgWO6: Mn4+ has been designed by A-site multi cations substitution strategy. The K0.5La0.5SrMgWO6: 1.5%Mn4+ emits red luminescence peaking at 695 nm under NUV/Blue light excitation and exhibits outstanding quantum efficiency (IQE=92.4%, EQE=72.5%), which is comparable to the commercial red fluoride phosphor K2SiF6: Mn4+. It is believed that three different cations K+, Sr2+ and La3+ in the matrix tilt and distort the [WO6] and [MgO6] octahedrons, resulting in the enhancement of oscillator strength of transition for Mn4+ ions doped into the W6+ and Mg2+ sites and the reduction of concentration quenching induced by the energy transfer between Mn4+ ions. The K0.5La0.5SrMgWO6: Mn4+ phosphor might provide application in plant cultivation LEDs and the related investigation also refers an effective way to improve Mn4+ activated perovskite phosphor.
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