Enhanced luminescence performances of Sr2YTaO6:Mn4+narrow red

Mn4+ doped oxides as red phosphor have attracted much attention for achieving the white light-emitting-diodes (LEDs) and potential application in plant cultivation LEDs. In the present work, Mn4+ doped double perovskite Sr2YTaO6 phosphor were synthesized using solid-state reaction and XRD patterns for the representative samples revealed its single phase structure. The optical band gaps of Sr2YTaO6 calculated by the diffuse reflectance spectra (3.93 eV) and density functional theory (3.86 eV) were in very good agreement. The photoluminescence excitation spectrum of Sr2YTaO6:0.6%Mn4+ showed two broad bands whose peaks at 415 and 502 nm. The red emission band centered at 683 nm was originated from 2Eg ? 4A2g transition of Mn4+, which matched well with the absorption spectrum of the phytochrome PFR, demonstrating the Sr2YTaO6:0.6%Mn4+ phosphors can be used as the indoor plant growth lighting. The temperature dependent luminescence also analyzed, indicating its good thermal stability. Impressively, Li+/Na+/Mg2+/Ca2+ dopants play an important role in enhancing luminous intensity of Sr2YTaO6:Mn4+ and the mechanisms were systematically studied.