Abstract
We report a new Mg2+, Mn4+ co-doped red-emitting SrLaMgTaO6 phosphor for solid state lighting. The phosphor can be efficiently excited in the wavelength range of 250–500 nm, which matches well with the emission wavelengths of blue or NUV chips. The photo-luminescence spectra exhibit the highest emission peak at 692 nm from 2Eg→4A2 spin forbidden transition of Mn4+ under NUV excitation. The Mg2+ co-dopant for charge compensation plays a key role in enhancing the luminescence intensity by a factor of 2.8. The incorporation of Mg2+ ion in the host could not only suppress the energy migration among Mn4+ ions but also eliminates the charge imbalance in Mn4+ − Mg2+ pairs. W-LED fabrication with different mass ratios of yellow emitting YAG: Ce3+ and red emitting SrLaMgTaO6:Mn4+/Mg2+ phosphors is designed to explore its possible application in warm w-LEDs with high CRI. The w-LEDs fabricated with the integration of SrLaMgTaO6:Mn4+/Mg2+ red phosphor show changing trends toward warm white light with lower color temperature and higher CRI than that based on single yellow emitting YAG:Ce3+ phosphors. The results suggest that SrLaMgTaO6: Mn4+/Mg2+ phosphor has great potential for the warm w-LEDs application as a suitable red light component.
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