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Li 2 MgZrO 4 :Mn 4+ ,Ga 3+ phosphors are synthesized via a conventional high-temperature solid-state reaction. The red emission of Mn 4+ is enhanced 6.68 times and 13.0 times under 352 nm and 468 nm excitation when Ga 3+ ions with a concentration of 40% are introduced into the phosphor. The thermal stability of the phosphor is also slightly improved by Ga 3+ doping. It is believed that the Ga Zr dopants in the Li 2 MgZrO 4 host not only stabilize Mn ions in the 4+ state, but also lower the symmetry of Mn 4+ sites, resulting in the significant improvement of the luminescence performance, especially under blue excitation. The results might provide meaningful reference to seek high-performance Mn 4+ doped oxide phosphors for W-LED applications based on a blue-emitting InGaN chip.

Novel red-emitting phosphor Li2MgZrO4:Mn4+,Ga3+ for warm white LEDs based on blue-emitting chip

Novel red-emitting phosphor Li₂MgZrO₄:Mn⁴⁺,Ga³⁺ for warm white LEDs based on blue-emitting chip