Mn~(4+)-activated Mg_2TiO_4∶ Mn~(4+)red phosphor was prepared by the solid-state reaction,and its structure and luminescent properties were investigated in detail. This phosphor with a broad excitation band in UV and blue light regions shares an intense red emission at 660 nm,which is due to the 2 E2→ 4 A2 transitions of Mn~(4+). The optimized sample was obtained by adjusting the concentration of Mn~(4+). Finally,the warm light-emitting diode was obtained by coating optimized Mg_2TiO_4∶ 0. 002 5 Mn~(4+)with...
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