Abstract
Novel LiGaTiO4:Mn4+ and LiGaTiO4:Mn4+, R (R=Mg2+ and Al3+) phosphors are synthesized by solid-state reaction method in air. Emission spectra of LiGaTiO4:Mn4+ phosphor with excitation 330, 395, and 470nm contain three emission bands peaking at ~668, 680, and 696nm in the range of 610–800nm, and excitation spectrum monitored at 668nm contains broad excitation band with three excitation peaks located at ~330, 395, and 480nm within the range 250–600nm, which indicate that LiGaTiO4:Mn4+ phosphors can be effectively excited by ultraviolet, near ultraviolet, and blue light-emitting diode chips. The optimal Mn4+ doping concentration is ~0.6mol% in LiGaTiO4:Mn4+ phosphor. Time resolved luminescence spectra and these lifetime data indicate that it is only a single type of Mn4+ ion luminescent center in LiGaTiO4:Mn4+ phosphor. Emission intensity of LiGaTiO4:Mn4+ phosphor may be enhanced 1.3–2.2 times by co-doping Mg2+ and Al3+ ions. The luminous mechanism of Mn4+ ion is analyzed by Tanabe-Sugano energy diagram and configurational coordinate diagram.
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