Abstract
Sn4+/Ti4+ co-doped SrGe4O9:Mn4+ deep red phosphors were synthesized via high temperature solid state method. The structure, morphology and photoluminescence properties were investigated by XRD, SEM and fluorescentspectrometer. The obtained samples exhibit strong deep red emission located at 660 nm under 430 nm excitation. The optimum concentration of Mn4+ was about 1.2 mol% and concentration quenching mechanism was related to d-d interaction. Co-doping of Ti4+ (Sn4+) enhanced emission intensity of SrGe4O9 by 22% (13%) due to the changed coordinationenvironment of Mn4+ and efficient energy transfer between Ti4+ (Sn4+) and Mn4+. Sn4+ may be substituted the Ge1 site and Ti4+ replaced the Ge2 site. The fabricated LED showed a white light with chromaticity coordinates (0.3429, 0.2941). The results indicated that site selective occurred and SrGe4O9:Mn4+, Ti4+ (Sn4+) have potential to supplementary red light and package white LEDs.
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