Abstract:

A hydrothermal method was used to synthesize Mn⁴⁺ doped SrGe₄O₉ red phosphor. The crystal structure and luminescent properties of the SrGe₄O₉∶Mn⁴⁺ were characterized by XRD and FS. The SrGe₄O₉∶Mn⁴⁺ phosphor emits red emission at 656 nm due to the ²E₂→⁴A₂transition of Mn⁴⁺. The valence state of Mn was demonstrated by EPR. In addition, the influence of Mn⁴⁺ doping concentration on the luminescent properties of the phosphor was studied and the luminescent properties of the hydrothermally prepared SrGe₄O₉∶Mn⁴⁺ phosphor was compared with those of the control sample prepared from solid state reaction.

Key words: hydrothermal method, red phosphor, SrGe₄O₉∶Mn⁴⁺, spectral properties