SiO2,MgO-codoped Al2O3−Ce:YAG composite ceramics with different Ce3+ doping concentrations (0.05-0.3 at%) have been fabricated via reactive vacuum sintering, for the purpose of high power white light-emitting diodes (WLEDs). Optical and luminescence characteristics of color converters were investigated by transmittance spectra and photoluminescence examinations. It is found that WLEDs based on synthesized phosphors with 0.05-0.1 at% Ce3+ doping have an optimal balance between high color-rendering index, luminous efficacy and appropriate correlated color temperature values.
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