The enhancement of thermal properties of phosphor ceramic plate as sintering aids

Cerium doped Lu₃Al₅O₁₂ phosphor ceramic plate was fabricated by solid state reaction and electric furnace reactive sintering method using commercial Lu₂O₃, α-Al₂O₃, and CeO₂ powders as the starting materials, AlN or Al₂O₃ were used as sintering additives. When Al₂O₃ was used as sintering aid, the optimum dosage was 2 wt%. Although plate optical characteristics was slightly reduced and the difference was very small, whereas the thermal properties exhibited appreciable increase of more than 5%. The excellent feature of using compound additives is to make the intensified liquid sintering begin at a lower temperatures in electric furnace, promoting the densification rate and resulting in uncontaminated crystalline grains.