Improvement in Luminescent Characteristics by Al Codoping in Ba2SiS4:Ce Blue Phosphor for White LEDs

Ba2SiS4:Ce has been proposed as a novel blue phosphor for white LED application. It has been found that photoluminescent characteristics are improved by Al-codoping, which realizes a high doping of Ce3+ luminescent centers. The relative PL luminance of 145% has been achieved compared to the commercial BAM under 405-nm-excitation. The internal quantum efficiency is about 36 %. The PL intensity at 150°C maintains about 80% of that at room temperature. It has been also confirmed that Ba2SiS4:Ce is chemically stable enough for applying to white LEDs.