Luminescence of the near‐ultraviolet blue‐emitting Ba 9 Al 2 Si 6 O 24 :Ce 3+ phosphor

A near‐ultraviolet (NUV) blue‐emitting phosphor Ba 9 Al 2 Si 6 O 24 :Ce 3+ (BAS:Ce 3+ ) was synthesized using a high‐temperature solid‐state reaction. BAS:Ce 3+ had an excitation band peak at about 328 nm and showed a blue emission band. The NUV‐blue emission band had a peak at about 386 nm with a band width of about 60 nm, attributed to the 5d–4f transition of Ce 3+ . Fluorescent decay showed an exponential model with a lifetime of 27.2 nsec. At 150°C, the luminescence intensity decreased to 68.7% compared with the intensity at room temperature.