Crystal Structure and Luminescent Properties of Eu[sup 2+]-Doped Li[sub 2]BaSiO[sub 4] with a Polymorph for White LEDs

The crystal structure and photoluminescence of phosphors were investigated. A preliminary conclusion was reached through X-ray diffraction, Fourier transform infrared absorption, photoluminescent excitation and emission investigations that a polymorph was found. The characterizes an intense blue emission with a peak at 465 nm and a broad excitation band in the UV/visible range. Warm white light with CIE coordinates (0.334, 0.347) and color temperature of about 5500 K is generated by mixing this blue phosphor with the yellow phosphor. These results indicate that with the polymorph of the host would be a promising blue phosphor candidate for UV-chip-based multiphosphor converted white light-emitting diodes (LEDs).