Abstract
The crystal structure and photoluminescence of Li 2 BaSiO 4 :Eu 2+ phosphors were investigated. A preliminary conclusion was reached through X-ray diffraction, Fourier transform infrared absorption, photoluminescent excitation and emission investigations that a Li 2 BaSiO 4 polymorph was found. The Li 2 BaSiO 4 :Eu 2+ 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 Li 2 SrSiO 4 :Eu 2+ yellow phosphor. These results indicate that Li 2 BaSiO 4 :Eu 2+ with the polymorph of the host would be a promising blue phosphor candidate for UV-chip-based multiphosphor converted white light-emitting diodes (LEDs).
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