Sol−Gel-Derived BPO4/Ba2+ as a New Efficient and Environmentally-Friendly Bluish-White Luminescent Material

• DOI: 10.1021/cm052109h
• Publication Date: 2006-01-17T05:48:51Z
• Authors: C. K. Lin; Y. Luo; H. You; Z. Quan; J. Zhang; J. Fang; J. Lin
• Keywords: Chromaticity; Quantum yield

In this paper, BPO4 and Ba2+-doped powder samples were prepared by the sol−gel process using glycerol poly(ethylene glycol) as additives. The structure optical properties of resulting characterized X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), diffuse reflection spectra, photoluminescence (PL) excitation quantum yield, kinetic decay, paramagnetic resonance (EPR), respectively. It was found that undoped showed a weak purple blue (409 nm, lifetime 6.4 ns) due to carbon impurities involved in host lattice. Doping Ba2+ into resulted oxygen-related defects additional centers which enhanced intensity greatly (>10×) shifted longer-wavelength region (λmax = 434 nm; chromaticity coordinates: x 0.174, y 0.187) with bluish-white color. highest obtained when doping 6 mol % BPO4, has yield high 31%. luminescent mechanisms discussed detail according existing models for silica-based materials.