Synthesis of SrTiO3:Eu,Al Nanophosphors by High-energy Ball Milling

Synthesis of SrTiO3:Eu,Al Nanophosphors by High-energy Ball Milling
Nanoparticles; Ball-milling; phosphor; SrTiO3
Issue Date
2010 international symposium on crystal crowth
Strontium titanate (SrTiO3) is a well-known perovskite material and its optical bandgap is 3.3 eV.1 Since strontium titanate is chemically very stable, it is considered as a good candidate for host materials for cathodoluminescent phosphors in field emission display (FED) and vacuum fluorescence display (VFD).2 For its phosphor applications, its particle morphology and size are an important issue. There are many reports in strontium titanate synthesis such as solid state reaction3, ultrasonic pyrolysis4, and sol-gel solution method5. It is, however, difficult to obtain a monolithic SrTiO3 phase at relatively low temperature (< 1000oC) and also control its particle size at the nanometer scale. In this study, we would like to present the synthesis of strontium titanate nanophosphors by high-energy ball milling. Here, we utilized titania nanopowders (~20 nm) as a titanium precursor and SrCO3 as strontium source. In addition, we doped Eu3+ as an activator and Al+ as a luminescence enhancer into the SrTiO3 host. The red-emitting nanophosphors (<100 nm) were obtained after milling for several hours and then firing at 850oC for 4 h (Fig. 1).
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