Abstract
BaWO4:Eu phosphors were prepared by performing a solvothermal reaction in a water–hexane bilayer system. A barium oleate (and europium oleate) complex was obtained in hexane via a phase transfer reaction involving Ba2+ (and Eu3+) ions in an aqueous solution of sodium oleate. The outer surfaces of the nanometer-sized BaWO4:Eu phosphors were capped by the long alkyl chain of oleate; therefore, the hydrophobic nanometer-sized BaWO4:Eu phosphors preferentially dissolved in the hexane layer. The micrometer-sized BaWO4:Eu phosphors were obtained in the water layer. The BaWO4:Eu phosphors prepared in hexane and water yielded sharp strong absorption and emission peaks at 464 and 615nm, respectively, due to the 7F0→5D2 and the 5D0→7F2 transitions of the Eu3+ ions. The BaWO4:Eu phosphors are good candidate red-emitting phosphors for use in InGaN blue-emitting diodes, which have an emission wavelength of 465nm.
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