کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1487118 | 1510697 | 2016 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Dual preparation of hydrophobic and hydrophilic BaWO4:Eu phosphors Dual preparation of hydrophobic and hydrophilic BaWO4:Eu phosphors](/preview/png/1487118.png)
• Red-emitting BaWO4:Eu phosphors were prepared in hexane-water bilayer system.
• The hydrophobic nanometer-sized BaWO4:Eu phosphors were obtained in hexane.
• The hydrophilic micrometer-sized BaWO4:Eu dendrites were obtained in water.
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 615 nm, respectively, due to the 7F0 → 5D2 and the 5D0 →7 F2 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 465 nm.
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Journal: Materials Research Bulletin - Volume 78, June 2016, Pages 58–63