Structural and photoluminescent properties of nanosized BaMgAl10O17:Eu2+ blue-emitting phosphors prepared by sol-gel method. (19th June 2015)

• Record Type: Journal Article
• Authors: Bui, Hao Van; Nguyen, Tu; Nguyen, Manh Cuong; Tran, Trong An; Tien, Ha Le; Tong, Hao Tam; Nguyen, Thi Kim Lien; Pham, Thanh Huy
• Is Part Of: Advances in natural sciences. Volume 6:Number 3(2015)
• Publication Date: 2015-06-19
• Subjects: photoluminescence -- BAM, phosphors -- sol-gel -- nanopowders; 4.02, 4.04, 5.04; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2043-6262/6/3/035013
• Languages: English
• ISSNs: 2043-6254

Abstract

Abstract: We report on the photoluminescent properties of Ba0.9 Eu0.1 MgAl10 O17 (BAM) phosphors in correlation with the host crystalline structures. The phosphors were synthesized by citrate sol-gel process, followed by a sintering and a reduction step, both at elevated temperatures. We found that the phosphors were amorphous when sintered at temperatures below 900 °C. At 1000 °C, the crystalline structure was mainly that of BaAl2 O4 phase. The BaMgAl10 O17 phase appeared at 1100 °C, and became dominant with increasing temperature. At 1300 °C, the BaAl2 O4 phase almost disappeared, and only BaMgAl10 O17 features were found. The luminescent characteristics of the phosphors were closely related to the structures of the host lattice. Under the same reduction conditions, the phosphors sintered at 1000 °C showed the emission of both Eu 3+ and Eu 2+ . For the phosphors sintered at higher temperatures, the main features were originated from the emission of Eu 2+ . We additionally observed the increase of emission intensity and the broadening of emission spectra with increasing reduction temperature.