Luminescence studies on SrMgAl10O17:Eu, Dy phosphor crystals

✍ Scribed by Tang Wanjun; Chen Donghua; Wu Ming

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 244 KB
• Volume: 41
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2008.03.009

✦ Synopsis

Using urea as fuel, SrMgAl 10 O 17 :Eu, Dy phosphor was prepared by a combustion method. Its luminescence properties under ultraviolet (UV) excitation were investigated. Pure SrMgAl 10 O 17 phase was formed by urea-nitrate solution combustion synthesis at 550 1C. The results indicated that the emission spectra of SrMgAl 10 O 17 :Eu, Dy has one main peak at 460 nm and one shoulder peak near 516 nm, which are ascribed to two different types of luminescent Eu 2+ centers existing in the SrMgAl 10 O 17 matrix crystal. The blue luminescence emission of SrMgAl 10 O 17 :Eu phosphors was improved under UV excitation by codoping Dy 3+ ions. The SrMgAl 10 O 17 :Eu phosphors showed green afterglow (l ¼ 516 nm) when Dy 3+ ions were doped. Dy 3+ ions not only successfully play the role of sensitizer for energy transfer in the system, but also act as trap levels and capture the free holes in the spinel blocks.