Hsu C.-H.Liaw C.-L.Lu C.-H.2019-05-132019-05-13201009258388https://scholars.lib.ntu.edu.tw/handle/123456789/407430Monophasic Sr2(Ce1-xSnx)O4 phosphors (x = 0-0.07) were prepared via the sol-gel process. A broad excitation band ascribed to the Ce4+-O2- transition was observed in the range of 200-450 nm. With doping Sn4+ ions into the host, the intensity of the low-energy peak enhanced remarkably due to a decrease in crystal field. The intensity ratio of the low-energy peak to the high-energy peak increased with the amount of Sn4+ ions doped. Moreover, the red shift of the excitation peaks was observed due to an increase in the bond length of Ce-O. Upon excitation at around 346 nm, the intensity of the blue emission peak peaking at 483 nm was enhanced with doping Sn4+ ions. The doping of tin ions was found to significantly improve the luminescence characteristics of the prepared phosphors when they were excited under UV light. ? 2009 Elsevier B.V. All rights reserved.LEDLuminescenceSn4+ ionSol-gelSr2CeO4[SDGs]SDG7journal article10.1016/j.jallcom.2009.06.1542-s2.0-70649108737https://www.scopus.com/inward/record.uri?eid=2-s2.0-70649108737&doi=10.1016%2fj.jallcom.2009.06.154&partnerID=40&md5=63bea60e8d49cef44d961d707e8e294d