Effects of pH Values on the Structure, Composition and Luminescence of CaWO4∶Tb3+ Thin Films
It is hardly possible to obtain rare earth doped CaWO4 thin films directly through electrochemical techniques.A two-step method has been proposed to synthesize Tb3+-doped CaWO4 thin films.X-ray diffraction,energy dispersive X-ray analysis,spectrophotometer were used to characterize their phase,composition and luminescent properties.Results reveal that Tb3+-doped CaWO4 films have a tetragonal phase.The ratio of n(Tb)/n(Ca)+n(Tb)+n(Na) decreases with the increase of pH value of TbCl3 solutions.When the pH value (adjusted by NaOH) is higher than 5,Na element has been detected in CaWO4∶Tb3+ thin films.Based on the analysis on the composition and luminescence,it can be concluded that the pH value of TbCl3 solutions must be no higher than 9.1,otherwise,no Tb3+-doped CaWO4 thin films can be obtained.Under the excitation of 237 nm,sharp emission peaks at 543 and 489 nm have been observed for Tb3+-doped CaWO4∶Tb3+ thin films.
pH doping Tb3+ CaWO4 thin film
Lian Ping Chen Yuan Hong Gao
School of Materials Science and Engineering, Jiangxi University of Science and Technology, 86 Red Fl School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Techn
国际会议
广州
英文
204-207
2012-11-16（万方平台首次上网日期，不代表论文的发表时间）