Research On Production And Spectral Properties Of Dy:YbAG And Eu:YbAG

The white light can be obtained through controlling of the proportion of blue light and yellow light which dysprosium(Dy) emit. The europium(Eu) as a kind of three primary colours plays an important role in the realization of the white LED.Therefore, it is of great importance to research Dy3+-doped ytterbium aluminum garnet (Dy:YbAG) phosphor power and Eu3+-doped ytterbium aluminum garnet(Eu:YbAG) phosphor power.Dy:YbAG and Eu:YbAG precursor power are made by low-temperature combustion method and coprecipitation method. The factors of the two methods which include doping concentration, calcine temperature, the pH have been researched.The optimum condition of power made by low-temperature combustion method has been concluded by X-ray diffraction (XRD) and Scanning Electron Microscope(SEM):950℃for the optimum calcining temperature,2h is the most reasonable calcining time, citric acid is the best combustion agent. The best condition of coprecipitation method is that1000℃for the optimum calcining temperature,2h is the most reasonable calcining time, pH=7for the optimum pH.Compared with the standard card of YbAG, the structure of Dy:YbAG and Eu:YbAG is in line with YbAG’s. The strongest absorption peak of Dy:YbAG is founded at357nm, but the strongest absorption peak of Eu:YbAG is founded at393nm. The result shows that the optimum excitation wavelength of Dy:YbAG and Eu:YbAG is357nm and393nm. In the excitation of357nm, the two predominant excitation peaks are founded at481nm and581nm which belong to characteristic emission of Dy3+-ion. In the excitation of393nm, the two predominant excitation peaks are founded at592nm and614nm which belong to characteristic emission of Eu3+-ion.