tailieunhanh - Synthesis of BaMgAl10O17: Eu2+ blue phosphor by combustion method

In this report, the experimental results determine the influence of urea concentration and the initiating combustion temperature on luminescent properties and structure of BaMgAl10O17: Eu2+ phosphors prepared by urea - nitrate solution combustion synthesis. | JOURNAL OF SCIENCE, Hue University, Vol. 69, No. 6, 2011 SYNTHESIS OF BaMgAl10O17: Eu2+ BLUE PHOSPHOR BY COMBUSTION METHOD Nguyen Manh Son, Ho Van Tuyen, Pham Nguyen Thuy Trang College of Sciences, Hue University Abstract. Europium ion doped BaMgAl10O17 blue phosphors have been prepared by ureanitrate solution combustion synthesis at 590 0C for 5 minutes. The experimental results of XRD, SEM and photoluminescent spectra showed that the phosphors had hexagonal single phase structure, the average particle size of the powders was about 50 nm and the emission spectra was a broad band with maximum intensity at the wavelength λmax = 455 nm due to transitions from 4f65d1 to the 4f7 electronic configuration of Eu2+ ion. 1 Introduction BaMgAl10O17: Eu2+ blue phosphor has been used extensively in manufacturing tricolor fluorescent lights (FL), field emission displays (FED), plasma display panels (PDPs) and liquid crystal displays (LCD) [1, 2]. Emission spectra of BaMgAl10O17: Eu2+ phosphor was a broad band with peak at 455nm due to transition from the 4f65d excited state to the 4f7 ground state of ion Eu2+. There are many synthesis technologies of this phosphor [3, 4, 5, 6]. Every technology has some advantages. Among them, combustion synthesis has many remarkable advantages as: low heating temperature, short reaction time. However, luminescent properties of materials depend greatly on the technology conditions [2, 7]. For BaMgAl10O17: Eu2+ phosphors prepared by urea nitrate solution combustion synthesis, urea plays the role of fuel just as the reducing agent. Besides, the initiating combustion temperature influences the product. In this report, the experimental results determine the influence of urea concentration and the initiating combustion temperature on luminescent properties and structure of BaMgAl10O17: Eu2+ phosphors prepared by urea - nitrate solution combustion synthesis. 2 Experiments To prepare BaMgAl10O17: Eu2+ phosphors by urea - nitrate solution .