Combustion Synthesis And Luminescence Properties Of Rare Earth-Doped Aluminate Luminescence Materials

Owning to the properties of high brightness, long afterglow, adjustable wavelengh scale and non-radiation substance, more and more attention is paid to the studies of rare earth-doped luminescence materials. The most newly-introduced luminescence materials are the aluminate luminescence materials activated with rare earth ion, which the domestic and foreign studies of luminescent materials focus on, owning to the superior stability in light, heat and chemistry characteristics of the materials. The rare earth-doped aluminate luminescence materials have very quite wide application in society. At present, there are many studies on the methods of preparation and synthesis of the materials, such as high temperature solid synthesis, sol-gel synthesis, chemical precipitation method, hydrothermal synthesis, microwave synthesis, combustion synthesis and so on. Among all of these methods, the high temperature solid synthesis is the most mature, and it has already been applied in industry. But the disadvantages of high temperature, long time and high expenditure are insurmountable. As a new synthesis method, combustion synthesis shows a bright future to synthesize luminescent materials with advantages of simplification, speediness, economy, low consumption, high efficiency and high quality.In this study, luminescent powders of MAl2O4:Tb~3+ and MAl2O4:Eu2+ (M=Mg,Ca,Sr or Ba) were synthesized by combustion synthesis with raw materials of nitrate and carbamide. The phase, micro-structure and luminescence properties of samples were characterized by X-ray diffraction(XRD) analysis, scanning electron microscopy(SEM) and spectroscopic analysis. By means of experiment, the quantity of solvent of nitric acid and water and combustion-supporting material were ascertained. Atmosphere environment and the ignition temperature of combustion were also ascertained by experiment.As to the luminescent powders of MAl2O4:Tb~3+, the luminescence properties of Tb~3+ in magnesium aluminate, calcium aluminate, strontium aluminate and barium aluminate were studied separately. In addition, the influence of different aluminate to the luminescence properties of Tb~3+ was studied too. The results showed that luminescence of Tb~3+ was attributed to the f-f transition, and the luminescence of Tb~3+ was affected very little by cation radius of alkaline earth and crystalloid environment. The function of Ce3+ to luminescence of Tb~3+ was also probed in the study, and the results revealed sensitizing function of Ce3+ to Tb~3+.As to the luminescent powders of MAl2O4:Eu2+, the luminescence properties of Eu2+ in magnesium aluminate, calcium aluminate, strontium aluminate and barium aluminate were explored separately. As a result, the red luminescence of MgAl2O4:Eu was observed. The influence of different aluminate of calcium, strontium and barium to the luminescence properties of Eu2+ was analyzed through the experiment. The results showed that luminescence of Eu2+ in calcium aluminate, strontium aluminate...