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Study On The Preparation Of The Strontium Aluminate Fluorescent Glaze

Posted on:2016-10-20Degree:MasterType:Thesis
Country:ChinaCandidate:G L KangFull Text:PDF
GTID:2191330479494049Subject:Materials science
Abstract/Summary:PDF Full Text Request
Strontium aluminate phosphor is one kind of energy storage luminescence material which has many merits like long afterglow, high luminescent intensity, good thermal and chemical stability, non-radioactive hazard, reusable. Fluorescent glaze prepared with strontium aluminate phosphors may be used as functional ink-jet printing ink for the production of luminescent ceramic. Owing to absorbing and storing light energy, the luminescent ceramic can play an important role in architectural decoration, night-vision materials, fire safety and direction sign. In this research, the influence of batch recipes and process parameters to luminescent intensity were studied, which can provide a reference for the research and development of fluorescent glaze.In order to confirm the preparation technique, the advantages and disadvantages of wet and dry processes were compared and investigated. It was found that the glaze prepared by wet process was a whitish porous surface with weak luminescent intensity because strontium aluminate phosphor is apt to be hydrolyzed. Its emission peak shifted from the peak position of the phosphor. Based on these facts, the dry process is more suitable to prepare the glaze.Effects of frit composition and strontium aluminate phosphor content on the luminescent property and surface quality had been studied. The glazes with high content of basic oxide may destroy the phosphor structure and the element calcium will result in emission peak shifting. With the increasing of phosphor content luminescent intensity of the glaze increases and the surface quality decreases. After all, fluorescent glaze with the appropriate kind of frit and about 20 wt% phosphor had a better performance.The frit particle size, glaze thickness, sintering temperature, heating rate and firing atmosphere make great impacts on the luminescent intensity, afterglow decay and surface quality. The author gained the associated parameters of the glaze decay data generated in exponential decay fitting and discussed the mechanism. The reasonable process parameters were determined as: milling time 2 h, glaze thickness 1 mm, fired at 800℃ using the heating rates of 6℃/min(before 600℃) and 10℃/min in the final stage, then cooled naturally in the furnace. The glaze prepared in this way has a high initial brightness above 10 cd/m2 and a long afterglow time. The firing atmosphere has little influence on the glaze performance.Finally, in order to improve the properties of the fluorescent glaze, influences of doping the activator and auxiliary activator in the frit were studied. The results showed that the doping of europium oxide and dysprosium oxide caused concentration quenching effect which resulted in decrease in luminous intensity. The decrease for doping europium oxide was greater than dysprosium oxide. Meanwhile, it also showed that reducing atmosphere could help to improve the performances of sample with addition of dysprosium oxide.
Keywords/Search Tags:SrAl2O4:Eu2+, Dy3+, afterglow decay, fitting parameters, europium oxide and dysprosium oxide, glaze
PDF Full Text Request
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