Font Size: a A A

Preparation And Characterization Of Red Rare-earth Luminescent Material Y2O3:Eu3+

Posted on:2012-06-12Degree:MasterType:Thesis
Country:ChinaCandidate:H SuFull Text:PDF
GTID:2181330467477986Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
Tri-phosphor fluorescent powder is the important component of rare earth luminescence materials, which consists of rare-earth phosphorus with red, green, blue luminescence. The red Y2O3:Eu3+not only has a high quantum efficiency of close to100%, but also has a better color purity, optical decay characteristics, and appropriate emission wavelength. The red Y2O3:Eu3+has long been used in color television picture tubes and trichromatic fluorescent lamps.It has a wide range of market applications. But at present, the preparation methods of Y2O3:Eu3+has some promblems, such as long time, high energy consumption, easy to join and so on. To overcome these problems, explore a new preparation method is becoming searching spot. The preparation of high-temperature energy ball milling method which was built on top of conventional mechanical ball milling techniques was investigated in this paper. It could be seen that the experimental process was simple, energy saving, innovative. The luminescent material Y2O3:Eu3+was prepared by chemical precipitation method and high temperature-energy ball milling method.In the chemical precipitation method, a series of luminescent material Y2O3:Eu3+were prepared by chemical precipitation method through changing some factors, such as precipitation pH value, precipitation temperature, sintering temperature, doping amount of Eu3+, etc., and then, the prepared materials are characterized by some measures, such as XRD、FL and SEM. At the same time, in the high temperature-energy ball milling method, the factors of high temperature-energy ball milling were studied, such as ratio of milling media to material, ball milling temperature, ball milling time, doping amount of Eu3+, etc., XRD、FL and SEM were employed to characterized the powders. For this, we aim at obtaining the optimal preparing technology factors of the luminescent material Y2O3:Eu3+Experimental results are obtained as follows:firstly, the strongest luminescent Y2O3:11%Eu3+powder with well crystallized is prepared in a muffle at800℃of sintering temperature for2hours from a precursor which is prepared at3of precipitation pH value and 50℃of precipitation temperature; secondly, the strongest luminescent Y2O3:12%Eu3+powder with proper and uniform particle size is prepared by a high energy ball milling method at600℃for3h from the precursor which is prepared at3of precipitation pH value and50℃of precipitation temperature, and the ratio of milling media to material is15:1; thirdly, both chemical precipitation method and high temperature-energy ball milling method have their advantages, powder prepared by chemical precipitation method is relatively high luminous intensity; compared with the chemical precipitation method, synthesis temperature of high temperature-energy ball milling method even lower, the high temperature-energy ball milling method can be used for lowing the synthesis temperature of the luminescent material Y2O3:Eu3+from800℃to600℃, and rising the doping amount of Eu3+from11%to12%. At the same time, uniformly dispersed luminescent powder particles without glomeration are obtained.
Keywords/Search Tags:Y2O3:Eu3+, Luminescent materials, Chemical precipitation method, High temperature-energy ball milling method
PDF Full Text Request
Related items