The Research Of Coprecipitation Preparation Sr₂P₂O₇: Eu²⁺/Eu²⁺,Mn²⁺ And Ce_xZr_1-xO₂ Oxide Materials

White LED diode devices have high energy efficiency,friendly environment,long use time and so on,which has LED to the emergence of the lighting industry in the light industry.In today's mainstream market,fluorescent transformed white LED?pc-LED?has great advantages.In pc-LED,the luminescent material is one of the core parts,and the performance of the material used will affect the use of the light-emitting devices.Nowadays,commercially available pc-LED can obtain white light in the following ways:1)use blue chip composite YAG:Ce³⁺yellow luminescent material;2)use?near?UV chips to combine different red,green and blue luminescent materials.In the current environmental problems,the car burning gasoline in the back of the exhaust emission problem,has received the attention of people from all walks of life.Today,the most common and effective way to manage this problem is through the use of three catalytic purification technologies?TWC?.When using three-way catalyst materials,however,due to the catalyst stability,at the same time also can broaden the air-fuel ratio of the work window,and is used in the important auxiliary CeZrO₂research and development is more important.Three-way catalyst under the temperature of 1000?to 1100?operation can effectively reduce CO and NO_x emissions,but at high temperatures,cerium zirconium composite oxide because of its easy to sintering properties,will lead to the sample oxygen storage performance and specific surface area of slash,ultimately affect the TWC catalyst,leading to the activity decreased.The main work of this paper is:adopting coprecipitation method,and carefully studying the effects of different conditions on the preparation of coprecipitation,so as to explore the applicationofcoprecipitation.ForthenearUVLEDmaterialpyrophosphate Sr₂P₂O₇:Eu²⁺/Eu²⁺,Mn²⁺was improved to study the crystal structure refinement of the obtained samples;The morphology of the samples was studied by SEM.Test the luminescence performance of the sample.For Tianjin HaiSai company project requirements,by changing the coprecipitation preparation conditions to study the cerium zirconium composite oxide specific surface area,pore volume and pore diameter,ultimately to achieve a goal.The main results are as follows:1.Using co-precipitation method,Eu²⁺/Eu²⁺,Mn²⁺doped Sr₂P₂O₇were synthesized,and the effects of morphology on samples were studied by means of XRD,scanning map,excitation emission spectra and color coordinates.Studies have shown that Sr₂P₂O₇:Eu²⁺can be fired at421nm with the excitation of 345nm;Sr₂P₂O₇:Eu²⁺,Mn²⁺by excitation under 355 nm can be located in the two different intensity of 420 nm and 578 nm emission peak,after doped with different concentrations of Mn²⁺can regulate Sr₂P₂O₇:Eu²⁺,Mn²⁺sample from blue to white light range so that it can launch.After changing the mixing temperature of the prepared sample,different morphology can be obtained.Under the mixing temperature of 100?got stick Sr₂P₂O₇:Eu²⁺samples,concurrent now under the rules of the columnar morphology has the largest emission intensity.Then,studied the doping concentration of Mn²⁺for Sr₂P₂O₇:Eu²⁺,Mn²⁺sample,the influence of through the analysis of scanning electron microscopy?SEM?map shows that adding Mn²⁺concentration,self-assembly phenomenon in a sample,by original gradually polymerization into a round stick.2.By studying the synthesis process of Ce ZrO₂,the specific surface area,pore volume and pore diameter of the samples were improved.After studying the aging time,doped ions,sintering temperature and ratio of cerium zirconium conditions found that prolong the aging time and improve the sintering temperature,reduce the sintering temperature and doping certain ions can improve the specific surface area of the sample.Finally got Ce_0.45Zr_0.4O₂:0.05Nd,the optimal sample 0.1Y.After testing the sample,the specific surface area was 104.3198m²/g,the pore volume was 0.289687cm³/g,and the aperture was 11.10765nm,which was more consistent with the demand sample data.