Luminescent Properties of Y2O3： Eu Nanocrystalls Synthesized by EDTA Complexing Sol-Gel Process

Y2O3: Eu nanocrystals were synthesized by EDTA complexing sol-gel process at a relatively low temperature, in which ethylen-diamine-tetraacetic acid (EDTA) and polyethylene glycol (PEG) were used as the chelating agent and polymerization agent respectively. Formation process of Y2O3:Eu and structure characterization were carried out by TG-DTA, XRD, SEM/EDX. The results show that pure cubic phase Y203: Eu nanocrystalsere is produced after the precursor calcinated at 600℃ for 2 h, and the crystallinity increases with increasing calcination temperature. The nanoparticles of the Y2O3: Eu are basically spherical in shape. The mean particle size increases from about 30 to 70 nm when the calcination temperature increases from 600 to 1000℃. The luminescent properties of phosphor were analyzed by measuring the excitation and emission spectra. The main emission peak of the sample is around 612 nm, resulting in a red emission. The emission intensity increases with the calcination temperature. Compared with microsized Y2O3: Eu phosphors prepared by a conventional method, nanosized Y2O3: Eu synthesized by the present work, gives and a clear red shift in the emission spectrum. Moreover, the quenching concentration of Eu is raised.     

Luminescent Properties of Y_2O_3∶Eu Nanocrystalls Synthesized by EDTA Complexing Sol-Gel Process

Ｎａｎｏｐａｒｔｉｃｌｅｓａｎｄｎａｎｏｃｌｕｓｔｅｒｍａｔｅｒｉａｌｓａｒｅａｎｅｗｃｌａｓｓｏｆａｄｖａｎｃｅｄｍａｔｅｒｉａｌｓｅｘｈｉｂｉｔ ｉｎｇｕｎｉｑｕｅｃｈｅｍｉｃａｌａｎｄｐｈｙｓｉｃａｌｐｒｏｐｅｒｔｉｅｓｃｏｍｐａｒｅｄｔｏｔｈｏｓｅｏｆｔｈｅｉｒｂｕｌｋｍａｔｅｒｉａｌｓ[1 ] .Ｙ2 Ｏ3 :Ｅｕｉｓａｎｅｆｆｉｃｉｅｎｔｒｅｄ ｅｍｉｓｓｉｏｎｐｈｏｓｐｈｏｒｗｈｉｃｈｈａｓｂｅｅｎｕｓｅｄｉｎｆｌｕｏｒｅｓｃｅｎｔｌｉｇｈｔｓ (ＦＬ)ａｎｄｃａｔｈｏｄｅｒａｙｔｕｂｅ (ＣＲＴｓ…     

节能环保型重油乳化技术的研究开发

以不同种类的乳化剂复配制成节能环保型乳化剂,考察了不同条件对重油乳化效果的影响。结果表明:加水量为15%,乳化剂的加入量为0.5%,乳化温度80℃,乳化时间30 min为较佳乳化条件,所得乳化重油稳定性好、热值高,具有良好的应用前景。     

循环水冷却塔风机节能改造

结合中国海洋石油总公司中捷石化化工有限公司三催化装置循环水冷却塔风机节能改造的应用实例,介绍了循环水泵富余扬程利用的原理,评价了水轮风机取代电动轴流风机的节能效果并指出了其在炼油企业推广的意义.