Synthesis of well oil-dispersible BaYF_5:Yb^(3+)/Er^(3+) nanocrystals with green upconversion fluorescence  

作　　者：孙家跃 先建波 夏志国 杜海燕 

机构地区：[1]College of Chemistry and Environmental Engineering,Beijing Technology and Business University [2]School of Materials Sciences and Technology,China University of Geosciences

出　　处：《Journal of Rare Earths》2010年第S1期219-221,共3页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundations of China (20876002,20976002);Natural Science Foundation of Beijing (2082009,2091002);Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality

摘　　要：Nearly monodisperse,regular-shaped and well oil-dispersible tetragonal BaYF5:0.2Yb3+/0.02Er3+ nanocrystals(NCs) were synthesized in water-ethanol-oleic acid-sodium oleate system.The as-obtained NCs exhibited bright upconversion(UC) fluorescence under the 980 nm excitation.Blue(2H9/2-4I15/2),green((2H11/2,4S3/2)-4I15/2) and red(4F9/2-4I15/2) transitions were observed.The results indicated that the relative intensity of green to red increased gradually with increasing power density,which were seldom in the previous work.Therefore,the UC properties and mechanism were studied in detail.Nearly monodisperse,regular-shaped and well oil-dispersible tetragonal BaYF5:0.2Yb3+/0.02Er3+ nanocrystals(NCs) were synthesized in water-ethanol-oleic acid-sodium oleate system.The as-obtained NCs exhibited bright upconversion(UC) fluorescence under the 980 nm excitation.Blue(2H9/2-4I15/2),green((2H11/2,4S3/2)-4I15/2) and red(4F9/2-4I15/2) transitions were observed.The results indicated that the relative intensity of green to red increased gradually with increasing power density,which were seldom in the previous work.Therefore,the UC properties and mechanism were studied in detail.

关 键 词：oil-dispersible NANOCRYSTALS UPCONVERSION rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]