Synthesis of well oil-dispersible BaYF5:Yb3+/Er3+ nanocrystals with green upconversion fluorescence |
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| Authors: | SUN Jiayue XIAN Jianbo XIA Zhiguo DU Haiyan |
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| Affiliation: | 1.College of Chemistry and Environmental Engineering,Beijing Technology and Business University,Beijing 100048,China;2.School of Materials Sciences and Technology,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | 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. |
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| Keywords: | oil-dispersible nanocrystals upconversion rare earths |
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