caa a22 4500 445303867 CHVBK 20180317142606.0 cr unu---uuuuu 170323e20100501xx s 000 0 eng 10.1007/s12274-010-1035-z doi (NATIONALLICENCE)springer-10.1007/s12274-010-1035-z One-pot synthesis and strong near-infrared upconversion luminescence of poly(acrylic acid)-functionalized YF3:Yb3+/Er3+ nanocrystals [Elektronische Daten] [Leyu Wang, Yi Zhang, Yanyu Zhu] This paper describes the synthesis of new upconverting luminescent nanoparticles that consist of YF3:Yb3+/Er3+ functionalized with poly(acrylic acid) (PAA). Unlike the upconverting nanocrystals previously reported in the literature that emit visible (blue-green-red) upconversion fluorescence, these as-prepared nanoparticles emit strong near-infrared (NIR, 831 nm) upconversion luminescence under 980 nm excitation. Scanning electron microscopy, transmission electron microscopy, and powder X-ray diffraction were used to characterize the size and composition of the luminescent nanocrystals. Their average diameter was about 50 nm. The presence of the PAA coating was confirmed by infrared spectroscopy. The particles are highly dispersible in aqueous solution due to the presence of carboxylate groups in the PAA coating. By carrying out the synthesis in the absence of PAA, YF3:Yb3+/Er3+ nanorice materials were obtained. These nanorice particles are larger (∼700 nm in length) than the PAA-functionalized nanoparticles and show strong typical visible red (668 nm), rather than NIR (831 nm), upconversion fluorescence. The new PAA-coated luminescent nanoparticles have the pottential be used in a variety of bioanalytical and medical assays involving luminescence detection and fluorescence imaging, especially in vivo fluorescence imaging, due to the deep penetration of NIR radiation. Tsinghua University Press and Springer-Verlag Berlin Heidelberg, 2010 YF3 nanocrystals nationallicence NIR upconverting luminescence nationallicence poly(acrylic acid) nationallicence Wang Leyu State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, China aut Zhang Yi College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo-Biosensing, Anhui Normal University, 241000, Wuhu, China aut Zhu Yanyu College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo-Biosensing, Anhui Normal University, 241000, Wuhu, China aut Nano Research Tsinghua Press 3/5(2010-05-01), 317-325 1998-0124 3:5<317 2010 3 12274 https://doi.org/10.1007/s12274-010-1035-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12274-010-1035-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Leyu State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, China aut NATIONALLICENCE 700 1- Zhang Yi College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo-Biosensing, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Zhu Yanyu College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo-Biosensing, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 773 0- Nano Research Tsinghua Press 3/5(2010-05-01), 317-325 1998-0124 3:5<317 2010 3 12274 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer