Water soluble upconversion （UC） luminescence hexagonal-phase NaGdF4： yb3＋/Tm3＋ nanoparticles have been successfully synthesized by the hydrothermal method. XRD, SEM, UC photoluminescence spectra and electron para...Water soluble upconversion （UC） luminescence hexagonal-phase NaGdF4： yb3＋/Tm3＋ nanoparticles have been successfully synthesized by the hydrothermal method. XRD, SEM, UC photoluminescence spectra and electron paramagnetic resonance （EPR） spectrum were used to characterize the nanoparticles. The intensity of UC emission region could be controlled through different sodium source and the fluorine source, 6PJ→8S7/2 emission of Gd3＋ is also observed at 310 nm. A broad spectrum with a dominant resonance at g of about 2 was observed by the EPR spectrum of the NaGdF4：Yb3＋/Tm3＋ nanoparticles. The transparent NaGdF4：yb3＋/Tm3＋ solution presented naked eye-visible violet-blue light under the 980 nm LD excitation. The current work paves the way for their potential application in infrared tomography and magnetic resonance imaging （MRI）.展开更多
以SnCl_4·5H_2O为锡源,以不同氟的化合物如CF_3COOH,HF和SnF_2为氟源,采用溶胶-凝胶-蒸镀法制备不同氟源掺杂的SnO_2(Fluorine-doped Tin Oxide,FTO)薄膜,主要研究CF_3COOH,HF和SnF_2不同氟源的掺入对薄膜的表面形貌、结构以及光...以SnCl_4·5H_2O为锡源,以不同氟的化合物如CF_3COOH,HF和SnF_2为氟源,采用溶胶-凝胶-蒸镀法制备不同氟源掺杂的SnO_2(Fluorine-doped Tin Oxide,FTO)薄膜,主要研究CF_3COOH,HF和SnF_2不同氟源的掺入对薄膜的表面形貌、结构以及光电性能的影响,系统地探讨了其作用机制。结果表明:3种氟源制备的FTO薄膜表面形貌分别为不规则多边形状、棒状以及金字塔状,且均呈四方金红石型结构。3种氟源中,以SnF_2为氟源的SnO_2薄膜综合性能较佳,其方块电阻为14.7Ω/,红外反射率为86.1%。不同氟源的掺杂机制主要是F-和SnO2晶粒间的键合方式不同,或生成氟锡化合物的难易程度不同,一次掺杂的氟源(SnF_2)制备的FTO薄膜性能优于二次掺杂的(HF)以及间接性掺杂的氟源(CF_3COOH)。展开更多
基金Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant No. 51361009）, Key Program for International S＆T Cooperation Projects of Hainan Province, China （GJXM201103）, Science and Technology Department of Hainan Province, China （Grant No. 090401）, and the Natural Science Foundation of Hainan Province, China （Grant No. 513136）.
文摘Water soluble upconversion （UC） luminescence hexagonal-phase NaGdF4： yb3＋/Tm3＋ nanoparticles have been successfully synthesized by the hydrothermal method. XRD, SEM, UC photoluminescence spectra and electron paramagnetic resonance （EPR） spectrum were used to characterize the nanoparticles. The intensity of UC emission region could be controlled through different sodium source and the fluorine source, 6PJ→8S7/2 emission of Gd3＋ is also observed at 310 nm. A broad spectrum with a dominant resonance at g of about 2 was observed by the EPR spectrum of the NaGdF4：Yb3＋/Tm3＋ nanoparticles. The transparent NaGdF4：yb3＋/Tm3＋ solution presented naked eye-visible violet-blue light under the 980 nm LD excitation. The current work paves the way for their potential application in infrared tomography and magnetic resonance imaging （MRI）.
文摘以SnCl_4·5H_2O为锡源,以不同氟的化合物如CF_3COOH,HF和SnF_2为氟源,采用溶胶-凝胶-蒸镀法制备不同氟源掺杂的SnO_2(Fluorine-doped Tin Oxide,FTO)薄膜,主要研究CF_3COOH,HF和SnF_2不同氟源的掺入对薄膜的表面形貌、结构以及光电性能的影响,系统地探讨了其作用机制。结果表明:3种氟源制备的FTO薄膜表面形貌分别为不规则多边形状、棒状以及金字塔状,且均呈四方金红石型结构。3种氟源中,以SnF_2为氟源的SnO_2薄膜综合性能较佳,其方块电阻为14.7Ω/,红外反射率为86.1%。不同氟源的掺杂机制主要是F-和SnO2晶粒间的键合方式不同,或生成氟锡化合物的难易程度不同,一次掺杂的氟源(SnF_2)制备的FTO薄膜性能优于二次掺杂的(HF)以及间接性掺杂的氟源(CF_3COOH)。
