The nonuniform Yb-Er Codoped Al2O3 films were prepared on SiO2/Si substrates using a medium frequency magnetron sputtering system. Two asymmetry targets in the system were introduced to realize the nonuniform dopant. ...The nonuniform Yb-Er Codoped Al2O3 films were prepared on SiO2/Si substrates using a medium frequency magnetron sputtering system. Two asymmetry targets in the system were introduced to realize the nonuniform dopant. Some curves of Photoluminescence （PL） peak intensity were obtained by adjusting the deposition parameters, such as, the pillar number of erbium and ytterbium in the mixed target and the distance between a sample table and targets. Typically, the curve of PL peak intensity against the offset distance was approximately linear. The ratio of the PL intensity at the two ends of the same sample was 12.6 and the slope was 71.83/mm when the pillar numbers of the erbium and ytterbium in the mixed target are 5 and 60, respectively, and the distance between targets and the sample table is 2.9 cm.展开更多
yb^3＋-Er^3＋ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performe...yb^3＋-Er^3＋ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performed to analyze the measured absorption spectra. The Judd-Ofelt intensity parameters Ω4 and Ω6 decrease with increasing SiO2 content. The emission cross-section of Er^3＋ decreases from 0.82×10^-20cm^2 to 0.76 × 10^-20cm^2 as the SiO2 content varies from 0 to 20 mol%.展开更多
为了快速判别稀土掺杂晶体材料的上转换发光能力,设计并采用液–固相转移法合成Yb^(3+)/Er^(3+)双掺MLuxFy(M为Li、Na、K、Rb或Cs;x=1,y=4或x=2,y=7)材料体系,使用X射线衍射仪、透射电镜、拉曼光谱仪和荧光分光光度计对材料体系进行结...为了快速判别稀土掺杂晶体材料的上转换发光能力,设计并采用液–固相转移法合成Yb^(3+)/Er^(3+)双掺MLuxFy(M为Li、Na、K、Rb或Cs;x=1,y=4或x=2,y=7)材料体系,使用X射线衍射仪、透射电镜、拉曼光谱仪和荧光分光光度计对材料体系进行结构和发光性能检测。实验结果表明,Yb^(3+)/Er^(3+)双掺MLuxFy亚微米/纳米晶体在980 nm激光激发下均可实现绿色和红色上转换发光,但其上转换发光能力各不相同。实验中,利用泵浦功率阈值(pump power threshold,PPT)快速区分Yb^(3+)/Er^(3+)双掺亚微米/纳米晶体的上转换发光能力。通过分析发现,PPT与Yb^(3+)/Er^(3+)双掺亚微米/纳米晶体的最大声子能量之间存在相关性。因此,在稀土掺杂上转换发光晶体材料的筛选过程中,可在发光性能测试时使用PPT,以快速判别其上转换发光能力。展开更多
4-Nonylphenol(NP)is a kind of estrogen belonging to the endocrine disrupter,widely used in various agricultural and industrial goods.However,extensive use of NP with direct release to environment poses high risks to b...4-Nonylphenol(NP)is a kind of estrogen belonging to the endocrine disrupter,widely used in various agricultural and industrial goods.However,extensive use of NP with direct release to environment poses high risks to both human health and ecosystems.Herein,for the first time,we developed near-infrared(NIR)responsive upconversion luminescence nanosensor for NP detection.The Förster resonance energy transfer based upconversion nanoparticles(UCNPs)-graphene oxide sensor offers highly selective and sensitive detection of NP in linear ranges of 5−200 ng/mL and 200−1000 ng/mL under 980 nm and 808 nm excitation,respectively,with LOD at 4.2 ng/mL.The sensors were successfully tested for NP detection in real liquid milk samples with excellent recovery results.The rare-earth fluoride based upconversion luminescence nanosensor with NIR excitation wavelength,holds promise for sensing food,environmental,and biological samples due to their high sensitivity,specific recognition,low LOD,negligible autofluorescence,along with the deep penetration of NIR excitation sources.展开更多
基金Project supported by the National Natural Science Foundation of China (60477023)the Natural Science Foundation of Science and Tech-nology Commission of Liaoning Province (20062137)
文摘The nonuniform Yb-Er Codoped Al2O3 films were prepared on SiO2/Si substrates using a medium frequency magnetron sputtering system. Two asymmetry targets in the system were introduced to realize the nonuniform dopant. Some curves of Photoluminescence （PL） peak intensity were obtained by adjusting the deposition parameters, such as, the pillar number of erbium and ytterbium in the mixed target and the distance between a sample table and targets. Typically, the curve of PL peak intensity against the offset distance was approximately linear. The ratio of the PL intensity at the two ends of the same sample was 12.6 and the slope was 71.83/mm when the pillar numbers of the erbium and ytterbium in the mixed target are 5 and 60, respectively, and the distance between targets and the sample table is 2.9 cm.
基金Funded by the International Cooperation Project of Shanghai Municipal Science and Technology Commission (No.05S207103)
文摘yb^3＋-Er^3＋ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performed to analyze the measured absorption spectra. The Judd-Ofelt intensity parameters Ω4 and Ω6 decrease with increasing SiO2 content. The emission cross-section of Er^3＋ decreases from 0.82×10^-20cm^2 to 0.76 × 10^-20cm^2 as the SiO2 content varies from 0 to 20 mol%.
文摘为了快速判别稀土掺杂晶体材料的上转换发光能力,设计并采用液–固相转移法合成Yb^(3+)/Er^(3+)双掺MLuxFy(M为Li、Na、K、Rb或Cs;x=1,y=4或x=2,y=7)材料体系,使用X射线衍射仪、透射电镜、拉曼光谱仪和荧光分光光度计对材料体系进行结构和发光性能检测。实验结果表明,Yb^(3+)/Er^(3+)双掺MLuxFy亚微米/纳米晶体在980 nm激光激发下均可实现绿色和红色上转换发光,但其上转换发光能力各不相同。实验中,利用泵浦功率阈值(pump power threshold,PPT)快速区分Yb^(3+)/Er^(3+)双掺亚微米/纳米晶体的上转换发光能力。通过分析发现,PPT与Yb^(3+)/Er^(3+)双掺亚微米/纳米晶体的最大声子能量之间存在相关性。因此,在稀土掺杂上转换发光晶体材料的筛选过程中,可在发光性能测试时使用PPT,以快速判别其上转换发光能力。
文摘4-Nonylphenol(NP)is a kind of estrogen belonging to the endocrine disrupter,widely used in various agricultural and industrial goods.However,extensive use of NP with direct release to environment poses high risks to both human health and ecosystems.Herein,for the first time,we developed near-infrared(NIR)responsive upconversion luminescence nanosensor for NP detection.The Förster resonance energy transfer based upconversion nanoparticles(UCNPs)-graphene oxide sensor offers highly selective and sensitive detection of NP in linear ranges of 5−200 ng/mL and 200−1000 ng/mL under 980 nm and 808 nm excitation,respectively,with LOD at 4.2 ng/mL.The sensors were successfully tested for NP detection in real liquid milk samples with excellent recovery results.The rare-earth fluoride based upconversion luminescence nanosensor with NIR excitation wavelength,holds promise for sensing food,environmental,and biological samples due to their high sensitivity,specific recognition,low LOD,negligible autofluorescence,along with the deep penetration of NIR excitation sources.
