Luminescent lanthanide complexes have been widely investigated as light emitting materials in bio-imaging and sensing, solid state lighting and display, anti-fake tags and light conversion films, due to their characte...Luminescent lanthanide complexes have been widely investigated as light emitting materials in bio-imaging and sensing, solid state lighting and display, anti-fake tags and light conversion films, due to their characterized photophysical properties including large Stokes shift, long lifetime, and sharp emission spectrum, arising from the sensitized f-f transitions. In this review, we summarize the most recent advances in luminescent lanthanide complexes and their applications from 2015 to August 2017 concerning of general concepts to potential applications. We first introduce the basic concept of sensitized luminescence of lanthanide complexes and the strategies used for highly luminescent complexes. Then recent varieties of luminescent lanthanide complexes and their hybrid materials are presented. Finally, applications are discussed in detail.展开更多
Novel CdSe quantum dot （QD）-sensitized Au/TiO2 hybrid mesoporous films have been designed, fabricated, and evaluated for photoelectrochemical （PEC） applications. The Au/TiO2 hybrid structures were made by assembly...Novel CdSe quantum dot （QD）-sensitized Au/TiO2 hybrid mesoporous films have been designed, fabricated, and evaluated for photoelectrochemical （PEC） applications. The Au/TiO2 hybrid structures were made by assembly of Au and TiO2 nanoparticles （NPs）. A chemical bath deposition method was applied to deposit CdSe QDs on TiO2 NP films with and without Au NPs embedded. We observed significant enhancements in photocurrent for the film with Au NPs, in the entire spectral region we studied （350-600 nm）. Incident-photon-to-current efficiency （IPCE） data revealed an average enhancement of 50%, and the enhancement was more significant at short wavelength. This substantially improved PEC performance is tentatively attributed to the increased light absorption of CdSe QDs due to light scattering by Au NPs. Interestingly, without QD sensitization, the Au NPs quenched the photocurrent of TiO2 films, due to the dominance of electron trapping over light scattering by Au NPs. The results suggest that metal NPs are potentially useful for improving the photoresponse in PEC cells and possibly in other devices such as solar cells based on QD-sensitized metal oxide nanostructured films. This work demonstrates that metal NPs can serve as light scattering centers, besides functioning as photo-sensitizers and electron traps. The function of metal NPs in a particular nanocomposite film is strongly dependent on their structure and morphology.展开更多
SnO2-based varistor samples doped with Co2O3,Nb2O5 and Cr2O3 were prepared by ball-mixed oxide method.The microstructure,nonlinear I-V characteristic and surge current performances of these samples were investigated.T...SnO2-based varistor samples doped with Co2O3,Nb2O5 and Cr2O3 were prepared by ball-mixed oxide method.The microstructure,nonlinear I-V characteristic and surge current performances of these samples were investigated.This paper mainly focused on the dependence of the residual voltage ratio behavior of SnO2-based varistors on Nb2O5 addition,different factors influencing the residual voltage ratio in different concentration of Nb2O5 were analyzed.The Nb2O5 addition influences its residual voltage ratio by changing the grain size,forming defects(especially the free electrons) and cumulative effect.The measured results indicated that the optimally obtained sample with 0.07mol% Nb2O5 possesses the lowest residual voltage ratio of 1.86,the corresponding nonlinear coefficient and the threshold electric field are 42.6 and 364.6 V/mm,respectively.展开更多
基金supported by the National Key Basic Research Program of China(Grant No.2014CB643802)the National Natural Science Foundation of China(Grant Nos.21371012,21321001,and 21621061)
文摘Luminescent lanthanide complexes have been widely investigated as light emitting materials in bio-imaging and sensing, solid state lighting and display, anti-fake tags and light conversion films, due to their characterized photophysical properties including large Stokes shift, long lifetime, and sharp emission spectrum, arising from the sensitized f-f transitions. In this review, we summarize the most recent advances in luminescent lanthanide complexes and their applications from 2015 to August 2017 concerning of general concepts to potential applications. We first introduce the basic concept of sensitized luminescence of lanthanide complexes and the strategies used for highly luminescent complexes. Then recent varieties of luminescent lanthanide complexes and their hybrid materials are presented. Finally, applications are discussed in detail.
基金LLP would like to thank the Chinese Scholarship Council （CSC） for financial aid. YL gratefully acknowledges the support of a US National Science Foundation CAREER award （No. DMRJ0847786）. YDL would like to thank the National Natural Science Foundation of China （No. 90606006） for financial support. JZZ is grateful to the Basic Energy Sciences Division of the US Department of Energy （DOE） （No. 05ER4623A00） for financial support.
文摘Novel CdSe quantum dot （QD）-sensitized Au/TiO2 hybrid mesoporous films have been designed, fabricated, and evaluated for photoelectrochemical （PEC） applications. The Au/TiO2 hybrid structures were made by assembly of Au and TiO2 nanoparticles （NPs）. A chemical bath deposition method was applied to deposit CdSe QDs on TiO2 NP films with and without Au NPs embedded. We observed significant enhancements in photocurrent for the film with Au NPs, in the entire spectral region we studied （350-600 nm）. Incident-photon-to-current efficiency （IPCE） data revealed an average enhancement of 50%, and the enhancement was more significant at short wavelength. This substantially improved PEC performance is tentatively attributed to the increased light absorption of CdSe QDs due to light scattering by Au NPs. Interestingly, without QD sensitization, the Au NPs quenched the photocurrent of TiO2 films, due to the dominance of electron trapping over light scattering by Au NPs. The results suggest that metal NPs are potentially useful for improving the photoresponse in PEC cells and possibly in other devices such as solar cells based on QD-sensitized metal oxide nanostructured films. This work demonstrates that metal NPs can serve as light scattering centers, besides functioning as photo-sensitizers and electron traps. The function of metal NPs in a particular nanocomposite film is strongly dependent on their structure and morphology.
基金supported by the National Natural Science Foundations of China (Grants Nos 50425721 and 50737001)
文摘SnO2-based varistor samples doped with Co2O3,Nb2O5 and Cr2O3 were prepared by ball-mixed oxide method.The microstructure,nonlinear I-V characteristic and surge current performances of these samples were investigated.This paper mainly focused on the dependence of the residual voltage ratio behavior of SnO2-based varistors on Nb2O5 addition,different factors influencing the residual voltage ratio in different concentration of Nb2O5 were analyzed.The Nb2O5 addition influences its residual voltage ratio by changing the grain size,forming defects(especially the free electrons) and cumulative effect.The measured results indicated that the optimally obtained sample with 0.07mol% Nb2O5 possesses the lowest residual voltage ratio of 1.86,the corresponding nonlinear coefficient and the threshold electric field are 42.6 and 364.6 V/mm,respectively.
