A three-dimensional(3 D) Cd-based metal-organic framework(MOF), [Cd(H2 O)(PAA)]·(H2 O)2(complex 1) has been rationally designed and synthesized by using 4-(pyrimidin-5-yl)isophthalic acid(H2 PAA) and Cd(NO3)2...A three-dimensional(3 D) Cd-based metal-organic framework(MOF), [Cd(H2 O)(PAA)]·(H2 O)2(complex 1) has been rationally designed and synthesized by using 4-(pyrimidin-5-yl)isophthalic acid(H2 PAA) and Cd(NO3)2·4 H2 O under solvothermal conditions. The structure has been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction(PXRD) and thermogravimetric analyses(TGA). Single-crystal X-ray diffraction analyses reveal that complex 1 consists of a 3 D network with one-dimensional(1 D) channels. Moreover, 1 exhibits strong luminescent emission in solid state at room temperature. Fluorescence quenching was observed when treating complex 1 with picric acid(PA), 2,4-dinitrophenylhydrazine(2,4-DNPH) and p-nitroaniline(p-NA), revealing that the as-synthesized complex could be used as a luminescence sensor for the detection of PA, 2,4-DNPH and p-NA.展开更多
We demonstrate that an asynchronous CSMA/CD protocol with an optical loop-back star coupler can achieve high upstream channel utilizatbn in an Ethernet PON, readily supporting a large installed base of Ethernet 10Base...We demonstrate that an asynchronous CSMA/CD protocol with an optical loop-back star coupler can achieve high upstream channel utilizatbn in an Ethernet PON, readily supporting a large installed base of Ethernet 10BaseT and 100BaseT interfaces.展开更多
Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton stat...Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton state regulation by doping.However,it remains controversial whether the doping sites are in the octahedra or tetrahedra of Cs_(7)Cd_(3)Br_(13).To address this,we introduced Pb^(2+)and Sb^(3+)ions and,supported by experimental and theoretical evidence,demonstrated that these ions preferentially occupy the octahedra.Among them,Pb^(2+)ions single doping achieves a near-unity photoluminescence quantum yield of 93.7%,which results in excellent X-ray scintillation performance,high light yield of 41,772 photon MeV^(-1),and a low detection limit of 29.78 nGyairs-1.Moreover,this incorporation of Pb^(2+)and Sb^(3+)enabled an exciton state regulation strategy,resulting in standard white light emission with CIE chromaticity coordinates of(0.33,0.33).Additionally,a multifaceted optical anticounterfeiting and information encryption scheme was designed based on the differences in optical properties caused by the different sensitivities of[PbBr6]4-octahedron and[SbBr6]3-octahedron to temperature and excitation wavelengths.These diverse photoluminescence characteristics provide new insights and practical demonstrations for advanced X-ray imaging,lighting,optical encryption,and anticounterfeiting technologies.展开更多
基金supported by the Natural Science Foundation of Shaanxi Province(2018JQ2079,2018JQ2040,2018JM2055)
文摘A three-dimensional(3 D) Cd-based metal-organic framework(MOF), [Cd(H2 O)(PAA)]·(H2 O)2(complex 1) has been rationally designed and synthesized by using 4-(pyrimidin-5-yl)isophthalic acid(H2 PAA) and Cd(NO3)2·4 H2 O under solvothermal conditions. The structure has been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction(PXRD) and thermogravimetric analyses(TGA). Single-crystal X-ray diffraction analyses reveal that complex 1 consists of a 3 D network with one-dimensional(1 D) channels. Moreover, 1 exhibits strong luminescent emission in solid state at room temperature. Fluorescence quenching was observed when treating complex 1 with picric acid(PA), 2,4-dinitrophenylhydrazine(2,4-DNPH) and p-nitroaniline(p-NA), revealing that the as-synthesized complex could be used as a luminescence sensor for the detection of PA, 2,4-DNPH and p-NA.
文摘We demonstrate that an asynchronous CSMA/CD protocol with an optical loop-back star coupler can achieve high upstream channel utilizatbn in an Ethernet PON, readily supporting a large installed base of Ethernet 10BaseT and 100BaseT interfaces.
基金funded by the Jinan Central Hospital Collaboration(1190022050)Foundation for Innovative Research Groups of the National Natural Science Foundation of China(22205233,62374103,62374104,and 62405165)+3 种基金Basic and Applied Basic Research Foundation of Guangdong Province(2024A1515010926)Taishan Scholar Foundation of Shandong Province of Shandong Province(tsqn202312005)Postdoctoral Innovative Projects of Shandong Province(202400321)China Postdoctoral Science Foundation(2024M751789)。
文摘Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton state regulation by doping.However,it remains controversial whether the doping sites are in the octahedra or tetrahedra of Cs_(7)Cd_(3)Br_(13).To address this,we introduced Pb^(2+)and Sb^(3+)ions and,supported by experimental and theoretical evidence,demonstrated that these ions preferentially occupy the octahedra.Among them,Pb^(2+)ions single doping achieves a near-unity photoluminescence quantum yield of 93.7%,which results in excellent X-ray scintillation performance,high light yield of 41,772 photon MeV^(-1),and a low detection limit of 29.78 nGyairs-1.Moreover,this incorporation of Pb^(2+)and Sb^(3+)enabled an exciton state regulation strategy,resulting in standard white light emission with CIE chromaticity coordinates of(0.33,0.33).Additionally,a multifaceted optical anticounterfeiting and information encryption scheme was designed based on the differences in optical properties caused by the different sensitivities of[PbBr6]4-octahedron and[SbBr6]3-octahedron to temperature and excitation wavelengths.These diverse photoluminescence characteristics provide new insights and practical demonstrations for advanced X-ray imaging,lighting,optical encryption,and anticounterfeiting technologies.
