The linear and nonlinear optical properties of a hydrogenic donor in a disc-like parabolic quantum dot in the presence of an external magnetic field are studied. The calculations were performed within the effective ma...The linear and nonlinear optical properties of a hydrogenic donor in a disc-like parabolic quantum dot in the presence of an external magnetic field are studied. The calculations were performed within the effective mass approximation, using the matrix diagonalization method and the compact density-matrix approach. The linear and nonlinear optical absorption coefficients between the ground （L =0） and the first excited state （L = 1） have been examined based on the computed energies and wave functions. We find that the linear, nonlinear third-order, and total optical absorption coefficients are strongly affected by the confinement strength of QDs, the external magnetic field, and the incident optical intensity.展开更多
In this study,linear absorption,single-photon excited fluorescence,fluorescence quantum yields,fluorescence lifetime and two-photon excited fluorescence of a series of triphenylamine derivatives (L1,L2,L3 and L4) have...In this study,linear absorption,single-photon excited fluorescence,fluorescence quantum yields,fluorescence lifetime and two-photon excited fluorescence of a series of triphenylamine derivatives (L1,L2,L3 and L4) have been measured.L1 and L3 are D--A type dyes,while L2 and L4 are D--D--A type dyes (D=donor,A=acceptor).The investigated compounds consist of triphenylamine-bearing donor-substituted and/or systematically extended-conjugated length,which are designed to gain insight into the effect of the ethoxyl unit and-linkage length on the linear and nonlinear optical properties.The influence of solvent polarity on the photophysical properties was investigated.Employing time-dependent density functional theory (TD-DFT) calculations,the structure-property relationships are discussed.展开更多
Re（I）tricarbonyl rhenium（I）complexes attracted much attention owing to the good cellular uptake ability and rich photophysical properties.However,normally Re（I）complexes show short triplet state lifetime and wea...Re（I）tricarbonyl rhenium（I）complexes attracted much attention owing to the good cellular uptake ability and rich photophysical properties.However,normally Re（I）complexes show short triplet state lifetime and weak absorption in the visible spectra region,and the absorption wavelength usually is shorter than 450 nm.These features are detrimental to the applications of Re（I）complexes in the areas such as photodynamic therapy（PDT）and luminescence bioimaging.Herein,a novel tricarbonyl rhenium（I）complex Re-1 with strong visible light-absorbing ability（624 nm,ε=5.69′10^4 L/（mol cm））,long-lived triplet excited state（νT=448.9ms）and moderate fluorescence quantum yield（ΦF=41.6%）was prepared.The photophysical properties of Re-1 were studied with steady state UV-Vis absorption and luminescence spectroscopies,nanosecond transient absorption spectroscopy,as well as DFT/TDDFT calculations.Re-1 was used for intracellular PDT and luminescence imaging studies.The results indicate that Re-1 shows low dark toxicity,but it is able to kill cancer cells on illumination with 635 nm LED.展开更多
基金supported by National Natural Science Foundation of China under Grant No.10775035
文摘The linear and nonlinear optical properties of a hydrogenic donor in a disc-like parabolic quantum dot in the presence of an external magnetic field are studied. The calculations were performed within the effective mass approximation, using the matrix diagonalization method and the compact density-matrix approach. The linear and nonlinear optical absorption coefficients between the ground （L =0） and the first excited state （L = 1） have been examined based on the computed energies and wave functions. We find that the linear, nonlinear third-order, and total optical absorption coefficients are strongly affected by the confinement strength of QDs, the external magnetic field, and the incident optical intensity.
基金supported by the National Natural Science Foundation of China (NSFC,21071001,51142011,21101001)Education Department of Anhui Province (KJ2010A030)the "211" Project of Anhui University
文摘In this study,linear absorption,single-photon excited fluorescence,fluorescence quantum yields,fluorescence lifetime and two-photon excited fluorescence of a series of triphenylamine derivatives (L1,L2,L3 and L4) have been measured.L1 and L3 are D--A type dyes,while L2 and L4 are D--D--A type dyes (D=donor,A=acceptor).The investigated compounds consist of triphenylamine-bearing donor-substituted and/or systematically extended-conjugated length,which are designed to gain insight into the effect of the ethoxyl unit and-linkage length on the linear and nonlinear optical properties.The influence of solvent polarity on the photophysical properties was investigated.Employing time-dependent density functional theory (TD-DFT) calculations,the structure-property relationships are discussed.
基金the National Natural Science Foundation of China(NSFC:20972024,21273028,21421005,21473020)the Royal Society(UK)and NSFC(China-UK Cost-Share Science Networks,21011130154)+3 种基金Ministry of Education(SRFDP20120041130005)Program for Changjiang Scholars and Innovative Research Team in University[IRT_13R06]the Fundamental Research Funds for the Central Universities(DUT14ZD226)Dalian University of Technology(DUT2013TB07)
文摘Re（I）tricarbonyl rhenium（I）complexes attracted much attention owing to the good cellular uptake ability and rich photophysical properties.However,normally Re（I）complexes show short triplet state lifetime and weak absorption in the visible spectra region,and the absorption wavelength usually is shorter than 450 nm.These features are detrimental to the applications of Re（I）complexes in the areas such as photodynamic therapy（PDT）and luminescence bioimaging.Herein,a novel tricarbonyl rhenium（I）complex Re-1 with strong visible light-absorbing ability（624 nm,ε=5.69′10^4 L/（mol cm））,long-lived triplet excited state（νT=448.9ms）and moderate fluorescence quantum yield（ΦF=41.6%）was prepared.The photophysical properties of Re-1 were studied with steady state UV-Vis absorption and luminescence spectroscopies,nanosecond transient absorption spectroscopy,as well as DFT/TDDFT calculations.Re-1 was used for intracellular PDT and luminescence imaging studies.The results indicate that Re-1 shows low dark toxicity,but it is able to kill cancer cells on illumination with 635 nm LED.
