The spectral properties of 8-(4-methoxyphenyl)methylene-2-phenyl-4-(4-methoxy) phenyl-5,6,7,8-tetrahydrobenzo[b]pyrylium salt in polax solvents (acetonitrile or 1,2-dichloroethane) and in non-polax solvents (toluene o...The spectral properties of 8-(4-methoxyphenyl)methylene-2-phenyl-4-(4-methoxy) phenyl-5,6,7,8-tetrahydrobenzo[b]pyrylium salt in polax solvents (acetonitrile or 1,2-dichloroethane) and in non-polax solvents (toluene or benzene) have been compared.It has been shown that there are dual fluorescence emissions in non-polar solvent at room temperature, one of which corresponds to CT (charge transfer) emission, the other to LE (local excitation) emission, whereas there is only CT fluorescence ethession in polar solventat room temperatare.展开更多
The development of fluorescent materials capable of harvesting triplet excitons efficiently is of great importance in achieving high-performance low-cost organic light-emitting diodes（OLEDs）.Among the three mechanis...The development of fluorescent materials capable of harvesting triplet excitons efficiently is of great importance in achieving high-performance low-cost organic light-emitting diodes（OLEDs）.Among the three mechanisms converting triplet to singlet excitons,triplet fusion delayed fluorescence（TFDF） plays a key role in the demonstration of highly efficient and reliable OLEDs,especially blue devices,for practice applications.This review focuses on the recent development of TFDF materials and their applications in OLEDs.Fundamental TFDF mechanism,molecular design principles,and the structure-property relationship of TFDF materials with a particular emphasis on their different excited state characters,are presented and discussed.Moreover,the future perspectives and ongoing challenges of TFDF materials are also highlighted.展开更多
文摘The spectral properties of 8-(4-methoxyphenyl)methylene-2-phenyl-4-(4-methoxy) phenyl-5,6,7,8-tetrahydrobenzo[b]pyrylium salt in polax solvents (acetonitrile or 1,2-dichloroethane) and in non-polax solvents (toluene or benzene) have been compared.It has been shown that there are dual fluorescence emissions in non-polar solvent at room temperature, one of which corresponds to CT (charge transfer) emission, the other to LE (local excitation) emission, whereas there is only CT fluorescence ethession in polar solventat room temperatare.
基金supported by the China Postdoctoral Science Foundation(2018M632498)the Zhejiang Provincial Postdoctoral fellowship,China(Z71101009)+1 种基金the National Natural Science Foundation of China(51603185,51673174)the Zhejiang Provincial Natural Science Foundation,China(LY17E030001)~~
基金supported by National Natural Science Foundation of China(No.21372168)
文摘The development of fluorescent materials capable of harvesting triplet excitons efficiently is of great importance in achieving high-performance low-cost organic light-emitting diodes（OLEDs）.Among the three mechanisms converting triplet to singlet excitons,triplet fusion delayed fluorescence（TFDF） plays a key role in the demonstration of highly efficient and reliable OLEDs,especially blue devices,for practice applications.This review focuses on the recent development of TFDF materials and their applications in OLEDs.Fundamental TFDF mechanism,molecular design principles,and the structure-property relationship of TFDF materials with a particular emphasis on their different excited state characters,are presented and discussed.Moreover,the future perspectives and ongoing challenges of TFDF materials are also highlighted.
