l-Acetoxy allylic phosphonates rearrange regioselectively to γ-acetoxy α,β-unsaturated phosphonates under the catalysis of Pd(0). l-Acetoxy allylic phosphonates act as the precursors of phosphonatedπ-allylic catio...l-Acetoxy allylic phosphonates rearrange regioselectively to γ-acetoxy α,β-unsaturated phosphonates under the catalysis of Pd(0). l-Acetoxy allylic phosphonates act as the precursors of phosphonatedπ-allylic cations in palladium(0) catalyzed reactions[1]. The reactions of l-acetoxy allylic phosphonates under palladium(0) catalysis with nucleophiles have been reported. 1-4 These reactions are highly regio- and stereoselective. We wish to report here the palladium(0) catalyzed reaction of l-acetoxy allylic phosphonates in the absence of a nucleophile.展开更多
Erratum to Nano Research,2023,16(4):5511–5516 https://doi.org/10.1007/s12274-022-5106-8 The title in the article was unfortunately mispresented on page 5511.The title of the article should be corrected to“On the vol...Erratum to Nano Research,2023,16(4):5511–5516 https://doi.org/10.1007/s12274-022-5106-8 The title in the article was unfortunately mispresented on page 5511.The title of the article should be corrected to“On the voltage sweep behavior of quantum dot light-emitting diode”.Instead of On the voltage behavior of quantum dot light-emitting diode It should read On the voltage sweep behavior of quantum dot light-emitting diode.展开更多
Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great impo...Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future spin-optoelectronics.However,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)properties.Achieving the balance between chirality and PL is a major challenge for strong CPL from chiral perovskites.Differently,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient conditions.Here,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS effect.The as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic cations.Besides,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two components.These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.展开更多
The origin of the efficiency drop of quantum dot light-emitting diode(QLED)under consecutive voltage sweeps is still a puzzle.In this work,we report the voltage sweep behavior of QLED.We observed the efficiency drop o...The origin of the efficiency drop of quantum dot light-emitting diode(QLED)under consecutive voltage sweeps is still a puzzle.In this work,we report the voltage sweep behavior of QLED.We observed the efficiency drop of red QLED with ZnMgO electron transport layer(ETL)under consecutive voltage sweeps.In contrast,the efficiency increases for ZnO ETL device.By analyzing the electrical characteristics of both devices and surface traps of ZnMgO and ZnO nanoparticles,we found the efficiency drop of ZnMgO device is related to the hole leakage mediated by trap state on ZnMgO nanoparticles.For ZnO device,the efficiency raise is due to suppressed electron leakage.The hole leakage also causes rapid lifetime degradation of ZnMgO device.However,the efficiency and lifetime degradation of ZnMgO device can be eliminated with shelf aging.Our work reveals the distinct voltage sweep behavior of QLED based on different ETLs and may help to understand the lifetime degradation mechanism in QLED.展开更多
Herein,we report the fabrication of high-performance transparent quantum-dot light-emitting diodes(Tr-QLEDs)with ZnO/ZnMgO inorganic double electron-transport layers(ETLs).The ETLs effectively suppress the excess elec...Herein,we report the fabrication of high-performance transparent quantum-dot light-emitting diodes(Tr-QLEDs)with ZnO/ZnMgO inorganic double electron-transport layers(ETLs).The ETLs effectively suppress the excess electron injection and facilitate charge balance in the Tr-QLEDs.The thick ETLs as buffer layers can also withstand the plasma-induced damage during the indium tin oxide sputtering.These factors collectively contribute to the development of Tr-QLEDs with improved performance.As a result,our Tr-QLEDs with double ETLs exhibited a high transmittance of 82%at 550 nm and a record external quantum efficiency of 11.8%,which is 1.27 times higher than that of the devices with pure ZnO ETL.These results indicate that the developed ZnO/ZnMgO inorganic double ETLs could offer promising solutions for realizing high-efficiency Tr-QLEDs for next-generation display devices.展开更多
We define a class of geometric flows on a complete Kahler manifold to unify some physical and mechanical models such as the motion equations of vortex filament, complex-valued mKdV equa- tions, derivative nonlinear Sc...We define a class of geometric flows on a complete Kahler manifold to unify some physical and mechanical models such as the motion equations of vortex filament, complex-valued mKdV equa- tions, derivative nonlinear SchrSdinger equations etc. Furthermore, we consider the existence for these flows from S1 into a complete Kahler manifold and prove some local and global existence results.展开更多
文摘l-Acetoxy allylic phosphonates rearrange regioselectively to γ-acetoxy α,β-unsaturated phosphonates under the catalysis of Pd(0). l-Acetoxy allylic phosphonates act as the precursors of phosphonatedπ-allylic cations in palladium(0) catalyzed reactions[1]. The reactions of l-acetoxy allylic phosphonates under palladium(0) catalysis with nucleophiles have been reported. 1-4 These reactions are highly regio- and stereoselective. We wish to report here the palladium(0) catalyzed reaction of l-acetoxy allylic phosphonates in the absence of a nucleophile.
文摘Erratum to Nano Research,2023,16(4):5511–5516 https://doi.org/10.1007/s12274-022-5106-8 The title in the article was unfortunately mispresented on page 5511.The title of the article should be corrected to“On the voltage sweep behavior of quantum dot light-emitting diode”.Instead of On the voltage behavior of quantum dot light-emitting diode It should read On the voltage sweep behavior of quantum dot light-emitting diode.
基金the CNRS through the MITI interdisciplinary programs (Action MITI: Nouveaux Materiaux 2020 and 2021)financially supported by the National Key Research and Development Program of China (2022YFB3602903, 2021YFB3602703, and 2022YFB3606504)+4 种基金the National Natural Science Foundation of China (62204107 and 12204229)Guangdong Basic and Applied Basic Research Foundation (2022A1515011614)Shenzhen Science and Technology Program (JCYJ20220818100411025)Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting (ZDSYS201707281632549)Pingshan District Innovation Platform Project of Shenzhen Hi-tech Zone Development Special Plan in 2022 (29853M-KCJ-2023-002-01)。
基金Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515011071,2019A1515111093,and 2022A1515011614)the National Natural Science Foundation of China(Nos.62122034,61875082,61905107,62204107,and 62205138)+2 种基金Innovation Project of Department of Education of Guangdong Province(No.2019KTSCX157)Shenzhen Innovation Project(Nos.JCYJ20210324104413036 and JCYJ20190809152411655)Q.Q.W.and H.M.Z.acknowledge the support from China Postdoctoral Science Foundation(Nos.2021M691397 and 2021M691411).
文摘Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future spin-optoelectronics.However,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)properties.Achieving the balance between chirality and PL is a major challenge for strong CPL from chiral perovskites.Differently,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient conditions.Here,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS effect.The as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic cations.Besides,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two components.These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.
基金supported by Key-Area Research and Development Program of Guangdong Province(Nos.2019B010925001 and 2019B010924001)Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting(No.2017KSYS007).
文摘The origin of the efficiency drop of quantum dot light-emitting diode(QLED)under consecutive voltage sweeps is still a puzzle.In this work,we report the voltage sweep behavior of QLED.We observed the efficiency drop of red QLED with ZnMgO electron transport layer(ETL)under consecutive voltage sweeps.In contrast,the efficiency increases for ZnO ETL device.By analyzing the electrical characteristics of both devices and surface traps of ZnMgO and ZnO nanoparticles,we found the efficiency drop of ZnMgO device is related to the hole leakage mediated by trap state on ZnMgO nanoparticles.For ZnO device,the efficiency raise is due to suppressed electron leakage.The hole leakage also causes rapid lifetime degradation of ZnMgO device.However,the efficiency and lifetime degradation of ZnMgO device can be eliminated with shelf aging.Our work reveals the distinct voltage sweep behavior of QLED based on different ETLs and may help to understand the lifetime degradation mechanism in QLED.
基金National Key Research and Development Program of China(2016YFB0401702,2017YFE0120400)National Natural Science Foundation of China(61674074,61704170,61875082)+3 种基金Natural Science Foundation of Guangdong Province(2017B030306010)Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting(2017KSYS007)Shenzhen Peacock Team Project(KQTD2016030111203005)Development and Reform Commission of Shenzhen Project([2017]1395).
文摘Herein,we report the fabrication of high-performance transparent quantum-dot light-emitting diodes(Tr-QLEDs)with ZnO/ZnMgO inorganic double electron-transport layers(ETLs).The ETLs effectively suppress the excess electron injection and facilitate charge balance in the Tr-QLEDs.The thick ETLs as buffer layers can also withstand the plasma-induced damage during the indium tin oxide sputtering.These factors collectively contribute to the development of Tr-QLEDs with improved performance.As a result,our Tr-QLEDs with double ETLs exhibited a high transmittance of 82%at 550 nm and a record external quantum efficiency of 11.8%,which is 1.27 times higher than that of the devices with pure ZnO ETL.These results indicate that the developed ZnO/ZnMgO inorganic double ETLs could offer promising solutions for realizing high-efficiency Tr-QLEDs for next-generation display devices.
基金Supported by National Natural Science Foundation of China(Grant No.10990013)
文摘We define a class of geometric flows on a complete Kahler manifold to unify some physical and mechanical models such as the motion equations of vortex filament, complex-valued mKdV equa- tions, derivative nonlinear SchrSdinger equations etc. Furthermore, we consider the existence for these flows from S1 into a complete Kahler manifold and prove some local and global existence results.
