以二(三苯基膦)二氯化钯[Pd(PPh3)2Cl2]或醋酸钯[Pd(OAc)2]与三环己基膦作为催化剂,通过Sonagashira或Suzuki碳-碳偶联反应制备了3种含2,3-二(4'-辛氧基苯基)-5,8-二硒吩基喹喔啉单元的聚苯撑乙炔类(P1)、聚芴类(P2)和聚咔唑类(P3)...以二(三苯基膦)二氯化钯[Pd(PPh3)2Cl2]或醋酸钯[Pd(OAc)2]与三环己基膦作为催化剂,通过Sonagashira或Suzuki碳-碳偶联反应制备了3种含2,3-二(4'-辛氧基苯基)-5,8-二硒吩基喹喔啉单元的聚苯撑乙炔类(P1)、聚芴类(P2)和聚咔唑类(P3)π-共轭交替共聚物。经傅里叶变换红外光谱、氢核磁共振谱、紫外-可见光谱、荧光光谱、循环伏安、X射线粉末衍射、热重和凝胶渗透色谱等测试手段对其进行了表征并研究共聚物在CHCl3-CF3COOH混合溶液中的酸致变色行为。结果表明,得到的共聚物在甲苯、氯仿、四氢呋喃等有机溶剂里具有很好的溶解性,3种共聚物在CHCl3和薄膜状态下长波长处的紫外-可见最大吸收波长分别在546 nm、542 nm、538 nm和586 nm、552 nm、558 nm处出现。共聚物的光学能隙分别为1.80 e V、1.86 e V和1.84 e V。与P1和P2相比,P3显示较好的酸致变色行为并且三氟乙酸浓度在1.346×10-3~13.46×10-3mol/L范围之间其表现出酸浓度与吸光度之间的线性关系。通过循环伏安测试,共聚物均具有一定的p掺杂和空穴传输行为。展开更多
Developing open-shell singlet(OS)diradicals with high luminescent properties and exceptional single-molecule magnetoluminescence(ML)performance is extremely challenging.Herein,we propose a concept to enhance luminesce...Developing open-shell singlet(OS)diradicals with high luminescent properties and exceptional single-molecule magnetoluminescence(ML)performance is extremely challenging.Herein,we propose a concept to enhance luminescent efficiency by adjusting the donor conjugation of OS diradicals,thereby achieving a highly luminescent diradical,DR1,with outstanding stability and making it a viable option for use in the emitting layer of organic light-emitting diodes(OLEDs).More importantly,the 0.5wt%-DR1 doped film demonstrates significant single-molecule magnetoluminescence(ML)properties.A giant ML value of 210%is achieved at a magnetic field of 7T,showing the great potential of DR1 in magneto-optoelectronic devices.展开更多
Radical-based light-emitting diodes are an innovative type of organic light-emitting diodes(OLEDs),which adopt luminescent radicals as emitters,aiming at improving the external quantum efficiency(EQE)of OLEDs.Research...Radical-based light-emitting diodes are an innovative type of organic light-emitting diodes(OLEDs),which adopt luminescent radicals as emitters,aiming at improving the external quantum efficiency(EQE)of OLEDs.Research on luminescent radicals and the corresponding devices is a multidisciplinary field involving organic chemistry,solid-state physics,photochemistry,electronics,and others.The relevant theories have been established step-by-step in recent years.展开更多
Stable organic luminescent radicals are a special class of compounds integrating optical,electrical,and magnetic properties.Luminescent radicals not only have potential applications in the field of the organic light-e...Stable organic luminescent radicals are a special class of compounds integrating optical,electrical,and magnetic properties.Luminescent radicals not only have potential applications in the field of the organic light-emitting diodes(OLEDs)but can also be applied in the fields of fluorescence sensing,bioimaging,and so forth.Nevertheless,due to the adverse effects of solvent polarity on the luminescent performance of radicals,no feasible approaches have been found in the literature toward fluorescent sensing.In this work,we report two luminescent radicals,2αPyID-TTM and 2δPyID-TTM,whose emissions show high efficiency and less dependence on solvent polarity.Both radicals show remarkable protonation–deprotonation properties.Besides,2αPyID-TTM exhibits significant fluorescence quenching and colorimetric response toward Fe^(3+)in aqueous solution.This suggests the possibility of a fluorometric/colorimetric dual-channel probe for Fe^(3+).Moreover,an optimized OLED using 2δPyID-TTM as an emissive dopant shows pure red emission and a maximum external quantum efficiency(EQE)of 10.6%.These results show promise for luminescent radicals as fluorescent probes and electroluminescent emitters.展开更多
文摘以二(三苯基膦)二氯化钯[Pd(PPh3)2Cl2]或醋酸钯[Pd(OAc)2]与三环己基膦作为催化剂,通过Sonagashira或Suzuki碳-碳偶联反应制备了3种含2,3-二(4'-辛氧基苯基)-5,8-二硒吩基喹喔啉单元的聚苯撑乙炔类(P1)、聚芴类(P2)和聚咔唑类(P3)π-共轭交替共聚物。经傅里叶变换红外光谱、氢核磁共振谱、紫外-可见光谱、荧光光谱、循环伏安、X射线粉末衍射、热重和凝胶渗透色谱等测试手段对其进行了表征并研究共聚物在CHCl3-CF3COOH混合溶液中的酸致变色行为。结果表明,得到的共聚物在甲苯、氯仿、四氢呋喃等有机溶剂里具有很好的溶解性,3种共聚物在CHCl3和薄膜状态下长波长处的紫外-可见最大吸收波长分别在546 nm、542 nm、538 nm和586 nm、552 nm、558 nm处出现。共聚物的光学能隙分别为1.80 e V、1.86 e V和1.84 e V。与P1和P2相比,P3显示较好的酸致变色行为并且三氟乙酸浓度在1.346×10-3~13.46×10-3mol/L范围之间其表现出酸浓度与吸光度之间的线性关系。通过循环伏安测试,共聚物均具有一定的p掺杂和空穴传输行为。
基金supported by the National Natural Science Foundation of China(Grant Nos.52103210,62022040,51972171,and 61935017)Department of Science and Technology of Jilin Province(20230101363JC)+1 种基金Scientific Research Fund for Doctor of Weifang University(2020BS17)the Science and Technology Huimin Plan of Weifang High-tech Zone(2020KJHM02).
文摘Developing open-shell singlet(OS)diradicals with high luminescent properties and exceptional single-molecule magnetoluminescence(ML)performance is extremely challenging.Herein,we propose a concept to enhance luminescent efficiency by adjusting the donor conjugation of OS diradicals,thereby achieving a highly luminescent diradical,DR1,with outstanding stability and making it a viable option for use in the emitting layer of organic light-emitting diodes(OLEDs).More importantly,the 0.5wt%-DR1 doped film demonstrates significant single-molecule magnetoluminescence(ML)properties.A giant ML value of 210%is achieved at a magnetic field of 7T,showing the great potential of DR1 in magneto-optoelectronic devices.
基金support from the National Natural Science Foundation of China(grant nos.51925303,91833304,and 51673080)the program“JLUSTIRT”(grant no.2019TD-33).
文摘Radical-based light-emitting diodes are an innovative type of organic light-emitting diodes(OLEDs),which adopt luminescent radicals as emitters,aiming at improving the external quantum efficiency(EQE)of OLEDs.Research on luminescent radicals and the corresponding devices is a multidisciplinary field involving organic chemistry,solid-state physics,photochemistry,electronics,and others.The relevant theories have been established step-by-step in recent years.
基金This research was made possible by a generous grant from the National Natural Science Foundation of China(grant nos.51925303,21875083,and 91833304)the China Postdoctoral Science Foundation(grant nos.2020TQ0117 and 2020M681033)the program“JLUSTIRT”(grant no.2019TD-33).
文摘Stable organic luminescent radicals are a special class of compounds integrating optical,electrical,and magnetic properties.Luminescent radicals not only have potential applications in the field of the organic light-emitting diodes(OLEDs)but can also be applied in the fields of fluorescence sensing,bioimaging,and so forth.Nevertheless,due to the adverse effects of solvent polarity on the luminescent performance of radicals,no feasible approaches have been found in the literature toward fluorescent sensing.In this work,we report two luminescent radicals,2αPyID-TTM and 2δPyID-TTM,whose emissions show high efficiency and less dependence on solvent polarity.Both radicals show remarkable protonation–deprotonation properties.Besides,2αPyID-TTM exhibits significant fluorescence quenching and colorimetric response toward Fe^(3+)in aqueous solution.This suggests the possibility of a fluorometric/colorimetric dual-channel probe for Fe^(3+).Moreover,an optimized OLED using 2δPyID-TTM as an emissive dopant shows pure red emission and a maximum external quantum efficiency(EQE)of 10.6%.These results show promise for luminescent radicals as fluorescent probes and electroluminescent emitters.
