Achieving high heat-resisting room temperature phosphorescence(RTP)performance and robust white emission from pure small molecules is a meaningful but challenging work.Herein,a simple donor-acceptor(D-A)molecule,9-(1H...Achieving high heat-resisting room temperature phosphorescence(RTP)performance and robust white emission from pure small molecules is a meaningful but challenging work.Herein,a simple donor-acceptor(D-A)molecule,9-(1H-benzotriazol-1-ylmethyl)-9H-carbazole(CzBtrz),was investigated.This simple molecule not only exhibits multiple emissions including white light,thermally activated delayed fluorescence(TADF)and ultralong RTP with a lifetime of 988.54 ms at 545 nm,but also shows superhigh heat-resisting phosphorescence property which can maintain stability in a large temperature region from 77 to 350 K(ΔT=273 K),exceeding those of other RTP systems.Meanwhile,this molecule shows the time-evolved dynamic RTP.The experimental and theoretical an-alyses from CzBtrz crystal demonstrate that the intramolecular charge transfer(ICT)interaction and molecular stacking play an important role in the generation of RTP.Therefore,this work provides an efficient strategy to design ultrahigh heat-resistant RTP,ultralong RTP and single-phased white-light emitting materials.展开更多
In the present work,a zinc-based metal-organic framework{[Zn(ddpd)_(0.5)(bipy)_(0.5)]·H_(2)O]}_(n)(1-Zn)(where ddpd=2,5-di(2',4'-dic arboxylphenyl)-1,4-difluorobenzene,bipy=4,4-bipyridine)was synthesized ...In the present work,a zinc-based metal-organic framework{[Zn(ddpd)_(0.5)(bipy)_(0.5)]·H_(2)O]}_(n)(1-Zn)(where ddpd=2,5-di(2',4'-dic arboxylphenyl)-1,4-difluorobenzene,bipy=4,4-bipyridine)was synthesized by a solvothermal method.Complex 1-Zn features a threedimensional(2,4,6)-connected network with{4^2.6^2.8^2}_(2){4^4.6^6.8^5}{6}topology.Meanwhile,without the assistance of other reagents,complex 1-Zn not only exhibited an exceeded 95%photodegradation efficiency for rhodamine B(Rh B),methyl blue(MB)and methyl orange(MO)within 40 min,but also showed high stability and recyclability.In addition,free radical quenching experiments and electron spin resonance(ESR)spectroscopy verified that the main active species in the photodegradation process were·O_(2)^(-)and OH,and a more indepth degradation mechanism was further elucidated by density functional theory(DFT)calculations.展开更多
基金supported by the National Natural Science Foundation of China(U1904183,22171123 and 22102068)the Natural Science Foundation for Excellent Young Scholars of Henan Province(232300421083,212300410061)+2 种基金the Program for Innovative Research Team from the University of Henan Province(24IRTSTHN005)the Science and Technology R&D program of the Joint Funds of Henan Province(225200810082)the Open Foundation of State Key Laboratory of Structural Chemistry(20230021).
文摘Achieving high heat-resisting room temperature phosphorescence(RTP)performance and robust white emission from pure small molecules is a meaningful but challenging work.Herein,a simple donor-acceptor(D-A)molecule,9-(1H-benzotriazol-1-ylmethyl)-9H-carbazole(CzBtrz),was investigated.This simple molecule not only exhibits multiple emissions including white light,thermally activated delayed fluorescence(TADF)and ultralong RTP with a lifetime of 988.54 ms at 545 nm,but also shows superhigh heat-resisting phosphorescence property which can maintain stability in a large temperature region from 77 to 350 K(ΔT=273 K),exceeding those of other RTP systems.Meanwhile,this molecule shows the time-evolved dynamic RTP.The experimental and theoretical an-alyses from CzBtrz crystal demonstrate that the intramolecular charge transfer(ICT)interaction and molecular stacking play an important role in the generation of RTP.Therefore,this work provides an efficient strategy to design ultrahigh heat-resistant RTP,ultralong RTP and single-phased white-light emitting materials.
基金the financial support of this work by the National Natural Science Foundation of China(No.U1904199)the Program for Science&Technology Innovation Team in Universities of Henan Province(No.21IRTSTHN004)+3 种基金the Program for Science and Technology Innovation Talents at the University of Henan Province(No.22HASTIT007)Science Foundation for Excellent Youth of Henan Province(No.212300410064)the Young Backbone Teachers in Colleges and Universities of Henan Province(No.2018GGJS119)Nanyang Normal University。
文摘In the present work,a zinc-based metal-organic framework{[Zn(ddpd)_(0.5)(bipy)_(0.5)]·H_(2)O]}_(n)(1-Zn)(where ddpd=2,5-di(2',4'-dic arboxylphenyl)-1,4-difluorobenzene,bipy=4,4-bipyridine)was synthesized by a solvothermal method.Complex 1-Zn features a threedimensional(2,4,6)-connected network with{4^2.6^2.8^2}_(2){4^4.6^6.8^5}{6}topology.Meanwhile,without the assistance of other reagents,complex 1-Zn not only exhibited an exceeded 95%photodegradation efficiency for rhodamine B(Rh B),methyl blue(MB)and methyl orange(MO)within 40 min,but also showed high stability and recyclability.In addition,free radical quenching experiments and electron spin resonance(ESR)spectroscopy verified that the main active species in the photodegradation process were·O_(2)^(-)and OH,and a more indepth degradation mechanism was further elucidated by density functional theory(DFT)calculations.
