Cocrystal has been discovered and studied for more than 170 years since 1844, while the applications to optoelectronics only begin in the last decade. Several general questions that chemists and materials scientists c...Cocrystal has been discovered and studied for more than 170 years since 1844, while the applications to optoelectronics only begin in the last decade. Several general questions that chemists and materials scientists currently seek to answer are: can we design and control the molecular self-assembly and cocrystal growth, what’s the packing-property correlations, as well as how can we improve device parameters for real applications in industry. In this contribution, we review our and other groups’ recent advances in the cocrystal research field sequentially including:(1) nucleation and growth mechanisms for selective preparation of cocrystals with different donor/acceptor ratio and morphology;(2) charge transport and electronic devices, particularly field-effect transistor(FET) and photo-response device. We discuss the in-situ single crystal device fabrication method, ambipolar charge transport, and molecular packingcharge separation correlation;(3) photonic and optical property, focusing on optical waveguide, photonic logic computation, and nonlinear optics(NLO). We present unusual optical properties revealed by advanced instruments and general structure-function relations for future study. Importantly, the extensive investigations described herein yield in-depth and detailed understandings of molecular cocrystals,and show that such bi-component material systems together with the developed instrument measurement methodologies have the potential to initiate unconventional electronic and photonic science and technology.展开更多
Organic long-persistent luminescence(LPL)materials,featuring low preparation cost,eco-friendly synthesis,and easy modification of functional groups,have exhibited extensive applications in information encryption,anti-...Organic long-persistent luminescence(LPL)materials,featuring low preparation cost,eco-friendly synthesis,and easy modification of functional groups,have exhibited extensive applications in information encryption,anti-counterfeiting,and biological imaging.Several design strategies including crystallization-inducement,H-aggregation,and host-vip doping to enhance persistent-room-temperature phosphorescence(RTP)effect by precisely controlling intersystem crossing(ISC)constant and suppressing nonradiative decay rates,those are important strategies to enable LPL performance.Among the strategies,researchers have made several efforts to enhance persistent-RTP effect by host-vip interaction,in which the host matrices provide a rigid environment for phosphor vip molecules.The interaction of the luminescent vip molecules with the host matrix can effectively reduce the vibration and rotation of the luminescent molecules,and suppress the non-radiative inactivation,thereby improving the phosphorescence quantum yield.This review aims to summarize several design strategies of pure organic LPL materials based on persistent-RTP effect through host-vip interaction,and describe some applications of pure organic LPL materials in different fields.展开更多
基金This work was supported by the National Key R&D Program(2017YFA0204503,2016YFB0401100)the National Natural Science Foundation of China(91833306,21875158,51633006,51703159,and 51733004)。
文摘Cocrystal has been discovered and studied for more than 170 years since 1844, while the applications to optoelectronics only begin in the last decade. Several general questions that chemists and materials scientists currently seek to answer are: can we design and control the molecular self-assembly and cocrystal growth, what’s the packing-property correlations, as well as how can we improve device parameters for real applications in industry. In this contribution, we review our and other groups’ recent advances in the cocrystal research field sequentially including:(1) nucleation and growth mechanisms for selective preparation of cocrystals with different donor/acceptor ratio and morphology;(2) charge transport and electronic devices, particularly field-effect transistor(FET) and photo-response device. We discuss the in-situ single crystal device fabrication method, ambipolar charge transport, and molecular packingcharge separation correlation;(3) photonic and optical property, focusing on optical waveguide, photonic logic computation, and nonlinear optics(NLO). We present unusual optical properties revealed by advanced instruments and general structure-function relations for future study. Importantly, the extensive investigations described herein yield in-depth and detailed understandings of molecular cocrystals,and show that such bi-component material systems together with the developed instrument measurement methodologies have the potential to initiate unconventional electronic and photonic science and technology.
基金o National Natural Science Foundation of China(No.22178263)Natural Science Foundation of Tianjin City(No.22JCQNJC00770)Haihe Laboratory of Sustainable Chemical Transformations.The authors also thank Mr.Ben Parks from the Southern Illinois University Carbondale for proofreading the manuscript.
文摘Organic long-persistent luminescence(LPL)materials,featuring low preparation cost,eco-friendly synthesis,and easy modification of functional groups,have exhibited extensive applications in information encryption,anti-counterfeiting,and biological imaging.Several design strategies including crystallization-inducement,H-aggregation,and host-vip doping to enhance persistent-room-temperature phosphorescence(RTP)effect by precisely controlling intersystem crossing(ISC)constant and suppressing nonradiative decay rates,those are important strategies to enable LPL performance.Among the strategies,researchers have made several efforts to enhance persistent-RTP effect by host-vip interaction,in which the host matrices provide a rigid environment for phosphor vip molecules.The interaction of the luminescent vip molecules with the host matrix can effectively reduce the vibration and rotation of the luminescent molecules,and suppress the non-radiative inactivation,thereby improving the phosphorescence quantum yield.This review aims to summarize several design strategies of pure organic LPL materials based on persistent-RTP effect through host-vip interaction,and describe some applications of pure organic LPL materials in different fields.
