Achieving rational control over polarization states and color of circularly polarized luminescence(CPL)through simple modulation poses a challenging yet highly practical problem.To address this issue,we developed a me...Achieving rational control over polarization states and color of circularly polarized luminescence(CPL)through simple modulation poses a challenging yet highly practical problem.To address this issue,we developed a mechano-responsive chiral supramolecular system based on a cyclohexanediamide-derived gelator CCPy.This molecule exhibited a strong blue fluorescence accompanied by a distinct CPL signal upon forming a supramolecular gel in toluene.However,upon the application of mechanical force,the gel rapidly transformed into a faintly emissive suspension with a silent CPL signal,along with a notable morphological alteration.Furthermore,by implementing the circularly polarized Förster resonance energy transfer(CP-FRET)strategy,the mechano-responsiveness was effectively imparted to binary systems through the incorporation of dyes Nile red(NR)and coumarin 7(C7),thus realizing mechanical force-switchable green and red CPL systems.It was particularly noteworthy that by adjusting the ratio of CCPy,C7 and NR,a ternary mechanical force-induced CPL ON-OFF switch that emitted a standard white emission was achieved through sequential CP-FRET.Following this,an information encryption experiment was performed.This work provided a paradigm for fabricating smart multi-color and white-light CPL materials.展开更多
Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for f...Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for fluorescence switches, mechanosensors, security papers, optoelectronic devices and data storage etc. In the past few years, systematic investigations have been carried out, resulting in the production of a variety of mechanoluminescent materials. In this review, recent progress in pure organic mechanoluminescent materials is summarized, including mechanofluorescent and triboluminescent effects from conjugated small molecules.展开更多
Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under stress.Molecular-level responses to damage with both stress-reporting and self-str...Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under stress.Molecular-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic polymers.To overcome this challenge,chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials design.Here,we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide(Se–Se)as a mechanophore.Polyurethane has been functionalized with labile Se–Se bonds,whosemechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in situ.These reactions are activated efficiently in a mechanical way by compression in bulk materials.The resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed film.This study not only illuminates themechano-responsive nature of Se–Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.展开更多
基金financialsupport from the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB0770101)the National Key R&D Program of China(No.2023YFA1508900)the National Natural Science Foundation of China(Nos.22202211 and 52321006).
文摘Achieving rational control over polarization states and color of circularly polarized luminescence(CPL)through simple modulation poses a challenging yet highly practical problem.To address this issue,we developed a mechano-responsive chiral supramolecular system based on a cyclohexanediamide-derived gelator CCPy.This molecule exhibited a strong blue fluorescence accompanied by a distinct CPL signal upon forming a supramolecular gel in toluene.However,upon the application of mechanical force,the gel rapidly transformed into a faintly emissive suspension with a silent CPL signal,along with a notable morphological alteration.Furthermore,by implementing the circularly polarized Förster resonance energy transfer(CP-FRET)strategy,the mechano-responsiveness was effectively imparted to binary systems through the incorporation of dyes Nile red(NR)and coumarin 7(C7),thus realizing mechanical force-switchable green and red CPL systems.It was particularly noteworthy that by adjusting the ratio of CCPy,C7 and NR,a ternary mechanical force-induced CPL ON-OFF switch that emitted a standard white emission was achieved through sequential CP-FRET.Following this,an information encryption experiment was performed.This work provided a paradigm for fabricating smart multi-color and white-light CPL materials.
基金Financial support by the National Natural Science Foundation of China(Nos. 21522405 and 51503142)the Thousand Youth Talents Planthe Natural Science Foundation of Tianjin (No. 15JCYBJC52900)
文摘Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for fluorescence switches, mechanosensors, security papers, optoelectronic devices and data storage etc. In the past few years, systematic investigations have been carried out, resulting in the production of a variety of mechanoluminescent materials. In this review, recent progress in pure organic mechanoluminescent materials is summarized, including mechanofluorescent and triboluminescent effects from conjugated small molecules.
基金support of this research by the National Natural Science Foundation of China(grant nos.21734006 and 21975178)the National Key Research and Development Program of China(grant nos.2017YFA0207800 and 2017YFA0204503)is gratefully acknowledged.
文摘Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under stress.Molecular-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic polymers.To overcome this challenge,chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials design.Here,we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide(Se–Se)as a mechanophore.Polyurethane has been functionalized with labile Se–Se bonds,whosemechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in situ.These reactions are activated efficiently in a mechanical way by compression in bulk materials.The resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed film.This study not only illuminates themechano-responsive nature of Se–Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.
