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Tunable room-temperature phosphorescence and circularly polarized luminescence encoding helical supramolecular polymer

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Science China Chemistry 2022年第1期65卷 75-81页

作者： Chen Xu Chenjia Yin Wenjun Wu Xiang Ma Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistryInstitute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Supramolecular polymers with different functionalities have been continuously developed in the past decade because of their indispensable role in soft ***,pure organic supramolecular polymers with stable room temperature phosphorescence(RTP)emission were very rarely reported for the difficulties of synthesis and achieving RTP in ***,soluble helical supramolecular polymers with circularly polarized room-temperature phosphorescence were developed via a facile hostguest *** assembly,a transition from pure fluorescence to almost pure RTP emission was *** the asymmetry of guest could easily control the chiroptical property of supramolecular *** work provides new opportunities for the design and development of intelligent soft functional soft materials.

关键词： room-temperature phosphorescence circularly polarized luminescence supramolecular polymer helical handedness

Dynamic room-temperature phosphorescence by reversible transformation of photo-induced free radicals

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Science China Chemistry 2022年第8期65卷 1538-1543页

作者： Xiaokang Yao Huifang Shi Xiao Wang He Wang Qiuying Li Yuxin Li Jian Liang Jingjie Li Yixiao He Huili Ma Wei Huang Zhongfu An Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023China

room-temperature phosphorescence(RTP)with a dynamic feature endows organic luminescent materials with promising application in optoelectronic ***,it remains a formidable challenge to obtain dynamic RTP ***,we reported a strategy for dynamic RTP via reversible transformation of radicals under external *** gradually disappeared with continuous UV-light irradiation owing to the conversion of NDIA to NDIA^(·-)in NDIA/PVA film,which can be recovered by oxidation with *** the excellent reversibility and repeatability,the potential applications for round-the-clock anticounterfeiting and tag were first *** finding not only outlines a principle to synthesize new RTP materials with dynamic behavior,but also expands the scope of applications of dynamic RTP materials.

关键词： room-temperature phosphorescence radical emission supramolecular self-assembly anti-counterfeiting

Multi-modal anti-counterfeiting and encryption enabled through silicon-based materials featuring pH-responsive fluorescence and room-temperature phosphorescence

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Nano Research 2020年第6期13卷 1614-1619页

作者： Jinhua Wang Bin Song Jiali Tang Guyue Hu Jingyang Wang Mingyue Cui Yao He Laboratory of Nanoscale Biochemical Analysis Institute of Functional Nano and Soft Materials(FUNSOM)and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou215123China

Nano Research volume 13,pages1614–1619(2020)Cite this article 236 Accesses Metrics details Abstract Optical silicon(Si)-based materials are highly attractive due to their widespread applications ranging from electronics to *** is worth noting that while extensive efforts have been devoted to developing fluorescent Si-based structures,there currently exist no examples of Si-based materials featuring phosphorescence emission,severely limiting Si-based wide-ranging optical *** address this critical issue,we herein introduce a kind of Si-based material,in which metal-organic frameworks(MOFs)are in-situ growing on the surface of Si nanoparticles(SiNPs)assisted by microwave *** particular significance,the resultant materials,i.e.,MOFs-encapsulated SiNPs(MOFs@SiNPs)could exhibit pH-responsive fluorescence,whose maximum emission wavelength is red-shifted from 442 to 592 nm when the pH increases from 2 to *** importantly,distinct room-temperature phosphorescence(maximum emission wavelength:505 nm)could be observed in this system,with long lifetime of 215 *** advantages of above-mentioned unique optical properties,the MOFs@SiNPs are further employed as high-quality anti-counterfeiting inks for advanced *** comparison to conventional fluorescence anti-counterfeiting techniques(static fluorescence outputs are generally used,thus being easily duplicated and leading to counterfeiting risk),pH-responsive fluorescence and room-temperature phosphorescence of the resultant MOFs@SiNPs-based ink could offer advanced multi-modal security,which is therefore capable of realizing higher-level information security against counterfeiting.

关键词： silicon nanohybrids pH-responsive fluorescence room-temperature phosphorescence multi-modal anti-counterfeiting

Generation of color-controllable room-temperature phosphorescence via luminescent center engineering and in-situ immobilization

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Chinese Chemical Letters 2023年第7期34卷 193-199页

作者： Licheng Zheng Kai Jiang Jiaren Du Yike Li Zhongjun Li Hengwei Lin International Joint Research Center for Photo-responsive Molecules and Materials School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Materials with controllable luminescence colors are highly desirable for numerous promising applications, however, the preparation of such materials, particularly with color-controllable room-temperature phosphorescence(RTP), remains a formidable challenge. In this work, we reported on a facile strategy to prepare color-controllable RTP materials via the pyrolysis of a mixture containing 1-(2-hydroxyethyl)-urea(H-urea) and boric acid(BA). By controlling the pyrolysis temperatures, the as-prepared materials exhibited ultralong RTP with emission colors ranging from cyan, green, to yellow. Further studies revealed that multiple luminescent centers formed from H-urea, which were in-situ embedded in the B2O3matrix(produced from BA) during the pyrolysis process. The contents of the different luminescent centers could be regulated by the pyrolysis temperatures, resulting in color-tunable RTP. Significantly, the luminescent center engineering and in-situ immobilization strategy not only provided a facile method for conveniently preparing color-controllable RTP materials, but also endowed the materials prepared at relatively lower temperatures with color-changeable RTP features under thermal stimulus. Considering their unique properties, the potential applications of the as-obtained materials for advanced anti-counterfeiting and information encryption were preliminarily demonstrated.

关键词： Carbon dots room-temperature phosphorescence Luminescent center engineering In-situ immobilization Anti-counterfeiting Information security

A facile and green strategy to obtain organic room-temperature phosphorescence from natural lignin

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Science China Chemistry 2022年第6期65卷 1100-1104页

作者： Ruihong Liu Tao Jiang Dongzhi Liu Xiang Ma School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and EngineeringTianjin Engineering Research Center of Functional Fine ChemicalsTianjin UniversityTianjin300354China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

Seeking pure organic functional luminescent materials that are processed from green, low-cost, and sustainable resources remains a challenging but beneficial task. As an abundant natural polymer composed of crosslinked phenol ether units, lignin is a potential source of organic luminescent material because of the presence of extensive aromatic fragments. In the present work, a remarkable afterglow involving room-temperature phosphorescence(RTP) was achieved via simply embedding alkalized lignin into polyvinyl alcohol(PVA) matrix, and an ultralong luminescence lifetime of more than 160 ms was observed. More importantly, our study revealed that small fragments of hydrolyzed lignin(named LA-H) bearing extensive phenolic oxygen anions were the effective luminescent species. When embedded into a PVA matrix, LA-H showed remarkably high luminescence quantum yield and long lifetime of RTP emission compared with those of unprocessed lignin. Additionally, the various phenol oxygen anion moieties endowed LA-H with an excitation-dependent characteristic: the color-tunable RTP could be simply tuned from a maximum emission wavelength of 434–532 nm via altering the excitation wavelength. Thus, the color-tunable afterglow of emissive LA-H could be facilely obtained with a yield up to 38.4% using simple acid hydrolysis of lignin without other complex synthesis procedures. This work opens new avenues in the large-scale preparation of low-cost and sustainable pure organic RTP materials.

关键词： room-temperature phosphorescence color-tunable lignin afterglow

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Ultralong organic room-temperature phosphorescence of electrondonating and commercially available host and guest molecules through efficient Förster resonance energy transfer

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Science China Chemistry 2021年第5期64卷 739-744页

作者： Yeling Ning Junfang Yang Han Si Haozhong Wu Xiaoyan Zheng Anjun Qin Ben Zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSCUT-HKUST Joint Research InstituteAIE InstituteCenter for Aggregation-Induced EmissionSouth China University of Technology(SCUT)Guangzhou 510640China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster Science of Ministry of EducationBeijing Institute of TechnologyBeijing 100081China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&Technology(HKUST)Clear Water BayKowloonHong KongChina

Ultralong organic room-temperature phosphorescence(RTP)materials have attracted tremendous attention recently due to their diverse *** ultralong organic RTP materials mimicking the host-guest architecture of inorganic systems have been exploited ***,complicated synthesis and high expenditure are still inevitable in these ***,we develop a series of novel host-guest organic phosphorescence systems,in which all luminophores are electron-rich,commercially available and *** maximum phosphorescence efficiency and the longest lifetime could reach 23.6%and 362 ms,*** results and theoretical calculation indicate that the host molecules not only play a vital role in providing a rigid environment to suppress non-radiative decay of the guest,but also show a synergistic effect to the guest through Förster resonance energy transfer(FRET).The commercial availability,facile preparation and unique properties also make these new host-guest materials an excellent candidate for the anti-counterfeiting *** work will inspire researchers to develop new RTP systems with different wavelengths from commercially available luminophores.

关键词： room-temperature phosphorescence host-guest system Förster resonance energy transfer commercial luminophore anti-counterfeiting

Organic Host-Guest Materials with Bright Red room-temperature phosphorescence for Persistent Bioimaging

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Chinese Journal of Chemistry 2023年第13期41卷 1575-1582页

作者： Yueyue Si Yeyun Zhao Wenbo Dai Shisheng Cui Peng Sun Jianbing Shi Bin Tong Zhengxu Cai Yuping Dong Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081 China

Organic room-temperature phosphorescence(RTP)materials have attracted immense attention in bioimaging due to their long emission lifetime and large Stokes *** materials with long emission wavelength can improve the penetration depth for ***,the design of red persistent RTP materials is still *** this study,a fused-ring structure has been proposed to effectively decrease the triplet energy level,thus extending the emission wavelength of *** addition,the fused-ring structure exhibits a high molar extinction coefficient(ɛ)and high luminescence efficiency due to the rigid structure.A new class of crystalline hosts(iminodibenzyl,IDB)are developed to stabilize the triplet excitons that are generated from the fused-ring *** maximum RTP wavelength of doping materials can reach 635 nm with a lifetime of 9.35 ***-disperse nanoparticles are successfully prepared for in vivo time-resolved bioimaging,which eliminates the background fluorescence interference from biological *** reveal a delicate design strategy for the construction of long-wavelength emissive RTP materials for high-resolution bioimaging.

关键词： room-temperature phosphorescence Fused-ring systems Long-wavelength emission High-resolution bioimaging Luminescence Nanoparticles

Responsive organic room-temperature phosphorescence materials for spatial-time-resolved anti-counterfeiting

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Chinese Chemical Letters 2024年第11期35卷 475-480页

作者： Jiayin Zhou Depeng Liu Longqiang Li Min Qi Guangqiang Yin Tao Chen Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Material Chemistry and Chemical Engineering Key Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China

Stimulus-responsive room-temperature phosphorescence(RTP)materials have gained significant attention for their important optoelectronic application ***,the fabrication strategy and underlying mechanism of stimulus-responsive RTP materials remain less ***,we present a reliable strategy for achieving pH-responsive RTP materials by integrating poly(vinyl alcohol)(PVA)with carboxylic acid or amino group functionalized terpyridine(Tpy)*** resulting Tpy derivativesbased RTP materials displayed reversible changes in emission color,intensity,and lifetime of both prompt and delayed ***,the RTP emission undergoes a significant diminish upon exposure to acid due to the protonation of Tpy *** advantage of the decent RTP emission and pH-responsiveness of these RTP films,a spatial-time-resolved anti-counterfeiting application is demonstrated as a proof-ofconcept for largely enhancing the security *** study not only provides new prospects for developing smart RTP materials but also promotes the advancement of optical anti-counterfeiting applications.

关键词： room-temperature phosphorescence pH-responsive Hydrogen bonding interactions Spatial-time-resolved anti-counterfeiting Terpyridine

Water-soluble boron carbon oxynitride dots with excellent solid-state fluorescence and ultralong room-temperature phosphorescence

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Nano Research 2020年第12期13卷 3261-3267页

作者： Shenghui Han Gang Lian Xiaoliang Zeng Zhaozhen Cao Qilong Wang Deliang Cui Ching-Ping Wong State Key Lab of Crystal Materials Shandong UniversityJinan250100China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan250100China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia30332USA

Developing metal-free and long lifetime room-temperature phosphorescence(RTP)materials has received tremendous interest due to their numerous potential applications,of which stable triplet-excited state is the core ***,boron carbon oxynitride(BCNO)dots,emitting stable blue fluorescence and green RTP,are reported for the first *** obtained BCNO dots exhibit an unexpected ultralong RTP lifetime of 1.57 s,lasting over 8 s to naked *** effective doping of carbon and oxygen elements in boron nitride(BN)actually provides a small energy gap between singlet and triplet states,facilitating the intersystem crossing(ISC)and populating of triplet *** formation of compact cores via crystallization and effective inter-/intra-dot hydrogen bonds further stabilizes the excited triplet states and reduces quenching of RTP by oxygen at room *** on the water-soluble feature of BCNO dots,a novel advanced security ink is developed toward anti-counterfeiting tag and confidential information *** study extends BCNO dots to rarely exploited phosphorescence fields and also provides a facile strategy to prepare ultralong lifetime metal-free RTP materials.

关键词： boron carbon oxynitride dots room-temperature phosphorescence fluorescence colourless security ink anti-counterfeiting