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Nano Research 2013年第10期6卷 752-757页

作者： Kilian Mergenthaler Azhar Iqbal Jesper Wallentin Sebastian Lehmann Magnus T. Borgstrom Lars Samuelson Arkady Yartsev Mats-Erik Pistol Solid State Physics/The Nanometer Structure Consortium Lund University P. O. Box 118 SE-22100 Lund Sweden Division of Chemical Physics Lund University P O. Box 118 SE-22100 Lund Sweden

Realizing photon upconversion in nanostructures is important for many next- generation applications such as biological labelling, infrared detectors and solar cells. In particular nanowires are attractive for optoelectronics because they can easily be electrically contacted. Here we demonstrate photon upconversion with a large energy shift in highly n-doped InP nanowires. Crucially, the mechanism responsible for the upconversion in our system does not rely on multi-photon absorption via intermediate states, thus eliminating the need for high photon fluxes to achieve upconversion. The demonstrated upconversion paves the way for utilizing nanowires--with their inherent flexibility such as electrical contactability and the ability to position individual nanowires--for photon upconversion devices also at low photon fluxes, possibly down to the single photon level in optimised structures.

关键词： nanowires photon upconversion photoluminescence indium phosphide

Chiral self-assembly regulated photon upconversion based on triplet-triplet annihilation

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Chinese Chemical Letters 2019年第11期30卷 1923-1926页

作者： Xujin Qin Jianlei Han Dong Yang Wenjie Chen Tonghan Zhao Xue Jin Peipei Guo Pengfei Duan School of Chemistry and Life Science Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and Technology(NCNST)Beijing 100190China

photon upconversion(UC)based on triplet-triplet annihilation(TTA)in quasi-solid or solid state has been attracting much research interest due to its great potential *** get effective UC,precisely controlled donor-acceptor interaction is vitally *** self-assembly provides a powerful approach for sophisticated regulation of molecular *** we report a chiral self-assembly controlled TTA-UC system composed of chiral acceptor and achiral *** is found that racemic mixture of acceptors could form straight fibrous nanostructures,which show strong UC emission,while chiral assemblies for homochiral acceptors emit weak upconverted *** racemic assemblies allow efficient triplet-triplet energy transfer(TTET)and further realize efficient UC emission,while the homochiral assemblies from chiral acceptor produce twisted nanostructures,suppressing efficient triplet energy transfer and *** establishment of such chiral self-assembly controlled UC system highlights the potential applications of triplet fusion in optoelectronic materials and provides a new perspective for designing highly effective UC systems.

关键词： photon upconversion Triplet Self-assembly Chirality Organogel

Photoswitchable photon upconversion from Turn-on Mode Fluorescent Diarylethenes

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CCS Chemistry 2021年第1期3卷 665-674页

作者： Jianlei Han Jian Zhang Tonghan Zhao Minghua Liu Pengfei Duan CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and Technology(NCNST)Beijing 100190 College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of ShandongKey Laboratory of Molecular and Nano ProbesMinistry of EducationInstitute of Molecular and Nano ScienceShandong Normal UniversityJinan 250014 Beijing National Laboratory for Molecular Science CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049

photon upconversion(UC)is one kind of anti-Stokes shift process,which generally requires a combination of two or more low-energy photons to produce one high-energy ***,another interesting anti-Stokes process,namely,single-photon-absorption-based upconversion(SPA-UC),can take place by exciting thermally excited vibrational-rotational energy levels of ground state to the first level of excited *** phenomenon is less involved in organic systems due to the limitation of appropriate ***,for the first time,we have demonstrated a series of turn-on mode fluorescent diarylethenes,including Thiophene-and p-alkoxybromo-substituted phenyl-substituted derivatives(DAES and DAEC4),which exhibited SPA-UC phenomenon in the closed-ring *** anti-Stokes shift of 0.36 eV was observed in these molecules,which was the highest value accessible in such UC systems.A relatively high quantum efficiency(13.5%)was evaluated through a relative method by using methylene blue as a ***-assisted or hot band absorption was in charge of the achievement of ***,the upconverted emission could be switched on/off by cyclization and cycloreversion reaction,regulated by UV–visible ***,this unique finding of the SPA-UC phenomena in photoswitchable diarylethenes might enrich the development of new molecular engineering strategies for designing photofunctional materials.

关键词： photon upconversion photochromism diarylethene single-photon absorption fluorescence

Triplet−Triplet Annihilation-Based photon upconversion with a Macrocyclic Parallel Dimer

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Precision Chemistry 2024年第10期2卷 539-544页

作者： Catherine H.Mulyadi Masanori Uji Bhavesh Parmar Kana Orihashi Nobuhiro Yanai Department of Applied Chemistry Graduate School of EngineeringKyushu UniversityNishi-kuFukuoka 819-0395Japan Department of Chemistry Graduate School of ScienceThe University of TokyoBunkyo-kuTokyo 113-0033Japan CREST JSTKawaguchiSaitama 332-0012Japan

The integration of multiple chromophore units into a single molecule is expected to improve the performance of photon upconversion based on triplet−triplet annihilation(TTA-UC)that can convert low energy photons to higher energy photons at low excitation *** this study,a macrocyclic parallel dimer of 9,10-diphenylanthracene(DPA)with a precisely parallel orientation,named MPD-2,is synthesized,and its TTAUC properties are ***-2 shows a green-to-blue TTA-UC emission in the presence of a triplet sensitizer,platinum octaethylporphyrin(PtOEP).Compared to monomeric DPA,MPD-2 results in an enhancement of the spin statistical factor of TTA and a decrease in the excitation light intensity due to the intramolecular TTA *** obtained structure−property relationship provides important information for the further improvement of TTA-UC properties.

关键词： photon upconversion triplet−triplet annihilation macrocyclic parallel dimer spin statistical factor anthracene

Let the light be a guide:Chromophore communication in metalorganic frameworks

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Nano Research 2021年第2期14卷 338-354页

作者： Corey R.Martin Preecha Kittikhunnatham Gabrielle A.Leith Anna A.Berseneva Kyoung Chul Park Andrew B.Greytak Natalia B.Shustova Department of Chemistry and Biochemistry University of South CarolinaColumbia631 Sumter SteetSouth Carolina 29208USA

The photonic characteristics of chromophore-containing metal-organic frameworks(MOFs)have led to extensive photophysical studies in an effort to capitalize on the potency of precisely controlled chromophore *** examples have laid the foundation that demonstrates how photophysical properties of chromophores can be manipulated by tuning their communications(interactions)through integration within a MOF *** main focus of this review is on harnessing the versatile MOF platform to accentuate the photophysical properties of integrated *** particular,this review will highlight chromophore dynamics that enhance,alter,or tune the photoluminescence response of single-and multi-chromophore-containing scaffolds,as well as alignment-guided anisotropic *** upon this groundwork,utilization of a hybrid crystalline motif can induce preferential orientation of chromophores resulting in enhanced communication and tailored behavior compared to randomly oriented emissive ***,frameworks that produce upconverted emission via sensitized triplet-triplet annihilation(sTTA),excited-state absorption(ESA),energy transfer upconversion(ETU),multi-photon absorption(MPA),or second-harmonic generation(SHG)can invoke dynamic control of material properties using photochromic linkers and will be discussed herein with a focus on the effects of chromophore *** within a framework is a vehicle tofuse chromophores into solid-state platforms,opening an avenue for chromophore utilization in applications such as portable electronics that require solids or thin *** those reasons,the design of chromophore-containing MOFs with desirable properties that rely on the alignment and communication of hundreds of chromophores within a single platform is a pressing demand for the development of futuristic technologies.

关键词： chrom ophores photophysics photon upconversion photochromism anisotropic photolum inescence optoelectronics

Controlling upconversion through interfacial energy transfer(IET):Fundamentals and applications

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Journal of Rare Earths 2020年第5期38卷 474-482页

作者： Bo Zhou Qiqing Li Long Yan Qinynuan Zhang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniquesand Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510641China

photon upconversion has received substantial attention owing to its great promise in broad applications from bioimaging to other frontier fields like display,upconversion laser,information security and anticounterfeiting.A smart control and manipulation of the upconversion luminescence has always been a key topic,however,to date the most efficient mechanism for upconversion nanoparticles remains the energy transfer upconversion and recently reported energy migration mediated ***,we found that the interfacial energy transfer(IET)is also an efficient approach for enabling and tuning photon upconversion of lanthanide ***,it can be used for the mechanistic understanding of the interionic interactions such as energy transfer and energy migration on the *** this review,the recent advances of the research on the IET are summarized,the principles for designing IET process and typical examples are discussed together with its applications in both mechanistic research and frontier information *** challenges and perspectives for future research are also commented.

关键词： photon upconversion Interfacial energy transfer Core-shell nanostructure Rare earth ions

Triplet-triplet annihilation upconversion materials as electrophoretic inks

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Chinese Chemical Letters 2024年第3期35卷 439-442页

作者： Qiaoyu Zhang Guiwen Luo Jinping Chen Tianjun Yu Rui Hu Guoqiang Yang Yi Zeng Yi Li Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Luminescent materials that can be reversibly switched by electric field stimulation are attractive since the potential application for optoelectronic *** we report a triplet-triplet annihilation upconversion(TTA-UC)system with electrophoretic response which is developed as the electrophoretic *** TTA-UC system consists of an ionic derivative of 9,10-diphenyl anthracene(DPA)as the annihilator and Pt(II)octaethylporphyrin(PtOEP)as the *** applying an electric field,migration and enrichment of positively charged DPA derivatives towards the cathode results in a 20%enhancement of TTA-UC.A quasi-solid film for electrically writing is made using the electrophoretic TTA system as the ink and a platinum electrode as a *** prototype of TTA-UC ink demonstrates unique luminescence functions upon electrically writing and erasing,providing a promising strategy to develop electronic devices for display,information storage and encryption.

关键词： Triplet-triplet annihilation photon upconversion Electrophoresis Electrophoretic ink Luminescence display