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Metal–organic frameworks with aggregation-induced emission

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Aggregate

Aggregate 2024年第3期5卷 127-141页

作者： Hang Xu Peng Cheng Key Laboratory of Advanced Energy materials Chemistry(MOE)and Frontiers Science Center for New Organic Matter College of ChemistryNankai UniversityTianjinChina

Aggregation-induced emission(AIE)materials exhibit remarkable emission in the aggregated or solid state while demonstrating minimal emission in dilute *** contrast to conventional luminescent materials,AIE luminogens(AIEgens)offer several advantages in the aggregate state,including high quantum yield,excel-lent photostability,and low background signals,making them highly promising for diverse *** AIEgens into designable metal–organic frame-works(MOFs)enables tunable and well-ordered AIE materials,allowing for precise control over photophysical properties and deeper exploration of AIE *** AIE MOFs have been constructed and investigated,and several reviews focus on their structure design and applications in sensing and *** review highlights the state-of-the-art advancements in AIE MOFs,including mech-anisms,design strategies,and applications in chemical sensing,bioimaging,and disease *** challenges associated with practical applications of AIE MOFs are also addressed,with an emphasis on their large-scale production involved interdisciplinary *** comprehensive review aims at guiding further development of AIE MOFs and promoting their practical applications in analysis,healthcare,and other luminescence relatedﬁelds.

关键词： aggregation-induced emission luminescent materials metal–organic frameworks

An efficient method to synthesize N/O,O-difluoroboron complexes from alkynes

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Green Synthesis and Catalysis 2022年第1期3卷 89-94页

作者： Yanmei Chen Zhehui Liao Tongxiang Cao Shifa Zhu Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Guangdong Youmei Institute of Intelligent Bio-manufacturing Co. LtdFoshan 528000China

A highly efficient redox-and step-economic method to synthesize N,O-and O,O-difluoroboron complexes from alkynes under aqueous condition with HBF_(4) as BF_(2) source has been *** strategy features good yields,broad substrate scope,mild reaction conditions,readily available starting materials and gram-scale ***,these difluoroboron complexes present good fluorescence properties,indicating their potential applications in luminescent materials.

关键词： N,O-Difluoroboron complexes O,O-Difluoroboron complexes Fluorescence luminescent materials

发射峰为875 nm的高热稳定性立方相Sc(PO_(3))_(3):Cr^(3+)荧光粉

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Science China materials 2024年第3期67卷 931-938页

作者：刘乐聂文东吴会杰张景荣梁思思朱浩淼 CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

近红外(NIR)荧光粉转换型发光二极管(pc-LED)具有尺寸小、效率高以及光谱易于调节的特点,在特种照明、传感、微型近红外光谱仪等各领域有很好的应用前景.目前,已报道的发射波长超过850 nm的近红外荧光粉的荧光热稳定性较差.在本项研究中... 详细信息

近红外(NIR)荧光粉转换型发光二极管(pc-LED)具有尺寸小、效率高以及光谱易于调节的特点,在特种照明、传感、微型近红外光谱仪等各领域有很好的应用前景.目前,已报道的发射波长超过850 nm的近红外荧光粉的荧光热稳定性较差.在本项研究中,我们合成了一种立方相结构的Sc(PO_(3))_(3):xCr^(3+)(x=0,1,5,10,12,14,16,18 at%)荧光粉,其具有725–1150 nm的宽发射带,发射峰为875 nm,与之前报道的发射峰超过850 nm的荧光粉相比,其表现出优异的热稳定性,在423 K下,5 at%样品的积分发光强度保留了室温下的73.4%.通过对比研究立方相和单斜相Sc(PO_(3))_(3):Cr^(3+)荧光粉变温X射线衍射,发现立方相荧光粉优异的荧光热稳定性可能归因于高温下较小的键长和键角变化.利用该荧光粉制备的NIR pc-LED在150 mA电流驱动下,产生了26.62 mW的NIR辐射功率.驱动电流为10 mA时,最高电光转换效率为11.87%.这项工作为开发具有优异荧光热稳定性的Cr^(3+)离子掺杂近红外荧光粉提供了思路.

关键词： near infrared phosphor pc-LEDs broadband emission Sc(PO_(3))_(3) luminescent materials

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Ultraviolet-activated long-lived room-temperature phosphorescence from small organic molecule-doped polymer systems

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Science China materials 2022年第8期65卷 2160-2168页

作者： Zhonghao Wang Yan Zheng Yan Su Liang Gao Yinyin Zhu Jie Xia Yongfeng Zhang Chang Wang Xian Zheng Yanli Zhao Chaolong Yang Youbing Li School of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Division of Chemistry and Biological Chemistry School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Long-lived organic room-temperature phosphorescent(RTP)materials have attracted widespread attention because of their fantastic properties and application *** current methods for developing RTP materials are mainly based on the synthesis of new chromophore molecules and crystallization ***,there are great challenges in the preparation of new chromophore molecules and the use of crystalline ***,dynamic stimulus-responsive long-lived RTP systems with various emission colors are realized by doping organic chromophore molecules into polymer matrix prepared from vinyl acetate and acrylic *** UV light irradiation,the growth process of long-lived RTP phenomena can be observed for up to 10 *** particular,the phosphorescence intensity,lifetime,afterglow brightness,and quantum yield of one representative film(P2-M2)increase by 155,262,414,and 8 times after the irradiation,*** unique photophysical phenomena are ascribed to the oxygen consumption characteristics of the polymer matrix under UV ***,the information storage devices are prepared with these RTP *** work provides a strategy for achieving small organic molecule-doped polymer RTP systems that are easy to prepare,low-cost,and widely adaptable.

关键词： information storage luminescent materials phosphorescence growth responsive polymers room temperature phosphorescence

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Synthesis and Photoluminescence of Three Europium (Ⅲ) Ternary Complexes with New Secondary Ligands of Different Structure

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Journal of Rare Earths 2004年第4期22卷 461-465页

作者：袁继兵李嘉航梁万里苏树江石建新龚孟濂 State Key Laboratory of Optoelectronic materials and Technologies School of Chemistry and Chemical Engineering Sun Yat-sen University Guangzhou 510275 China Department of Chemistry Hong Kong Baptist University Hong Kong China Department of Physics Hong Kong Baptist University Hong Kong China

Three new 1,10-phenanthroline derivatives, dipyrido (3,2-f: 2,3-h) quinoxaline (DPQN), imidazo (5,6-f)-(1,10)-phenanthroline (IP) and 3-phenyl-imidazo (5,6-f)-(1,10)-phenanthroline (PIP) were designed and synthesized as a secondary ligand to coordinate with europium (Ⅲ) ion while dibenzoylmethane (DBM) was used as the first ligand. The compositions of the ligands and the europium (Ⅲ) ternary complexes were confirmed by elementary analysis, IR and (()~1H-NMR) spectroscopy. The UV-visible absorption spectra, thermal stability, photoluminescence spectra, quantum yield and fluorescence life time of the Eu(Ⅲ) complexes were investigated. The effect of the structure of the secondary ligand on the photoluminescence of the complexes was discussed. The results show that the synthesized Eu(Ⅲ) complexes are good red-emitiing materials for potential application in fabrication of organic electroluminescence devices.

关键词： inorganic chemistry luminescent materials photoluminescence secondary ligands europium ternary complexes rare earths

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Microstructure and luminescent Properties of Sr2MgSi2O7:Eu2+,Dy3+ Phosphors

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Microstructure and Luminescent Properties of Sr2MgSi2O7:Eu2+...

New Synthetic Method of trans, trans-Styrylstilbene

中国颗粒学会超微颗粒专业委员会第五届年会暨海峡两岸纳米颗粒学术研讨会

作者：季惠明馬東方呂瑩 Key Laboratory for Advanced Ceramics and Machining technology of Ministry of Education School of Materials Science and EngineeringTianjin University

SrMgSiO:Eu,Dy phosphors were synthesized by traditional solid state reaction and sol-gel *** structure and luminescent properties of the phosphors prepared by different methods were discussed using X-ray diffraction (XRD),environment scanning electron microscope(ESEM),long-lasting afterglow intensity decay curve,and photoluminescence(PL) *** results showed that the phosphor via the solid state reaction was obtained by massive agglomerated particles,while nano-sized grains and whiskers were observed in the microstructure of the phosphor via the sol-gel method,and this structure was detected for the first time in Eu and Dy co-doped long lasting phosphorescence *** sample synthesized by sol-gel method presented a broad emission band with the maximum at 468 nm which was a slight red-shifted emission with the respect to the phosphor via the solid state *** was believed that the typical emission of Eu was ascribed to the 4f-4f5d *** phosphor via sol-gel method exhibited a better afterglow property than that of the phosphor obtained by the solid state reaction due to the homogeneous mixture and unique nano-crystalline morphology.

关键词： long afterglow luminescent materials Sr2MgSi2O7 solid state reaction sol-gel method

来源： cnki会议评论

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有机化学 2004年第Z1期24卷 311-页

作者： WANG,Ke-Hu LI,Hong-Xia WANG,Jin-Xian Institute of Chemistry Department of Chemistry Northwest Normal University Lanzhou 730070 Institute of Chemistry Department of Chemistry Northwest Normal University Lanzhou 730070 Institute of Chemistry Department of Chemistry Northwest Normal University Lanzhou 730070

　　Styrylstilbenes and their derivatives are a kind of organic luminescent materials. A variety of synthetic methods have been reported, and their physical properties have been studied. [1,2] A series of para-substit... 详细信息

关键词： luminescent materials physical properties

VUV Spectroscopy of GdPO4∶Eu3+ and GdBO3∶Eu3+

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Journal of Rare Earths 2005年第4期 428-428页

作者： Zimmerer G Luruper Chaussee 149 Institut für Experimentalphysik der Universitt Hamburg Germany 22761 Hamburg

The emission and the excitation spectra of GdPO4∶Eu3+ and GdBO3∶Eu3+ prepared by solid state reaction method were investigated using the synchrotron radiation source of SUPERLUMI station of HASYLAB. The energy transfer between Gd3+ and Eu3+ was discussed with the probability of quantum cutting process. In the excitation spectra monitoring the red emission from Eu3+, the distinct lines corresponding to the intraconfigurational 4f-4f transitions from Gd3+ were observed for both samples, indicating an efficient energy transfer from host Gd3+ ions to the doped Eu3+ ions. The efficient energy transfer is necessary for the quantum cutting process based on the two-step energy transfer from Gd3+ to Eu3+. However, the overlapping of the lines corresponding to Gd3+∶8S7/2→6GJ and the broad excitation band （180～270 nm） due to Eu3+-O2- charge transfer states （CTS） around 200 nm cause excitation energy on （）6GJ levels to dissipate into CTS by direct energy transfer, unfavorable to the cross relaxation energy transfer between Gd3+ and Eu3+, thus unfavorable to the quantum cutting process. With the help of the general rules governing the energy positions of Eu3+-O2-∶CTS, the suggestions concerning searching suitable oxide hosts for Gd3+-Eu3+ quantum cutting were made.

关键词： luminescent materials quantum cutting VUV CTS GdPO4∶Eu3+ GdBO3∶Eu3+ rare earths

VUV Spectroscopy of GdPO_4∶Eu^(3+) and GdBO_3∶Eu^(3+)

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Journal of Rare Earths 2005年第4期23卷 428-428页

作者： Chen Yonghu Liu Bo Shi Chaoshu Zimmerer G Department of Physics University of Science and Technology of China Hefei 230026 China Institut fǖr Experimentalphysik der Universitaet Hamburg Luruper Chaussee 149 22761 Hamburg Germany

The emission and the excitation spectra of GdPO4 ： Eu^3＋ and GdBO3： Eu^3 ＋ prepared by solid state reaction method were investigated using the synchrotron radiation source of SUPERLUMI station of HASYLAB. The energy transfer between Gd^3＋ and Eu^3＋ was discussed with the probability of quantum cutting process. In the excitation spectra monitoring the red emission from Eu^3＋ , the distinct lines corresponding to the intraconfigurational 4f-4f transitions from Gd^3＋ were observed for both samples, indicating an efficient energy transfer from host Gd^3＋ ions to the doped Eu^3＋ ions. The efficient energy transfer is necessary for the quantum cutting process based on the two-step energy transfer from Gd^3＋ to Eu^3＋ . However, the overlapping of the lines corresponding to Gd^3＋：^8S7/2→^6GJ and the broad excitation band （180 - 270 nm） due to Eu^3＋- O^2- charge transfer states （CTS） around 200 nm cause excitation energy on ^6GJ levels to dissipate into CTS by direct energy transfer, unfavorable to the cross relaxation energy transfer between Gd^3＋ and Eu^3＋, thus unfavorable to the quantum cutting process. With the help of the general rules governing the energy positions of Eu^3＋-O^2- ：CTS, the suggestions concerning searching suitable oxide hosts for Gd^3＋-Eu^3＋ quantum cutting were made.

关键词： luminescent materials quantum cutting VUV CTS GdPO4:Eu^3+ GdBO3:Eu^3+ rare earths