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Chinese Physics B 2014年第8期23卷 548-551页

作者：马健陆启飞王延泽卢志娟孙亮董晓菲王达健 Institute of Materials Physics School of Materials Science and Engineering Tianjin University of Technology Tianjin Key Laboratory for Photoelectronic Materials and Devices Key Laboratory of Display Materials and Photoelectronic Devices (Tianjin University of Technology) Ministry of Education

We report a novel approach to obtaining a classical blue-green excitable CaS：Eu2＋ phosphor with desired red emission by microwave （MW） firing procedure in the absence of adding elemental sulphur. The disturbing effect of MW electro- magnetic field on decomposition of CaSO4 into CaS activated by europium is distinctly observed to give pure host phase without adding any elemental sulphur and carbon. The host phase evolution is observed to be highly dependent on the variation of applied MW power from X-ray diffraction （XRD） patterns and the corresponding photoluminescence （PL）, and a maximum PL intensity at 1100 W of MW power is acquired for the obtained purer host phase. The non-thermal and non-equilibrium effects by MW are revealed to correlate with the interaction between polar structure of the host and applied electromagnetic field. The results demonstrate an optional procedure to prepare this red-emitting phosphor in an effective, environment-friendly and scalable approach for phosphor production in the application of bio-illumination for plant cultivation and artificial photosynthesis.

关键词： red emission calcium sulfide microwave energy

Fluorine-defects induced solid-state red emission of carbon dots with an excellent thermosensitivity

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Chinese Chemical Letters 2021年第11期32卷 3646-3651页

作者： Haizhen Ding Jiahui Xu Lei Jiang Chen Dong Qi Meng Sajid ur Rehman Junfeng Wang Zhishen Ge Vladimir Yu.Osipov Hong Bi School of Chemistry and Chemical Engineering Anhui Key Laboratory of Modern BiomanufacturingAnhui UniversityHefei 230601China High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230601China Ioffe Institute Russian Academy of SciencesSt.Petersburg 194021Russian Federation

Up to date,solid-state carbon dots(CDs)with bright red fluorescence have scarcely achieved due to aggregation-caused quenching(ACQ)effect and extremely low quantum yield in deep-red to near infrared ***,we report a novel fluorine-defects induced solid-state red fluorescence(λ_(em)=676 nm,the absolute fluorescence quantum yields is 4.17%)in fluorine,nitrogen and sulfur co-doped CDs(F,N,S-CDs),which is the first report of such a long wavelength emission of solid-state *** a control,CDs without fluorine-doping(N,S-CDs)show no fluorescence in solid-state,and the fluorescence quantum yield/emission wavelength of N,S-CDs in solution-state are also lower/shorter than that of F,N,S-CDs,which is mainly due to the F-induced defect traps on the surface/edge of F,N,***,the solid-state F,N,S-CDs exhibit an interesting temperature-sensitive behavior in the range of 80-420 K,with the maximum fluorescence intensity at 120 K,unveiling its potential as the temperature-dependent fluorescent sensor and the solid-state light-emitting device adapted to multiple temperatures.

关键词： Carbon dots Fluorine defects Solid-state fluorescence Thermosensitivity red emission

High-efficiency saturated red emission from binuclear cyclo-metalated platinum complex containing 5-(4-octyloxyphenyl)-1,3,4-oxadiazole-2-thiol ancillary ligand in PLEDs

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Science China Chemistry 2013年第8期56卷 1137-1142页

作者： YU JunTing WU XiuGang TAN Hua LIU Yu WANG YaFei ZHU MeiXiang ZHU WeiGuo Key laboratory of Environment-Friendly Chemistry and Application Ministry of Education College of Chemistry Xiangtan University

A novel red-emitting binuclear platinum complex （dfppy）zPtz（C^OXT）z was synthesized and characterized, in which dfppy represents 2-（4＇,6＇-difluorophenyl）pyridinato unit and CsOXT is abbreviated for 5-（4-octyloxyphenyl）-1,3,4-oxadiazole-2-thiol as a bridging ancillary ligand. Its photophysical, electrochemical and electroluminescent characteristics were primarily studied. The made single-emissive-layer （SEL） polymer light-emitting devices using （dfppy）2Ptz（CsOXT）2 as emitter exhibited a satu- rated red emission peaked at 620 nm. The best device performances were obtained in the device at 8 wt% dopant concentration, with a maximum external quantum efficiency of 8.4%, a current efficiency of 4.2 cd/A and brightness of 3228 cd/m~. This work provides an effective approach to obtain high-efficiency red emission through construction of new binuclear platinum complex and its doped SEL devices.

关键词： binuclear platinum complexes red emission electroluminescence oxadiazole polymer light-emitting devices

Polyetherimide functionalized carbon dots with enhanced red emission in aqueous solution for bioimaging

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Chinese Chemical Letters 2022年第8期33卷 4111-4115页

作者： Liming Wang Bingzhe Wang Enshan Liu Yunyang Zhao Bingchen He Chunfei Wang Guichuan Xing Zikang Tang Yinning Zhou Songnan Qu Institute of Applied Physics and Materials Engineering University of MacaoMacao SARChina Cancer Centre and Centre of Reproduction Development and AgingFaculty of Health SciencesUniversity of MacaoMacao SARChina

red emissive carbon dots(CDs)are highly desired for biological ***,serious luminescence quenching of red emissive CDs in aqueous solution greatly hinders their application in high performance biological ***,we reported a facile strategy to realize enhanced red emission of CDs in aqueous solution by surface modification with polyetherimide(PEI)via microwave heating *** photoluminescence quantum yield(PLQY)of 25%was realized from the PEI functionalized CDs(CDs@PEI)in aqueous *** proposed PEI functionalization strategy not only protects the red emission against water molecules quenching,but also reverses the surface charges from negativity to positivity to promote cellular uptake of CDs,leading to clear cell imaging in red fluorescence *** important,CDs@PEI exhibits much better photostability than commercial red emissive dye(MitoT racker red)in cell fluorescent *** application of CDs@PEI on fast staining of cells for clonogenic assay has also been demonstrated.

关键词： Carbon dots(CDs) Biological imaging red emission Surface passivation Microwave heating

TCNQ-based organic cocrystal integrated red emission and n-type charge transport

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Frontiers of Optoelectronics 2022年第2期15卷 73-82页

作者： Mengjia Jiang Shuyu Li Chun Zhen Lingsong Wang Fei Li Yihan Zhang Weibing Dong Xiaotao Zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China Institute of Molecular Aggregation Science Tianjin UniversityTianjin 300072China Key Laboratory of Resource Chemistry and Eco-Environmental Protection in Qinghai-Tibet Plateau School of Chemistry and Chemical EngineeringQinghai Minzu UniversityXining 810007China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

Simultaneously realizing the optical and electrical properties of organic materials is always ***,a convenient and promising strategy for designing organic materials with integrated optoelectronic properties based on cocrystal engineering has been put *** selecting the fluorene(Flu)and the 7,7′,8,8′-tetracyanoquinodimethane(TCNQ)as functional constituents,the Flu-TCNQ cocrystal prepared shows deep red emission at 702 nm,which is comparable to the commercialized red quantum *** highest electron mobility of organic field-effect transistor(OFET)based on Flu-TCNQ is 0.32 cm^(2)V^(−1)s^(−1).Spectroscopic analysis indicates that the intermolecular driving force contributing to the co-assembly of Flu-TCNQ is mainly charge transfer(CT)interaction,which leads to its different optoelectronic properties from constituents.

关键词： Organic cocrystal Charge transfer(CT) Integrated optoelectronic properties red emission n-type charge transport

A Stable red emission in Polymer Light-Emitting Diodes based on Phenothiazine Derivative

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A Stable Red Emission in Polymer Light-Emitting Diodes based...

Synthesis and enhanced photoluminescence properties of red emitting divalent ion(Ca^(2+))doped Eu:Y_(2)O_(3)nanophosphors for optoelectronic applications

2007亚洲光电子会议LED材料与器件分会场

作者： Huayu Cao a Zhijian Chen a Yingliang Liu a Jianghui Li b Shaokui Cao b Lixin Xiao a Shengang Xu b Qihuang Gong a a State Key Laboratory for Artificial Microstructures & Mesoscopic Physics Department of Physics Peking University Beijing 100871 PR China b School of Materials Science & Engineering Zhengzhou University Zhengzhou 450052 PR China

A novel soluble phenothiazine-based derivative, poly（3, 7-divinylene-N-octyl-phenothiazine 2, 3-diethylquinoxaline-5,8-diyl）（PQDN）, is synthesized for application in red light-emitting diodes. PQDN was characterized by the measurements of cyclic voltammetry （CV）, absorption and photoluminescence （PL） spectra. The band gap （Eg） was determined to be 1.89 eV. The smaller band gap suggested that the polymer is a good candidate for red electroluminescent materials. Polymer light-emitting diodes （PLEDs） with double-layer configuration of indium tin oxide （ITO） / （poly-ethylenedioxythiophene）:poly（styrene sulfonate）（PEDOT:PSS） / PQDN: poly（N-vinylcarbazole）（PVK）（100:0, 80:20, 60:40, and 20:80 wt.%） / Mg:Ag were fabricated. The electroluminescent （EL） property was studied in details. In order to improve the EL performance further, the devices were thermally annealed at 100oC for one hour under the protection of nitrogen. Luminance is increased obviously. EL peak wavelength and the Commision International de L’Eclairage （CIE） coordinates are unaltered and located in red region with the increase of the operating voltages,.

关键词： Phenothiazine red emission electroluminescence

来源： cnki会议评论

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Journal of Rare Earths 2022年第8期40卷 1187-1198页

作者： Arpita Dwivedi Monika Srivastava Ankur Dwivedi Amit Srivastava Anurag Mishra S.K.Srivastava Department of Physics Institute of ScienceBanaras Hindu University(BHU)Varanasi221005India School of Materials Science and Technology Indian Institute of Technology(BHU)Varanasi221005India Department of Mining Engineering Indian Institute of Technology(BHU)Varanasi221005India Department of Physics TDPG College VBS Purvanchal UniversityJaunpur222001India

This work presents the synthesis of Y_(2)O_(3):Eu^(3+),χCa^(2+)(χ=0 mol%,1 mol%,3 mol%,5 mol%,7 mol%,9 mol%,11 mol%)nanophosphors with enhanced photoluminescence properties through a facile solution combustion method for optoelectronic,display,and lighting *** X-ray diffraction(XRD)patterns of the proposed nanophosphor reveal its structural properties and crystalline *** transmission electron microscope(TEM)results confirm the change in the shape of the particle and aggregation of particles after co-doping with Ca^(2+).Fourier transform infrared spectroscopy(FTIR)and Raman vibrations also confirm the presence of Y-O vibration and subsequently explain the crystalline nature,structural properties,and purity of the *** the synthesized nanophosphors samples emit intense red emission at 613 nm(~5D_(0)→~7 F_(2))under excitation with 235,394 and 466 nm wavelengths of Eu^(3+)*** photoluminescence(PL)emission spectra excited with 235 nm illustrate the highest emission peak with two other emission peaks excited with 466 and 394 nm that is 1.4 times higher than 466 nm and 1.9 times enhanced by 394 nm wavelength,*** emission intensity of Y_(2)O_(3):Eu^(3+),χCa^(2+)(5 mol%)is increased 8-fold as compared to Eu:Y_(2)O_(3).Doping with Ca^(2+)ions enhances the emission intensity of Eu:Y_(2)O_(3)nanopho sphors due to an increase in energy transfer in Ca^(2+)→Eu^(3+)through asymmetry in the crystal field and by introduction of radiative defect centers through oxygen vacancies in the yttria *** is also observed that the optical band gap and the lifetime of the~5D_(0)level of Eu^(3+)ions in Y_(2)O_(3):Eu^(3+),xCa^(2+)nanophosphor sample gets changed with a doping conce ntration of Ca^(2+)*** also reveals high thermal stability and quantum yield as estimating activation energy of 0.25 eV and 81%,***,CCT,and color purity values(>98%)show an improved red-emitting nanophosphor in the warm region of light,which m

关键词： red emission Photoluminescence(PL) Y_(2)O_(3):Eu^(3+),xCa^(2+) Rare earths Nanophosphors LEDs

red phosphorescent organic light-emitting diodes based on a novel host material with thermally activated delayed fluorescent properties

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Science China Chemistry 2016年第6期59卷 684-691页

作者： Yilang Li Dongdong Zhang Yunge Zhang Minghan Cai Lian Duan Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 China

High cost of phosphors and significant efficiency roll-off at high brightness are the two main factors that limit the wide application of phosphorescent organic light-emitting diodes （PHOLEDs）. Efforts have been paid to find ways to reduce the phosphors＇ concentration and efficiency roll-off of PHOLEDs. In this work, we reported red emission PHOLEDs with low dopant concentration and low efficiency roll-off based on a novel host material 2,4-biscyanophenyl-6-（12-phenylindole[2,3-a]carbazole-ll-yl）-1,3,5-triazine （BCPICT）, with thermally activated delayed fluorescent （TADF） properties. The device with 1.0% dopant concentration displayed a maximum external quantum efficiency of 10.7%. When the dopant concentration was increased to 2.0%, the device displayed a maximum external quantum efficiency of 10.5% and a low efficiency roll-off of 5.7% at 1000 cd/m^2.

关键词： phosphorescent organic light-emitting diodes red emission efficiency roll-off thermally activated delayed fluorescence

Bright red Organic Electroluminescent Devices Based on a Soluble Rare Earth Complex Eu(TTA)_3 Phen

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Chemical Research in Chinese Universities 1998年第3期14卷 28-31页

作者： LI Bin MA Dong ge ZHANG Hong jie ZHAO Xiao jiang NI Jia zuan FU Chun yan Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022 Songliao River Valley Water Environmenta l Research Institute Changchun130021

An Electroluminescent device with PVK film doped with Eu(TTA) 3 Phen and PBD was fabricated. The device structure of glass substrate/indium tin oxide/PPV/PVK∶ Eu(TTA) 3 Phen∶PBD/Alq 3/Al was employed. A sharply... 详细信息

关键词： Electroluminescence Europium complex red emission Doping

Si/Al order and texture orientation optimization of red-emitting Mg_(2)Al_(4)Si_(5)O_(18):Eu^(2+)ceramics for laser phosphor display

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Journal of Materiomics 2024年第5期10卷 1137-1143页

作者： Weibin Chen Yuzhen Wang Gaochao Liu Yongsheng Sun Zhiguo Xia State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou510641China School of Physics and Optoelectronics South China University of TechnologyGuangzhou510641China

Laser phosphor display technology plays an important role in advanced display projection;however,it is a challenge in maintaining excellent color accuracy under high brightness due to the lack of red ***,red-emitting Mg_(2)Al_(4)Si_(5)O_(18):Eu^(2+)ceramics as the phosphor wheel have been optimized in chemical compositions and texture *** textured Mg_(2)Al_(4)Si_(5)O_(18):Eu^(2+)ceramics have high transparency and spot limiting ability,accordingly,the ceramic wheel outputs 1,184 lm of ultra-bright red light under 50 W/mm^(2) laser power ***,the red spectral utilization(over 600 nm)of textured Mg_(2)Al_(4)Si_(5)O_(18):Eu^(2+)ceramics is 2.17 times that of traditional Y_(3)Al_(5)O_(12):Ce^(3+)phosphor *** red-emitting textured Mg_(2)Al_(4)Si_(5)O_(18):Eu^(2+)cordierite ceramic herein enables an improved light-color saturation experience,and it is potential in the next-generation laser phosphor display applications.

关键词： Luminescent materials Rare earth materials Textured ceramic red emission Laser phosphor display