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Polarized red, green, and blue light emitting diodes fabricated with identical device configuration using rubbed PEDOT:PSS as alignment layer

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Chinese Physics B 2019年第7期28卷 116-121页

作者： Haoran Zhang Qi Zhang Qian Zhang Huizhi Sun Gang Hai Jing Tong Haowen Xu Ruidong Xia Key Laboratory for organic electronics & information displays(KLOEID) Jiangsu–Singapore Joint Research Center for Organic/Bio Electronics &Information Displays Institute of Advanced Materials(IAM) Nanjing University of Posts and Telecommunications

Polarized red, green, and blue light emitting diodes(LEDs) are successfully fabricated using polyfluorene and its derivatives, namely, poly(9,9-dioctylfluorene)(PFO), poly(9,9-dioctylfluorene-co-benzothiadiazole)(F8BT),and poly(triphenylamine-co-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole-co-benzo[c]thiadiazole-co-9,9-dioctyl-9 Hfluorene)(Red F).Rubbed hole transport layer poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate)(PEDOT:PSS)is employed in the devices as the alignment layer to achieve fully monodomain alignment in all polymer *** F is blended with F8BT to realize the polarized electroluminescence of red light(dichroic ratio ~3.3), despite having no liquid crystallinity *** PFO/F8BT blend to F8BT, higher efficiency of polarized emission is found due to the energy *** the polarized LEDs exhibit pronounced dichroism and efficient polarized emission compared to the non-alignment regular devices.

关键词： organic semiconductors light-emitting devices polymer liquid crystals display devices

Light People:*** D C Bradley(FRS)

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Light(Science & Applications) 2024年第9期13卷 1704-1719页

作者： Ruidong Xia Ying Hu Key Laboratory for organic electronics&information displays(KLOEID) Jiangsu-Singapore Joint Research Center for Organic/Bio Electronics&Information DisplaysInstitute of Advanced Materials(IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing 210023China Executive Management College of CHN ENERGY North District of Future Science CityChangping DistrictNo.7 Binhe AvenueBeijing 102211China

Editorial,The invention of organic light emitting diodes(LEDs)led to enormous excitement in both academe and industry in the late 1980’***,large area solution processability,roll-to-roll printing,low cost,and environmentally friendly are some of the advantages of organic semiconductor materials,which brought a new horizon for *** with the achievement of organic solar cells,transistors,lasers,and amplifiers,this has demonstrated potential applications of organic semiconductors in displays,lighting,solar energy generation,electronics,sensing and imaging,and many aspects of *** an enlightened conversation with Light:Science&Applications,*** Bradley(FRS),a pioneer in the field,shared his deep insights on past,current,and future exciting developments of organic optoelectronic materials and *** particular,he expressed his opinion on the hot topics related to organic optoelectronics research and application,such as the relationship between organic and inorganic semiconductors and the challenge of electrically pumped organic *** a successful scientist,Donal has also been co-founder of several organic optoelectronics innovation companies and research centers and a long-term academic administrator serving as a Head of Department,Centre Director,and Vice-Rector for research at Imperial College,Head of the Mathematical,Physical,and Life Sciences Division at the University of Oxford,Vice-President for research at King Abdullah University of Science and Technology and now Vice-President for research and Innovation at NEOM U and Executive Director of the NEOM Education,research and Innovation *** this interview,we also explore the major roles and events in Donal’s career experience from the invention of the first conjugated polymer LED in the world to the set-up of entrepreneurial companies,from Cambridge to Sheffield,Imperial College,and Oxford,from the UK to overseas,and from the establishment of the Cent

关键词： companies Director Bradley

A Water-soluble Conjugated Polymer for Thiol Detection Based on ＂Tu rn-off＂ Effect

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Chinese Journal of Chemistry 2015年第8期33卷 881-887页

作者： Gaoshan Zeng Jie Li Hao Liang Yan Yuan Xiang Li Chao Yin Zhen Yang Quli Fan Xiaomei Lu Wei Huang Key Laboratory for organic electronics & information displays and lnstitute of Advanced Materials Nanjing University of Posts & Telecommunications Nanjing Jiangsu 210046 China jiangsu-singapore joint research center for organic/bio-electronics & information displays and Institute of Advanced Material Nanjing Tech University Nanjing Jiangsu 211816 China

We investigated a novel water-soluble conjugated polymer （WSCP） for thiol detection based on ＂turn-off＂ ef- fect. This WSCP was modified with poly（ethylene glycol）（PEG） by disulfide linkages to achieve good solubility in aqueous solution （34 mg/mL） and high quantum yield （0.47）. The separation of water-soluble PEG chains from the conjugated backbone induced by the cleavage of the disulfide linkages would lead to a significant decrease of the water solubility and a dramatical fluorescence quenching of the probe. The combined intuitive images and fluores- cence spectrophotometer further confirmed that decreased solubility produced an aggregation of the hydrophobic conjugated backbone. The fluorescence intensity of the probe showed a good linear relationship with glutathione （GSH）（1-200 nmol·L^-1）, and the detection limit was 16 nmol·L^-1. This WSCP probe was confirmed to be a good sensing material with high selectivity to thiols by testing various biological molecules. And this WSCP probe ex- hibited good detection effect to intracellular thiols by testing Hela cells. Considering the good sensitivity and selec- tivity, the probe could be further used in vivo. In conclusion, this conjugated polymer probe made up for the draw- backs of the micromolecue probes and contributed to the development of new probes based on conjugated poly- mers.

关键词： thiols disulfide water-soluble conjugated polymer poly(ethylene glycol)

Synthesis and characterization of amphiphilic graphene

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Science China(Technological Sciences) 2014年第2期57卷 244-248页

作者： DU ZhuZhu AI Wei ZHAO JianFeng XIE LingHai HUANG Wei Centre of Molecular System and organic Devices (CMSOD) Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications jiangsu-singapore joint research center for organic/bio- electronics & information displays and Institute of Advanced Materials Nanjing University of Technology

A simple and effective method for the preparation of amphiphilic graphene(AG)is presented under an organic solvent-free synthetic *** synthetic route first involves a cyclization reaction between carboxylic groups on graphene oxide and the amino groups on 5,6-diaminopyrazine-2,3-dicarbonitrile,and subsequent reduction by *** of UV-vis spectroscopy,Fourier transformed infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),thermogravimetric analysis(TGA)and Raman spectroscopy have confirmed that the covalent functionalization of graphene can be achieved through the formation of imidazo[4,5-b]pyrazine on the graphene *** a result,AG can be successfully dispersed in water and common organic *** work successfully provides a facile and efficient way to fabricate AG and may extend the potential applications of graphene-based materials in nanoelectronic devices,polymer fillers and biological field.

关键词： amphiphilic graphene 5,6-diaminopyrazine-2,3-dicarbonitrile cyclization reaction

Solution-processed copper nanowire flexible transparent electrodes with PEDOT：PSS as binder, protector and oxide-layer scavenger for polymer solar cells

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Nano research 2015年第3期8卷 1017-1025页

作者： Jianyu Chen Weixin Zhou Jun Chen Yong Fan Ziqiang Zhang Zhendong Huang Xiaomiao Feng Baoxiu Mi Yaowen Ma Wei Huang Key Laboratory for organic electronics & information displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications (NUPT) Nanjing 210046 China jiangsu-singapore joint research center for organic/bio-electronics & information displays and Institute of Advanced Materials Nanjing Tech University Nanjing 211816 China

The easy oxidation and surface roughness of Cu nanowire （NW） films are the main bottlenecks for their usage in transparent conductive electrodes （TCEs）. Herein, we have developed a facile and scaled-up solution route to prepare Cu NW-based TCEs by embedding Cu NWs into pre-coated smooth poly（3,4-ethylenedioxythiophene）：poly（styrenesulfonate）（PEDOT：PSS） films on poly（ethylene terephthalate）（PET） substrates. The so obtained Cu NW- PEDOT：PSS/PET films have low surface roughness （-70 nm in height）, high stability toward oxidation and good flexibility. The optimal TCEs show a typical sheet resistance of 15Ω·sq-1 at high transparency （76% at A = 550 nm） and have been used successfully to make polymer （poly（3-hexylthiophene）：phenyl-C61- butyric acid methyl ester） solar cells, giving an efficiency of 1.4%. The overall properties of Cu NW-PEDOT：PSS/PET films demonstrate their potential application as a replacement for indium tin oxide in flexible solar cells.

关键词： copper nanowires poly-(3 4-ethylenedioxythiophene)poly(styrenesulfonate)films flexible transparentelectrodes solution processing organic photovoltaics

Triphenyl Phosphine Oxide and Carbazole-based Polymer Host Materials for Green Phosphorescent organic Light-emitting Diodes

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Chinese Journal of Polymer Science 2017年第5期35卷 611-622页

作者： Hong-ji Jiang Qing-wei Zhang Xu He Xiao-lin Zhang Xin-wen Zhang Key Laboratory of organic electronics and information displays National Jiangsu Synergetic Innovation Center for Organic Electronics and Information Displays Institute of Advanced Materials Nanjing University of Posts and Telecommunications

Four novel polymers, poly（3,6-9-decyl-carbazole-alt-1,3-benzene）（PB13CZ）, poly（3,6-9-decyl-carbazole-alt- bis（4-phenyl）（phenyl） phosphine oxide）（PTPPO38CZ）, poly（3,6-9-decyl-carbazole-alt-2,4-phenyl（diphenyl） phosphine oxide）（PTPPO13CZ） and poly（3,6-9-decyl-carbazole-alt-bis（3-phenyl）（phenyl） phosphine oxide）（PTTPO27CZ） were synthesized, and their thermal, photophysical properties and device applications were further investigated to correlate the chemical structures with the photoelectric performance of bipolar host materials for phosphorescent organic light emitting diodes. All of them show high thermal stability as revealed by their high glass transition temperatures and thermal decomposition temperatures at 5% weight loss. These polymers have wide band gaps and relatively high triplet energy levels. As a result, the spin coating method was used to prepare the green phosphorescent organic light emitting diodes with polymers PTPPO38CZ, PTPPO13CZ and PTTPO27CZ as the typical host materials. The green device of polymer PTPPO38CZ as host material shows electroluminescent performance with maximum current efficiency of 2.16 cd.A-1, maximum external quantum efficiency of 0.7%, maximum brightness of 1475 cd.m-2 and reduced efficiency roll-off of 7.14% at 600 cd.m-2, which are much better than those of the same devices hosted by polymers PTTPO27CZ and PTPPO13CZ.

关键词： Triphenyl phosphine oxide Phosphorescent organic light-emitting diode Thermal stability Triplet energy levels Polymer host materials Electroluminescent performance

SERS-based mercury ion detections:principles,strategies and recent advances

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Science China Chemistry 2016年第1期59卷 16-29页

作者： chunyuan song boyue yang yanjun yang lianhui wang Key Laboratory for organic electronics&information displays Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China

Mercury ion(Hg^(2+)),known as one of the highly toxic and soluble heavy metal ions,is causing serious environmental pollution and irreversible damage to the *** is urgent to develop some rapid and ultrasensitive methods for detecting trace mercury ions in the environment especially drink ***-enhanced Raman scattering(SERS)is considered as a novel and powerful optical analysis technique since it has the significant advantages of ultra-sensitivity and high *** recent years,the SERS technique and its application in the detection of Hg^(2+)have become more prevalent and *** review provides an overall survey of the development of SERS-based Hg^(2+)detections and presents a summary relating to the basic principles,detection strategies,recent advances and current challenges of SERS for Hg^(2+)detections.

关键词： mercury ion surface-enhanced Raman scattering detection strategy turn-on turn-off

Platinum nanoparticles supported MoS2 nanosheet for simultaneous detection of dopamine and uric acid

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Science China Chemistry 2016年第3期59卷 332-337页

作者： Jie Chao Xiaoyan Han Haofan Sun Shao Su Lixing Weng Lianhui Wang Key Laboratory for organic electronics&information displays Institute of Advanced MaterialsNational Syngerstic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing210023China College of Geography and biological information Nanjing University of Posts and TelecommunicationsNanjing210023China

Herein, platinum nanoparticles-decorated molybdenum disulfide （PtNPs@MoS2） nanocomposite has been synthesized via a microwave-assisted hydrothermal method, which was characterized by transmission electron microscopy （TEM） and powder X-ray diffraction （XRD）. This MoSz-based nanocomposite modified glass carbon electrode （PtNPs@MoSz/GCE） exhibited excellent electrocatalytic activity toward dopamine （DA） and uric acid （UA） due to their synergistic effect. Two well-defined oxidation peaks of DA and UA were obtained at PtNPs@MoS2/GCE with a large peak separation of 160 mV （DA-UA）, sug- gesting that the modified electrode could individually or simultaneously analyze DA and AA. Under the optimal conditions, the peak currents of DA and UA were linearly dependent on their concentrations in the range of 0.5-150 and 5-1000 gmol/L with detection limit of 0.17 and 0.98 gmol/L, respectively. The proposed MoSz-based sensor can also be employed to examine DA and UA in real samples with satisfactory results. Therefore, the PtNPs@MoS2 nanocomposite might offer a good possibil- ity for electrochemical sensing and other electrocatalytic applications.

关键词： molybdenum disulfide platinum nanoparticles dopamine uric acid

Recent progress on low dimensional perovskite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 1091-1100页

作者： Lingfeng Chao Ze Wang Yingdong Xia Yonghua Chen Wei Huang Key Laboratory of Flexible electronics(KLOFE)&Institution of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Teeh University(NanjingTech)Nanjing 211816Jiangsu.China Shaanxi Institute of Flexible electronics(SIFE).Northwestern Polytechnical University(NPU) Xi'an 710072ShaanxiChina Key Laboratory for organic electronics&information displays(KLOEID) and Institute of Advanced Materials(IAM).Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina

Low dimensional perovskites have recently attracted much attention due to their vertical growth of crys- talline orientation, excellent film morphology, and long-term humidity, light, and heat stability, How- ever, low dimensional perovskites suffer fl＇om low power conversion efficiency （PCE） with respect to their three dimensional analogues. Therefore, it is imperative to find excellent low-dimensional perovskite materials for improving the PCE. Previous work has demonstrated that bulkier organic molecules, e,g., C6Hs（CH2）2NH3＋（PEA＋）, CH3（CH2）3NH3＋（n-BAT, iso-BA＋）, C2H4NH3 ＋, and polyethylenimine cations （PEI＋）, play an important role in the formation of low-dimensional perovskites. In this review, we review the recent development of low dimensional perovskites for solar cells application in terms of film preparation, photophysics, and stability of perovskites, as well as the related device structure and physics. We have also discussed the future development of low-dimensional perovskites from materials design, fabri- cation processes, and device structure.

关键词： Low dimensional perovskites Perovskite solar cells Stability Bulkier organic molecules