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Taming quantum dots’nucleation and growth enables stable and efficient blue-light-emitting devices

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Photonics Research 2022年第10期10卷 2359-2365页

作者： ZHIWEI MA JUNXIA HU LIPING TANG BINGBING LYU Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory for Special Functional Materials of the Ministry of Education Henan UniversityKaifeng 475004China School of Information Engineering Xinyang Agriculture and Forestry UniversityXinyang 464000China Department of Physics South University of Science and TechnologyShenzhen 518055China

Controlling quantum dots’emission,nanostructure,and energy level alignment to achieve stable and efficient blue emission is of great significance for electroluminescence devices but remains a challenge.Here,a series of blue ZnCdSeS/ZnS quantum dots was optimized in preparation by taming their nucleation and growth kinetics.Controlling anion precursor reactive properties to modulate quantum dots’nucleation and growth tailors their alloy core and continuous gradient energy band nanostructure.These results not only elevate the thermal stability of blue quantum dots but also further enhance the injection/transportation of carriers and improve the radiative recombination efficiency in the device.The blue ZnCdSeS/ZnS quantum dots applied in light-emitting devices show superior performance,including maximum current efficiency and external quantum efficiency of,respectively,8.2 cd/A and 15.8%for blue,2.6 cd/A and 10.0%for blue-violet,and 10.9 cd/A and 13.4%for sky-blue devices.The blue and sky-blue devices exhibit lifetimes of more than 10,000 h.The proposed methodology for tailoring quantum dots is expected to pave new guidelines for further facilitating visible optoelectronic device exploration.

关键词： quantum blue enable

Effect of Co(Ⅱ) dopant on the removal of Methylene blue by a dense copper terephthalate

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Journal of Environmental Sciences 2019年第7期31卷 68-79页

作者： Chompoonoot Nanthamathee Division of Chemistry Department of Science Walailak University

In this research, for the first time, a series of Co(Ⅱ) doped copper terephthalate(Co X-Cu BDC,where X is doping percentage) were successfully synthesized via solvothermal method and were tested for dye removal application. The physical properties of Co X-CuBDC were studied by several techniques including X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), energy-dispersive spectroscopy(EDS), thermogravimetric analysis(TGA)and Brunauer–Emmett–Teller(BET) surface area analysis. The incorporation of Co(Ⅱ) dopant leads to isomorphic substitution of Cu(II) in the CuBDC framework with the maximum doping percentage of 22. Doping and parent MOFs which are non-porous were used for removal of Methylene blue(MB) from aqueous solution. Adsorption capacity of Co22-CuBDC and CuBDC are 52 and 58 mg/g, respectively, both of which are higher than the adsorption capacity recorded from several high porosity MOFs. Adsorption kinetic studies indicate that adsorption process follows pseudo-second order model while the adsorption mechanism is dominated by electrostatic attraction. Overall, even though these materials show non-porous characteristic,it can be used effectively in wastewater treatment application.

关键词： Mixed-metal MOFs Methylene blue adsorption Wastewater treatment Pseudo-second order model Adsorption kinetics

One-step synthesis of N-doped metal/biochar composite using NH_3-ambiance pyrolysis for efficient degradation and mineralization of Methylene blue

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Journal of Environmental Sciences 2019年第4期31卷 29-41页

作者： Md Manik Mian Guijian Liu Balal Yousaf Biao Fu Rafay Ahmed Qumber Abbas Mehr Ahmed Mujtaba Munir Liu Ruijia CAS Key Laboratory of Crust-Mantle Materials and the Environments School of Earth and Space SciencesUniversity of Science and Technology of China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences

A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles(NPs)were produced through single-step pyrolysis of FeCl_3–Ti(OBu)_4 laden agar biomass under NH_3 environment.The physiochemical properties of composites were characterized thoroughly.It has found that heating temperature and N-doping through NH_3-ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites.The catalytic activities of composites were measured by degradation of Methylene blue(MB)in the presence or absence of H_2O_2 and visible-light irradiation.Our best catalyst(N–TiO_2–Fe_3O_4-biochar)exhibits rapid and high MB removal competency(99.99%)via synergism of adsorption,photodegradation,and Fenton-like reaction.Continuous production of O_2U^-and UOH radicles performs MB degradation and mineralization,confirmed by scavenging experiments and degradation product analysis.The local trap state Ti^(3+),Fe_3O_4,and N-carbon of the catalyst acted as active sites.It has suggested that the Ti^(3+)and N-doped dense carbon layer improve charge separation and shuttle that prolonged photo-Fenton like reaction.Moreover,the catalyst is highly stable,collectible,and recyclable up to 5 cycles with high MB degradation efficiency.This work provides a new insight into the synthesis of highly visible-light sensitized biocharsupported photocatalyst through NH_3-ambiance pyrolysis of NPs-laden biomass.

关键词： Biochar-supported photocatalyst N–TiO2–Fe3O4-biochar NH3-ambiance pyrolysis Methylene blue Photocatalysis

Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y(y≤0.08) based on triplet-triplet annihilation

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Science Bulletin 2019年第11期64卷 774-781页

作者： Ling Peng Jing-Wen Yao Mei Wang Lin-Ye Wang Xiao-Lan Huang Xin-Feng Wei Dong-Ge Ma Yong Cao Xu-Hui Zhu State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology (SCUT)

It has been challenging to develop deep blue organic molecular fluorescent emitters with CIE y(y≤0.08)based on triplet-triplet annihilation(TTA). Here, we report facilely available dianthracenylphenylenebased emitters, which have a 3,5-di(4-t-butylphenyl)phenyl moiety at the one end and 4-cyanophenyl or 3-pyridyl at the other end, respectively. Both fluorophores show a high glass transition temperature of over 220℃ with a thermal decomposition temperature of over 430℃ at an initial weight loss of1%. The preliminary characterizations of the organic light-emitting diodes(OLEDs) that utilized these nondoped emitters provided high EQEs of 4.6%à5.9% with CIE coordinates(0.15, 0.07–0.08). The analysis of the EL transient decay revealed that TTA contributed to the observed performance. The results show that the new emitters are attractive as a potential TTA-based host to afford stable deep blue fluorescent OLEDs.

关键词： Anthracene Deep blue emission Fluorescence Organic light-emitting diodes Triplet-triplet annihilation

Prussian blue nanosphere-embedded in situ hydrogel for photothermal therapy by peritumoral administration

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Acta Pharmaceutica Sinica B 2019年第3期9卷 604-614页

作者： Jijun Fu Bo Wu Minyan Wei Yugang Huang Yi Zhou Qiang Zhang Lingran Du The Fifth Affiliated Hospital of Guangzhou Medical University Guangzhou Medical UniversityGuangzhou510700China Key Laboratory of Molecular Target&Clinical Pharmacology School of Pharmaceutical SciencesGuangzhou Medical UniversityGuangzhou511436China Center of Pharmaceutical Research and Development School of Pharmaceutical SciencesGuangzhou Medical UniversityGuangzhou511436China

To establish an injectable hydrogel containing Prussian blue(PB) nanospheres for photothermal therapy against cancer, PB nanospheres were prepared by one-pot synthesis and the thermosensitive Pluronic F127 was used as the hydrogel matrix. The PB nanospheres and the hydrogel were characterized by shape, particle size, serum stability, photothermal performance upon repeated 808 nm laser irradiation, as well as the rheological features. The effect of the PB nanospheres and the hydrogel were evaluated qualitatively and quantitatively in 4T1 mouse breast cancer cells. The retention,photothermal efficacy, therapeutic effects and systemic toxicity of the hydrogel were assessed in a tumor-bearing mouse model. The PB nanospheres had a diameter of about 150 nm and exhibited satisfactory serum stability, photo-heat convert ability and repeated laser exposure stability. The hydrogel encapsulation did not negatively influence the above features of the photothermal agent. The nanospherecontaining hydrogel showed a phase transition at body temperature and, as a result, a long retention time in vivo. The photothermal agent-embedded hydrogel displayed promising photothermal therapeutic effects in the tumor-bearing mouse model with little-to-no systemic toxicity after peritumoral administration.

关键词： Prussian blue Nanospheres Hydrogel Thermosensitive Injectable In situ Photothermal

Diversity-oriented synthesis of blue emissive nitrogen heterocycles and their conjugation with carbon nano-onions

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Frontiers of Chemical Science and Engineering 2020年第1期14卷 76-89页

作者： Viviana Maffeis Lisa Moni Daniele Di Stefano Silvia Giordani Renata Riva Nano Carbon Materials Istituto Italiano di Tecnologia(IIT)10144 TorinoItaly Department of Chemistry and Industrial Chemistry University of Genova16146 GenovaItaly School of Chemical Sciences Dublin City UniversityDublin 9Ireland Department of Pharmacy University of Genova16147 GenovaItaly

The search for new fluorescent molecules for possible applications as functional p-electron systems and their conjugation with different nanomaterials is nowadays of paramount importance to broaden the availability of materials with different properties.Herein we present a diversity-oriented approach to heterocyclic luminophores based on a multicomponent Ugi reaction followed by a Pd-mediated cascade sequence.The new molecules are coupled to carbon nano-onions,and hybrid systems represent the first example of blue emitters conjugated with these carbon nanoparticles.

关键词： carbon nano-onions multicomponent reactions blue emitters fluorescence isoquinolines

Pulmonary embolism during pregnancy in a case of blue rubber bleb nevus syndrome

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Chinese Medical Journal 2019年第12期132卷 1499-1501页

作者： Yan-Li Liu Yan-Ping Jiang Juan Du Department of Obstetrics Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510080China

To the Editor:blue rubber bleb nevus syndrome (BRBNS) is a rare systemic vascular disorder characterized by multiple venous malformations involving many organs.BRBNS can occur in various organs,but the most frequently involved organs are the skin and gastrointestinal tract.Gastrointestinal lesions of BRBNS can cause acute or chronic bleeding and anemia.[1] Only several case reports of pregnant women with BRBNS could be found in the current database and most of them were complicated by hemorrhage of the gastrointestinal tract.We report a case of BRBNS during pregnancy that suffered from severe pulmonary embolism (PE) and was successfully resuscitated.

关键词： Pulmonary embolism pregnancy blue rubber bleb nevus syndrome

Dye removal by eco-friendly physically cross-linked double network polymer hydrogel beads and their functionalized composites

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Journal of Environmental Sciences 2019年第4期31卷 81-91页

作者： Yan Kong Yuan Zhuang Zhiyong Han Jianwei Yu Baoyou Shi Kun Han Haotian Hao Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of Sciences College of Petrochemical Engineering Lanzhou University of Technology University of Chinese Academy of Sciences

Hydrogels have attracted large attention in wastewater treatment fields due to their low-cost and good interaction with pollutants,among which novel double network hydrogel is an outstanding class.To expand the application of double network hydrogel in water treatment,in this study,eco-friendly physically cross-linked double network polymer hydrogel beads(DAP)are prepared and studied in depth on the mechanism of Methylene blue(MB)adsorption;and then the polymer hydrogels are further functionalized by inorganic materials.MB adsorption on DAP favors alkaline condition which is due to the increase of electrostatic attraction and adsorption site,and it reaches equilibrium within 10 hr,which is faster than that of the single network hydrogel beads(SAP).Through thermodynamics study,the process shows to be an exothermic and spontaneous process.The adsorption isotherms are well fitted by Langmuir model,with a maximum monolayer adsorption capacity of 1437.48 mg/g,which is larger than SAP(1255.75 mg/g).After being functionalized with common inorganic materials including activated carbon,Fe_3O_4and graphene oxide(GO),the composites show to have larger pore sizes and have obvious increases in adsorption capacity especially the one contains GO.Then the composites contains Fe_3O_4are used as heterogeneous Fenton catalyst which shows to have excellent performance in MB degradation.The results indicate the potential of polymer double network to be functionalized in environmental areas.

关键词： Adsorption Alginate Poly(vinyl alcohol) Hydrogel Methylene blue

Bile salt induced solubilization of methylene blue: Study on methylene blue fluorescence properties and molecular mechanics calculation

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Journal of Pharmaceutical Analysis 2017年第1期7卷 71-75页

作者： Susithra Selvam Ivy Sarkar Department of Chemistry Vel Tech University Avadi Chennai 600062 Tamilnadu India Department of Chemistry Indian Institute of Technology Madras Chennai 600036 Tamilnadu India

Methylene blue(MB) is a hydrophobic drug molecule, having importance both as a staining reagent and pharmaceutical agent. MB is strongly fluorescent, with an emission peak at 686 nm(λ_(ex)665 nm). In the study,the possibility of MB as an extrinsic fluorophore to study the micellization behavior of bile salts(BSs) was carried out. Since BSs are drug delivery systems, the solubilization of hydrophobic MB drug molecule by BSs was achieved and the nature of association of MB with BS media, namely sodium cholate(Na C) and sodium deoxycholate(Na DC) was evaluated. Change in the photophysical properties of MB is monitored through fluorescence intensity and fluorescence anisotropy at emission peak, 686 nm of MB. Molecular mechanics calculations were carried out to evaluate the MB–BS association. The estimated heat of formation, ΔH_f values are –625.19 kcal/mol for MB–Na C and –757.48 kcal/mol for MB–Na DC. The photophysical study also revealed that MB reports the step-wise aggregation pattern of BSs media, as an extrinsic fluorescence probe.

关键词： Methylene blue Sodium deoxycholate Sodium cholate Absorption Fluorescence spectroscopy Molecular mechanics