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Dual-functional additive of cesium ion for achieving ultrahigh efficiency of persistent phosphorescence in existing polymer-based materials

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Science China Chemistry 2025年第2期68卷 754-762页

作者： Yao Liu Jinzheng Chen Yiling Miao Kaimin Zhang Faxu Lin Huahua Huang Lina Zhang Zhan Yang Yi Zhang Zhenguo Chi Zhiyong Yang Key Laboratory for Polymeric Composite&Functional Materials of Ministry of Education Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional FilmsGuangdong Basic Research Center of Excellence(GBRCE)for Functional Molecular EngineeringSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China College of Materials Science and Engineering Hebei University of EngineeringHandan 056038China School of Environmental and Chemical Engineering Wuyi UniversityJiangmen 529020China

Despite great achievements obtained for polymer-based room-temperature phosphorescence(RTP)materials,the limited efficiencies of persistent RTP still hinder their ***,a simple and universal strategy of using the dual-functional additive of Cs+was presented,which could simultaneously enhance the efficiency(Φp)and maintain the long lifetime(τp)of RTP in existing polymer-based systems with various phosphors and *** them,the commercial emitter(TpB)-doped polyvinyl alcohol(PVA)/Cs_(2)CO_(3) system possessed an extremely high Φp up to 75.5% and still maintained a longτp of 2.13 s,by introducing the heavy-atom effect and an extra network of ionic bonding through the Cs+***,the temperature resistance of RTP in TpB@PVA/Cs+film could also be improved to 85℃.More satisfactorily,the efficiency of Förster resonance energy transfer(FRET)from RTP to near-infrared(NIR)was also remarkably enhanced in the multi-component *** work provides a simple and universal strategy for developing polymer systems with high RTP performance.

关键词： persistent phosphorescence cesium carbonate efficiency heavy-atom effect ionic interaction

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Significantly enhanced of tungsten diselenide functionalization optoelectronic performance phototransistor via surface

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Nano Research 2017年第4期10卷 1282-1291页

作者： Bo Lei Department of Physics National University of Singapore Singapore 117542 Singapore 2 Centre forAdvanced D Materials and Graphene Research Centre National University of Singapore Singapore 117546 Singapore Department of Chemistry National University of Singapore Singapore 117543 Singapore SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen University Shenzhen 518060 China National University of Singapore (Suzhou) Research Institute 377 Lin Quan Street Suzhou Industrial Park Suzhou 215123 China

Two-dimensional （2D） layered transition metal dichalcogenides （TMDs） have attracted enormous research interests and efforts towards the development of versatile electronic and optical devices, owing to their extraordinary and unique fundamental properties and remarkable prospects in nanoelectronic applications. Among the TMDs, tungsten diselenide （WSe2） exhibits tunable ambipolar transport characteristics and superior optical properties such as high quantum efficiency. Herein, we demonstrate significant enhancement in the device performance of WSe2 phototransistor by in situ surface functionalization with cesium carbonate （Cs2CO3）. WSe2 was found to be strongly doped with electrons after Cs2CO3 modification. The electron mobility of WSe2 increased by almost one order of magnitude after surface functionalization with 1.6-nm-thick Cs2CO3 decoration. Furthermore, the photocurrent of the WSe2-based phototransistor increased by nearly three orders of magnitude with the deposition of 1.6-nm-thick Cs2CO3. Characterizations by in situ photoelectron spectroscopy techniques confirmed the significant surface charge transfer occurring at the Cs2COB/WSe2 interface. Our findings coupled with the tunable nature of the surface transfer doping method establish WSe2 as a promising candidate for future 2D materials- based optoelectronic devices.

关键词： WSe2 in situ surface transfer doping performance enhancement phototransistor cesium carbonate

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Significant Heterogeneous carbonate Salt Catalyzed Acetylation of Alcohols via a Transesterification Process with carbonate Salt-activated Alcohol 1H NMR Evidence

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Chinese Journal of Chemistry 2011年第6期29卷 1143-1148页

作者： Xiong, Yan Zhang, Xueqiang College of Chemistry and Chemical Engineering Chongqing University Chongqing 400030 China

Heterogeneous carbonate salt catalyzed acetylation of alcohols via a transesterification process has been devel- oped. Various esters are furnished up to 97% yield. Established procedure is simple and air-tolerant with readily available reagents. Ethyl acetate and isobutyl acetate are used as not only acetylating agents, but also reaction sol- vents in transesterification. Aliphatic linear alcohols, allylic alcohols and benzyl alcohols show high reactivities in the presence of 1 or 5 mol% Cs2CO3 at 125 ℃. cesium carbonate can be recycled by pumping liquid phase out of reactor after reaction. During four cycle runs for reaction of 2-phenylethanol and ethyl acetate, high yields of phenethyl acetate are provided （〉60% yield）. Based on experiments and 1H NMR investigation, bifunctional catalysis is proposed, alcohol activated by carbonate ion is confirmed, and higher activity of catalytic amount than stoichiometric cesium carbonate is interpreted.

关键词： acetylation alcohols cesium carbonate ester NMR analysis transesterification

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