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Ultra-Thin Carbon-Doped Bi_(2)WO_(6) Nanosheets for Enhanced Photocatalytic CO_(2) Reduction

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Transactions of Tianjin University 2021年第4期27卷 338-347页

作者： Han Li Junchao Zhang Jiaguo Yu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The photocatalytic reduction of CO_(2) is a promising strategy to generate chemical ***,this reaction usually suf-fers from low photoactivity because of insuffi cient light absorption and rapid charge *** engineering has become an eff ective approach to improve the photocatalytic ***,ultra-thin(~4.1 nm)carbon-doped Bi_(2)WO_(6) nanosheets were prepared via hydrothermal treatment followed by *** ultra-thin nanosheet structure of the cata-lyst not only provides more active sites but also shortens the diff usion distance of charge carriers,thereby suppressing charge ***,carbon doping could successfully extend the light absorption range of the catalyst and remarkably promote charge separation,thus inhibiting *** a result,the as-prepared Bi_(2)WO_(6) photocatalyst with ultra-thin nanosheet structure and carbon doping exhibits enhanced photocatalytic CO_(2) reduction performance,which is twice that of pristine ultra-thin Bi_(2)WO_(6) *** study highlights the importance of defect engineering in photocatalytic energy conversion and provides new insights for fabricating effi cient photocatalysts.

关键词： Defect engineering Bi_(2)WO_(6)nanosheet Charge separation light absorption

A Double Layer Laminated Film of Cellulose Nanocrystals and Dye Displaying Vibrant Circularly Polarized light

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Chemical Research in Chinese Universities 2022年第1期38卷 45-49页

作者： WEI Lihong MA Xiaoting XU Yan State Key Laboratory of Inorganic Synthesis&Preparative Chemistry Jilin UniversityChangchun 130012P.R.China College of Chemistry Jilin UniversityChangchun 130012P.R.China

Circularly polarized(CP)light is a circularly polarized electromagnetic wave and is of significance for applications,such as information storage and encryption,3D display and sensing due to its unique optical properties including optical information storage capacity and chiral *** order to produce circularly polarized light,chirality and light including spontaneous luminescence and incident light are necessary.

关键词： Cellulose nanocrystal Dye Tunable circularly polarized light Selective reflection light absorption

High-Performance Organic Solar Cells with Broadband absorption

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High-Performance Organic Solar Cells with Broadband Absorpti...

Spectrum redshift effect of anatase TiO_2 codoped with nitrogen and first transition elements

2015年（第七届）西部光子学学术会议

作者： Xuanhua Li Wallace.C.H.Choy Bingqing Wei The Nano Energy and Materials Center The School of Materials Science and Engineering the Northwestern Polytechnical University Electrical and Electronic Engineering The University of Hong Kong

Broadband absorption enhancement in metal nanomaterials for high-performance organic solar cells（OSCs） is highly desirable in the plasmonic-enhanced OSCs. Here, a new dual plasmonic device is proposed by strategically designing device structures and managing two types of plasmonic structures（e.g., metal grating and metal nanoparticles（NPs）） in one device to achieve the broadband enhancement around the wavelength of 350–800 nm due to multiple plasmonic effects. As a result, the maximum power conversion efficiency（PCE） of 9.62% has been achieved from the device, which is one of the highest efficiencies in plasmonic OSCs reported for a single junction OSC. This work demonstrates the significance of rational design of the device structure and plasmonic nanostructures in achieving high-performance plasmonic OSCs with broadband plasmonic absorption enhancement.

关键词： Organic solar cells Plasmonic Broadband light absorption

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Chinese Optics Letters 2014年第9期12卷 59-65页

作者：辜永红蔡从中冯庆李艳华 Department of Applied Physics Chongqing University Chongqing Key Laboratory on Optoelectronic Functional Materials Chongqing Normal University

The electronic and optical properties, including band structure, density of states （DOS）, absorption rate, refractive index, and dielectric function, of anatase TiO2 codoped with N and first transition elements are investigated using the plane wave pseudopotential method based on the density functional theory. The calculation results show that TiO2 codoping with N and first transition elements （Sc, V, Cr, Mn, and Fe） lead to significant reduction of conduction band relative to the Fermi level, reduction of band gap width, formation of new donor, and acceptor impurity levels below the conduction band and above the valence band, and cause some redshifts of optical absorption band edge with the amount of redshift decrease in the following order： N-Fe 〉 N-Cr 〉 N-Mn. Further, the synergistic effect of shallow donor and acceptor levels enhances light excitation for effective separation of electron-hole pairs and enhancement of light absorption ability, thereby increasing the TiO~ photocatalytic properties. This study reveals that the visible-light absorption ability of the codoped anatase TiO2 decreases in the order of N Fe 〉 N Cr 〉 N-Mn 〉 N-Sc 〉 N-V 〉 N, and does not monotonically follow the dopant atomic number. Especially, in N-Cr codoped TiO2, the 4s atomic orbit of Cr is not completely filled, which hybridized with the p electronic orbit most probably acts as photo-generated electron trap centers resulting in higher photocatalytie activity than that of N-Mn codoped TiO2.

关键词： Atoms Chromium Conduction bands Density functional theory Doping (additives) Energy gap light light absorption Manganese Photocatalysis Refractive index Scandium Transition metals

Growth and optical properties of Cr^(3+)-doped CdWO_4 single crystals

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Chinese Optics Letters 2012年第4期10卷 51-54页

作者：万云涛胡皓阳夏海平张约品江浩川陈红兵 Key laboratory of Photo-Electronic Materials Ningbo University Faculty of Material Science and Chemical Engineering Ningbo University

A high-quality Cr 3＋：CdWO4 single crystal at a size of approximatelyΦ25×80 mm is grown using the Bridgman method with CdO,WO3,and Cr2O3 as raw materials and their molar ratio of 100：100：*** temperature gradient of solid-liquid interface at growth is approximately 50？C/cm and the growth rate is 0.05 mm/*** X-ray diffraction（XRD）,absorption,excitation,and emission spectra of different parts of the as-grown and O2-annealed crystals are *** strong broad optical absorption bands of about 472 and 708 nm are observed,and they are associated with the transitions 4 A2→ 4 T1 and 4 A2→ 4 *** weak 4 T2→ 2 E transition（the R-line）at 632 nm is also *** crystal-field parameter Dq and the Racah parameters B and C are estimated to be 1 412.4,776.8,and 3 427.6 cm？ 1,respectively,according to the absorption spectra and crystal-splitting theory.A broadband fluorescence at about 1 000 nm due to 4 T2→ 4 A2 transition is produced by exciting the samples at 675 *** being annealed in an O2 atmosphere,the crystals become more transparent,while the effective light absorption of Cr 3＋ ions is evidently enhanced and the emission intensity is also strengthened due to the reduction of oxygen vacancies in the CdWO4 crystal after annealing.

关键词： Annealing Cadmium compounds Emission spectroscopy light absorption Optical properties Single crystals X ray diffraction

Investigation of transient two-photon excited fluorescence in biological tissue

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Chinese Optics Letters 2012年第5期10卷 44-46页

作者：邱怡申陈恩果李高明李晖 Key Laboratory of OptoElectronic Science and Technology for Medicine Ministry of Education Fujian Provincial Key Laboratory for Photonics TechnologyFujian Normal University Department of Optical Engineering Zhejiang University

The fluorescence power from biological tissue excited by a femtosecond laser pulse compared with excitation power does not appear to obey a simple quadratic relationship given by the steady non-linear theory. A more reliable analysis is developed based on transient two-photon absorption because the response time of two-photon absorption is longer than the width of a femtosecond pulse. Good agreement is obtained between the theoretical analysis and the experimental results of fluorescence power versus excitation power. This letter offers potential value to non-linear optics in biological tissues.

关键词： Electromagnetic pulse Fluorescence light absorption Luminescence of organic solids Two photon processes Ultrafast lasers Ultrashort pulses

One-step formation of multifunctional nano- and microscale structures on metal surface by femtosecond laser

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Chinese Optics Letters 2015年第6期13卷 48-51页

作者：陶海岩宋晓伟郝作强林景全 School of Science Changchun University of Science and Technology

Metals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster *** of a focused femtosecond laser pulse without any further treatment, structured aluminum and nickel surfaces exhibit combined features of superhydrophobicity with a contact angle of 155.5°, and a high optical absorption with a rcflectivity of several percent over a broad spectral range （0.2-2.5μm）. Thus, a multifunctional structured metal surface that integrates superhydrophobicity and a high broadband absorptivity has been easily realized by one-step femtosecond laser processing.

关键词： Electromagnetic wave absorption Hydrophobicity Laser pulses light absorption Reflection Ultrafast lasers

Facilitating electron extraction of inverted polymer solar cells by using organic/inorganic/organic composite buffer layer

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Facilitating electron extraction of inverted polymer solar c...

Optical properties of Rural Brown Carbon in Northwestern China

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Jiaxin Guo Wenbin Guo State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University

In this work, the performance of inverted polymer solar cells(PSCs) was enhanced by introducing an organic-inorganic-organic(OIO) composite electron transporting layer(ETL) with structure of PEI/SnO/PFN. The work function measurement and surface morphology indicated that OIO ETL matched the energy level between active layer and cathode, and reduced the interfacial defects owing to the poor contact between organic material and inorganic substance. Also, the OIO ETL could enhance the light absorption of active layer. Therefore, both a high short current density(J) and fill factor(FF) was obtained in devices with an OIO ETL, leading to a dramatic enhancement of device efficiency from 5.51% to 7.18%, accounting for a 30.30% increase. This novel concept of OIO ETL paves a new path for the future in applications of PSCs.

关键词： PC71BM induce phase separation electron transport light absorption

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Optical properties of Rural Brown Carbon in Northwestern Chi...