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印度Bodal化学收购trion化学的全部股份

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精细石油化工进展 2020年第1期21卷 31-31页

印度Bodal化学公司于2020年2月17日宣布,已收购印度trion化学(TCPL)的全部股份。该交易以5871万印度卢比(819103美元)成交。Bodal化学公司早些时候购买了TCPL 59%的股份,使TCPL成为Bodal的全资子公司。Bodal表示,收购TCPL是为了扩大特... 详细信息

印度Bodal化学公司于2020年2月17日宣布,已收购印度trion化学(TCPL)的全部股份。该交易以5871万印度卢比(819103美元)成交。Bodal化学公司早些时候购买了TCPL 59%的股份,使TCPL成为Bodal的全资子公司。Bodal表示,收购TCPL是为了扩大特种化学品业务。它主要生产染料中间体和染料,用于纺织、造纸、皮革等行业。2019年,TCPL的销售额达到了1.6173亿卢比。

关键词： Bodal trion

Long-lived Single Excitons, trions, and Biexcitons in CdSe/CdTe Type-II Colloidal Quantum Wells

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Chinese Journal of Chemical Physics 2017年第6期30卷 649-656,I0001页

作者：王俊慧梁桂杰吴凯丰中国科学院大连化学物理研究所分子反应动力学国家重点实验室能源材料化学协同创新中心大连116023

Light-harvesters with long-lived excited states are desired for efficient solar energy conversion systems. Many solar-to-fuel conversion reactions, such as H2 evolution and CO2 reduction, require multiple sequential electron transfer processes, which leads to a complicated situation that excited states involves not only excitons （electron-hole pairs） but also multi-excitons and charged excitons. While long-lived excitons can be obtained in various systems （e.g., semiconductor nanocrystals）, multi-excitons and charged excitons are typically shorted-lived due to nonradiative Auger recombination pathways whereby the recombination energy of an exciton is quickly transferred to the third carrier on a few to hundreds of picoseconds timescale. In this work, we report a study of excitons, trions （an exciton plus an additional charge）, and biexcitons in CdSe/CdTe colloidal quantum wells or nanoplatelets. The type- II band alignment effectively separates electrons and holes in space, leading to a single exciton lifetime of 340 ns which is -2 order of magnitudes longer than that in plane CdSe nanoplatelets. More importantly, the electron-hole separation also dramatically slows down Auger decay, giving rise to a trion lifetime of 70 ns and a biexciton lifetime of 11 ns, among the longest values ever reported for colloidal nanocrystals. The long-lived exciton, trion, and biexciton states, combined with the intrinsically strong light-absorption capability of two-dimensional systems, enable the CdSe/CdTe type-II nanoplatelets as promising light harvesters for efficient solar-to-fuel conversion reactions.

关键词： Solar energy Excited state lifetime Exciton trion Biexciton Type-II quan-tum wells Nanoplatelets Auger recombination

Negative trions Trapped by a Spherical Parabolic Quantum Dot

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Communications in Theoretical Physics 2006年第3期45卷 565-567页

作者： XIE Wen-Fang Department of Physics Guangzhou University Guangzhou 510405 China

In this paper, a negatively charged exciton trapped by a spherical parabolic quantum dot has been investigated. The energy spectra of low-lying states are calculated by means of matrix diagonalization. The important feature of the low-lying states of the negatively charged excitons in a spherical quantum dot is obtained via an analysis of the energy spectra.

关键词： trion quantum dot

Local modulation of exc辻ons and trions in monolayer WS2 by carbon nanotubes

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Nano Research 2020年第7期13卷 1982-1987页

作者： Rui Feng Shicheng Xu Weiming Liu Peng Gao Jin Zhang Lianming Tong Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China

Mixed dimensional van der Waals(VdW)heterostructures constructed by one-dimensional(1D)and two-dimensional(2D)materials exhibit extra degree of freedom to modulate the electronic and optical properties due to the combination of difterent *** charge transfer at the intertace between 1D and 2D materials plays a crucial role in the optoelectronic properties and performance of the heterostructure-based ***,we stacked single-walled carbon nanotubes(SWNTs)on monolayer WS2 for a mixed dimensional vdW heterostructure,and investigated the local modulation of excitions and trions in WS2 by *** directions of charge transfer between SWNTs and WSz are evidenced by the photoluminescence(PL)spectra of *** PL intensity can be either enhanced or weakened by individual *** our work,the PL intensity of WS2 is enhanced and the exciton peak position heterostructure is red-shifted about 3 meV due to the charge transfer from WS2 to an individual SWNT(SWNT#1).The change of PL by another SWNT(SWNT#2)can not be well-resolved in far fild,but scanning near field optical microscope(SNOM)measurements show that the PL intensity of WS2 is weakened by the *** peak position of exciton is blue-shifted by^1 meV while that of trion is redshifted by^1 meV due to the charge transfer from the SWNT to WS2,These results give insight into the charge transfer at the interface of SWNTWS2 heterostructure,and can be useful for design of optoelectronic devices based on mixed dimensional vdW heterostructures.

关键词： WS2 single-walled carbon nanotube(SWNT) mixed dimensional heterostructure excitons trion

Giant enhancement of photoluminescence emission in monolayer WS_(2)by femtosecond laser irradiation

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Frontiers of physics 2021年第1期16卷 143-150页

作者： Cheng-Bing Qin Xi-Long Liang Shuang-Ping Han Guo-Feng Zhang Rui-Yun Chen Jian-Yong Hu Lian-Tuan Xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Monolayer transition metal dichalcogenides have emerged as promising mat erials for opt oelectTonic and nanophotonic ***,the low photoluminescence(PL)quantum yield(QY)hinders their various potential *** we engineer and enhance the PL intensity of monolayer WS_(2)by femtosecond laser *** than two orders of magnitude enhancement of PL intensity as compared to the as-prepared sample is ***,the engineering time is shortened by three orders of magnitude as compared to the improvement of PL intensity by continuous-wave laser *** on the evolution of PL spectra,we attribute the giant PL enhancement to the conversion from trion emission to exciton,as well as the improvement of the QY when exciton and trion are localized to the new-formed *** have created microstructures on the monolayer WS_(2)based on the enhancement of PL intensity,where the engineered structures can be stably stored for more than three *** flexible approach with the feature of excellent long-term storage stability is promising for applications in information storage,display technology,and opto electronic devices.

关键词： monolayers WS_(2) giant enhancement photoluminescence femtosecond laser irradiation micropatterning exciton trion quantum yield

Strain-induced direct-indirect bandgap transition and phonon modulation in monolayer WS2

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Nano Research 2015年第8期8卷 2562-2572页

作者： Yanlong Wang Chunxiao Cong Weihuang Yang Jingzhi Shang Namphung Peimyoo Yu Chen Junyong Kang Jianpu Wang Wei Huang Ting Yu Nanyang Technological University-Nanjing Tech Center of Research and Development Nanjing Tech University Nanjing 211816 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Fujian Key Laboratory of Semiconductor Materials and Applications Department of Physics Xiamen University Xiamen 361005 China Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Jiangsu National Synergetic Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) Nanjing 211816 China Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University ot Posts & Telecommunications 9 Wenyuan Road Nanjing 210046 China

In situ strain photoluminescence （PL） and Raman spectroscopy have been employed to exploit the evolutions of the electronic band structure and lattice vibrational responses of chemical vapor deposition （CVD）-grown monolayer tungsten disulphide （WS2） under uniaxial tensile strain. Observable broadening and appearance of an extra small feature at the longer-wavelength side shoulder of the PL peak occur under 2.5% strain, which could indicate the direct-indirect bandgap transition and is further confirmed by our density-functional-theory calculations. As the strain increases further, the spectral weight of the indirect transition gradually increases. Over the entire strain range, with the increase of the strain, the light emissions corresponding to each optical transition, such as the direct bandgap transition （K-K） and indirect bandgap transition （F-K, ≥2.5%）, exhibit a monotonous linear redshift. In addition, the binding energy of the indirect transition is found to be larger than that of the direct transition, and the slight lowering of the trion dissociation energy with increasing strain is observed. The strain was used to modulate not only the electronic band structure but also the lattice vibrations. The softening and splitting of the in-plane E＇ mode is observed under uniaxial tensile strain, and polarization-dependent Raman spectroscopy confirms the observed zigzag-oriented edge of WS2 grown by CVD in previous studies. These findings enrich our understanding of the strained states of monolayer transition-metal dichalcogenide （TMD） materials and lay a foundation for developing applications exploiting their strain-dependent optical properties, including the strain detection and light-emission modulation of such emerging two-dimensional TMDs.

关键词： monolayer WS2 strain light-emission tuning indirect transition trion crystallographic orientation

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聚合物中正负trions的碰撞过程研究

聚合物中正负trions的碰撞过程研究

作者：刘晓琳河北师范大学

学位级别：硕士

有机共轭聚合物是一种具有开发潜力的新型高分子有机材料,它不仅可以导电发光,又具有柔韧性、极易加工、价格低廉等优点,这使得有机材料成为近年来研究的热点。由于共轭聚合物具有准一维结构和强的电-声耦合作用,其载流子不再是电子和空... 详细信息

有机共轭聚合物是一种具有开发潜力的新型高分子有机材料,它不仅可以导电发光,又具有柔韧性、极易加工、价格低廉等优点,这使得有机材料成为近年来研究的热点。由于共轭聚合物具有准一维结构和强的电-声耦合作用,其载流子不再是电子和空穴,而是伴随晶格畸变的具有内部结构的复合粒子,例如极化子、双极化子和trion等。这些准粒子体系具有丰富的物理过程,它们的形成、激发和碰撞等动力学过程在很大程度上决定着聚合物的电致发光性质。一些研究工作表明,极化子、双极化子、激子等元激发通过碰撞、复合,将会生成极化子的激发态trion。trion的发现为提高发光二极管电致发光效率开辟了新的通道,它的存在和碰撞动力学特性也会对有机材料的电输运特性及发光效率产生很大的影响。本课题将采用一维紧束缚近似的Su-Schrieffer-Heeger(SSH)模型,利用非绝热分子动力学,系统地研究有机共轭聚合物中正负trions的碰撞过程。1、聚合物单链上正负trions的碰撞过程电场的作用下,正负trions在聚合物链上发生碰撞,形成激子、双激子和trion的混合态。当电场Etrions碰撞后复合,形成的激子和双激子产率随着电场变化有一定的振荡。随着电场的增加1.5mV/?4.0mV/?作用下,由于碰撞将引起晶格的振动,它们可能不再具有规则的晶格结构,碰撞后电荷变成自由粒子。2、耦合聚合物中正负trions的碰撞过程在电场的作用下,正负trions在链间耦合区域发生碰撞,耦合强度很小时,正负trions碰撞后带着原电荷返回,局域在正负trions中的电荷数量基本上是不变的,符号也没发生变化。随着耦合强度的增加,电子波函数交叠程度增加,局域在正负trions中的电荷逐渐减少,这是双激子、激子和trion的混合态。当耦合强度很大时,碰撞引起很强的晶格振动,trions解体,电荷将不会局域在规则的自陷结构中,而是自由粒子。链间耦合区域也影响激子和双激子的形成,随着链间耦合区域增加,在碰撞过程中正负trions的波函数交叠程度增加,电荷跃迁更容易,因此激子和双激子的产率也会增加。

关键词：共轭聚合物电-声相互作用碰撞与复合 trion (双)激子

Dynamics of Exciton Transport in Two-Dimensional Materials

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中国激光 2023年第1期50卷 126-137页

作者： Xia Yuexing Zhang Shuai Wu Keming Gong Yiyang Yue Shuai Liu Xinfeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academyof Sciences Beijing 100049China

In recent years,two-dimensional(2D)materials have attracted extensive interests due to the large exciton binding energy different from bulk *** peculiar properties have been discovered that have farreaching perspectives in the next generation of optoelectronic *** this review,we introduce the forms of exciton existence in 2D materials and several promising 2D materials with good applications at ***,we summarize relevant contemporary tools for probing exciton dynamics and methods of regulating 2D exciton transport,for instance,electrical regulation,stress/surface wave regulation and moirépotential regulation,***,we conclude the general development of regulation in 2D materials and propose several possible opportunities of application prospect.

关键词： materials exciton diffusion transition metal dichalcogenide van deer Waals heterostructure trion moiréexciton

一种简便快速的制备水稻基因组DNA PCR模板的方法

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生物技术 2010年第4期20卷 30-32页

作者：曹燕王媛齐进焕于力刘秋云中山大学基因工程教育部重点实验室与生物工程研究中心广东广州510275

目的:发展一种简便快速的制备水稻基因组DNA PCR模板的方法。方法:用枪头捣碎水稻叶片代替液氮研磨法提取水稻基因组DNA作PCR模板,在去污剂SDS和表面活性剂trionX-100的存在下在沸水中煮沸10min,然后取上清扩增微管蛋白(TubA1)基因内含... 详细信息

目的:发展一种简便快速的制备水稻基因组DNA PCR模板的方法。方法:用枪头捣碎水稻叶片代替液氮研磨法提取水稻基因组DNA作PCR模板,在去污剂SDS和表面活性剂trionX-100的存在下在沸水中煮沸10min,然后取上清扩增微管蛋白(TubA1)基因内含子。结果:发现在利用煮沸法提取水稻基因组DNA的过程中,用枪头捣碎叶片可代替液氮碾磨,加入0.1%表面活性剂trionX-100煮沸叶片对制备模板有促进效果,得到了预期的PCR片断。结论:该方法快速、简便、经济,具有良好的重复性与特异性,便于自动化。

关键词：煮沸法 PCR模板 trion X-100