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1Towards 6G wireless communication networks:vision,enabling technologies,and new paradigm shifts显示文摘The fifth generation(5G)wireless communication networks are being deployed worldwide from 2020 and more capabilities are in the process of being standardized,such as mass connectivity,ultra-reliability,and guaranteed low latency.However,5G will not meet all requirements of the future in 2030 and beyond,and sixth generation(6G)wireless communication networks are expected to provide global coverage,enhanced spectral/energy/cost efficiency,better intelligence level and security,etc.To meet these requirements,6G networks will rely on new enabling technologies,i.e.,air interface and transmission technologies and novel network architecture,such as waveform design,multiple access,channel coding schemes,multi-antenna technologies,network slicing,cell-free architecture,and cloud/fog/edge computing.Our vision on 6G is that it will have four new paradigm shifts.First,to satisfy the requirement of global coverage,6G will not be limited to terrestrial communication networks,which will need to be complemented with non-terrestrial networks such as satellite and unmanned aerial vehicle(UAV)communication networks,thus achieving a space-airground-sea integrated communication network.Second,all spectra will be fully explored to further increase data rates and connection density,including the sub-6GHz,millimeter wave(mmWave),terahertz(THz),and optical frequency bands.Third,facing the big datasets generated by the use of extremely heterogeneous networks,diverse communication scenarios,large numbers of antennas,wide bandwidths,and new service requirements,6G networks will enable a new range of smart applications with the aid of artificial intelligence(AI)and big data technologies.Fourth,network security will have to be strengthened when developing 6G networks.This article provides a comprehensive survey of recent advances and future trends in these four aspects.Clearly,6G with additional technical requirements beyond those of 5G will enable faster and further communications to the extent that the boundary between physical and cyber worlds disappears.Xiaohu YOU Cheng-Xiang WANG Jie HUANG Xiqi GAO Zaichen ZHANG Mao WANG Yongming HUANG Chuan ZHANG Yanxiang JIANG Jiaheng WANG Min ZHU Bin SHENG Dongming WANG Zhiwen PAN Pengcheng ZHU Yang YANG Zening LIU Ping ZHANG Xiaofeng TAO Shaoqian LI Zhi CHEN Xinying MA Chih-Lin I Shuangfeng HAN Ke LI Chengkang PAN Zhimin ZHENG Lajos HANZO Xuemin(Sherman)SHEN Yingjie Jay GUO Zhiguo DING Harald HAAS Wen TONG Peiying ZHU Ganghua YANG Jun WANG Erik GLARSSON Hien Quoc NGO Wei HONG Haiming WANG Debin HOU Jixin CHEN Zhe CHEN Zhangcheng HAO Geoffrey Ye LI Rahim TAFAZOLLI Yue GAO HVincent POOR Gerhard P.FETTWEIS Ying-Chang LIANG 2021Science China(Information Sciences)2021,64,1:122
2Anti-SARS-CoV-2 activities in vitro of Shuanghuanglian preparations and bioactive ingredients显示文摘Human infection with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)causes coronavirus disease 2019(COVID-19)and there is no cure currently.The 3CL protease(3CLpro)is a highly conserved protease which is indispensable for CoVs replication,and is a promising target for development of broad-spectrum antiviral drugs.In this study we investigated the anti-SARS-CoV-2 potential of Shuanghuanglian preparation,a Chinese traditional patent medicine with a long history for treating respiratory tract infection in China.We showed that either the oral liquid of Shuanghuanglian,the lyophilized powder of Shuanghuanglian for injection or their bioactive components dose-dependently inhibited SARS-CoV-23CLpro as well as the replication of SARS-CoV-2 in Vero E6 cells.Baicalin and baicalein,two ingredients of Shuanghuanglian,were characterized as the first noncovalent,nonpeptidomimetic inhibitors of SARS-CoV-23CLpro and exhibited potent antiviral activities in a cell-based system.Remarkably,the binding mode of baicalein with SARS-CoV-23CLpro determined by X-ray protein crystallography was distinctly different from those of known 3CLpro inhibitors.Baicalein was productively ensconced in the core of the substrate-binding pocket by interacting with two catalytic residues,the crucial S1/S2 subsites and the oxyanion loop,acting as a“shield”in front of the catalytic dyad to effectively prevent substrate access to the catalytic dyad within the active site.Overall,this study provides an example for exploring the in vitro potency of Chinese traditional patent medicines and effectively identifying bioactive ingredients toward a specific target,and gains evidence supporting the in vivo studies of Shuanghuanglian oral liquid as well as two natural products for COVID-19 treatment.Hai-xia Su Sheng Yao Wen-feng Zhao Min-jun Li Jia Liu Wei-juan Shang Hang Xie Chang-qiang Ke Hang-chen Hu Mei-na Gao Kun-qian Yu Hong Liu Jing-shan Shen Wei Tang Lei-ke Zhang Geng-fu Xiao Li Ni Dao-wen Wang Jian-ping Zuo Hua-liang Jiang Fang Bai Yan Wu Yang Ye Ye-chun Xu 2020Acta Pharmacologica Sinica2020,41,9:32
3Genetic correction of p-thalassemia patient-specific iPS cells and its use in improving hemoglobin production in irradiated SCID mice显示文摘Yixuan Wang Chen-Guang Zheng Yonghua Jiang Jiqin Zhang Jiayu Chen Chao Yao Qingguo Zhao Sheng Liu Ke Chen Juan Du Ze Yang Shaorong Gao 2012Cell Research2012,22,4:27
4Exogenous NADPH ameliorates myocardial ischemia–reperfusion injury in rats through activating AMPK/mTOR pathway显示文摘Our previous study shows that nicotinamide adenine dinucleotide phosphate(NADPH)plays an important role in protecting against cerebral ischemia injury.In this study we investigated whether NADPH exerted cardioprotection against myocardial ischemia/reperfusion(I/R)injury.To induce myocardial I/R injury,rats were subjected to ligation of the left anterior descending branch of coronary artery for 30 min followed by reperfusion for 2 h.At the onset of reperfusion,NADPH(4,8,16 mg·kg?1·d?1,iv)was administered to the rats.We found that NADPH concentrations in plasma and heart were signi?cantly increased at 4 h after intravenous administration.Exogenous NADPH(8?16 mg/kg)signi?cantly decreased myocardial infarct size and reduced serum levels of lactate dehydrogenase(LDH)and cardiac troponin I(cTn-I).Exogenous NADPH signi?cantly decreased the apoptotic rate of cardiomyocytes,and reduced the cleavage of PARP and caspase-3.In addition,exogenous NADPH reduced mitochondrial vacuolation and increased mitochondrial membrane protein COXIV and TOM20,decreased BNIP3L and increased Bcl-2 to protect mitochondrial function.We conducted in vitro experiments in neonatal rat cardiomyocytes(NRCM)subjected to oxygen–glucose deprivation/restoration(OGD/R).Pretreatment with NADPH(60,500 nM)signi?cantly rescued the cell viability and inhibited OGD/R-induced apoptosis.Pretreatment with NADPH signi?cantly increased the phosphorylation of AMPK and downregulated the phosphorylation of mTOR in OGD/R-treated NRCM.Compound C,an AMPK inhibitor,abolished NADPH-induced AMPK phosphorylation and cardioprotection in OGD/R-treated NRCM.In conclusion,exogenous NADPH exerts cardioprotection against myocardial I/R injury through the activation of AMPK/mTOR pathway and inhibiting mitochondrial damage and cardiomyocyte apoptosis.NADPH may be a potential candidate for the prevention and treatment of myocardial ischemic diseases.Jiang Zhu Yi-fei Wang Xiao-ming Chai Ke Qian Ling-wei Zhang Peng Peng Pei-min Chen Jian-fang Cao Zheng-hong Qin Rui Sheng Hong Xie 2020Acta Pharmacologica Sinica2020,41,4:19
5A new dihydrobenzofuran lignanoside from Selaginella moellendorffii Hieron显示文摘新 lignanoside,(7R,8S )-7,8-dihydro-7-(4-hydroxy-3,5-dimethoxyphenyl)-1 ′ -formyl-3 ′ -methoxyl-8-hydroxymethylbenzofuran-4-O- β -d-glucopyranoside (moellenoside A ) ,从 Selaginella moellendorffii 神庙被孤立。它的结构被分光镜的证据决定。Xiao Ke Zheng Ke Ke Li Yan Zhi Wang Wei Sheng Feng 2008Chinese Chemical Letters2008,19,1:16
6A new sesquilignan from Selaginella sinensis (Desv.) Spring显示文摘新 sesquilignan,也就是 sinensiol A,从 Selaginella sinensis (Desv ) 的植物被孤立春天。它的结构根据各种各样的分光镜的数据分析被识别。Yan Zhi Wang Hui Chen Xiao Ke Zheng Wei Sheng Feng 2007Chinese Chemical Letters2007,18,10:15
7Tungsten Inert Gas Welding–Brazing of AZ31B Magnesium Alloy to TC4 Titanium Alloy显示文摘Tungsten inert gas(TIG) welding-brazing technology using Mg-based filler was developed to join AZ31 B Mg alloy to TC4 Ti alloy in a lap configuration.The results indicate that robust joints can be obtained with welding current in the range of 60-70 A.The joint interface was found to be likely composed of Mg-Ti diffusion reaction layer accompanied with Mg_(17)Al_(12) precipitate phase,indicating that metallurgical joining was achieved.The optimized joint with average tensile-shear strength of 190 N/mm^2 was obtained and fracture occurred at the Ti/fusion zone interfacial layer during tensile test.Moreover,the fracture surface was characterized by equiaxed dimple patterns accompanied with a few lamellar tearing.Finally,finite element modeling(FEM) numerical simulation was developed to analyze the distribution characteristics of the temperature field of joints.Chuan Xu Guangmin Sheng Hui Wang Ke Feng Xinjian Yuan 2016Journal of Materials Science & Technology2016,32,2:11
8Clinicopathologic features of pleomorphic hyalinizing angiectatic tumor of soft parts显示文摘软部分的背景 Pleomorphic hyalinizing angiectatic 肿瘤(PHAT ) 是一个稀罕软织物肿瘤,它是通常考虑的低档。把肿瘤与另外的软织物损害区分开来,我们在 9 个 cases.Methods PHAT 标本分析了 clinicopathologic 和 ultrastructural 特征, immunophenotypes,和 PHAT 的流动 cytometric DNA ploidy 从 1990 ~ 2004 与 PHAT 从 9 个病人被收集。每个标本被切成片并且与 hematoxylin 曙红, phosphotungstic acid-hematoxylin,普鲁士的蓝色,和马森染色了三色分别地。为 vimentin 的 Immunohistochemical 污点, S-100 蛋白质, CD34, CD31, CD99, VEGF, desmin, CD117, -SMA,and MIB-1 与 Envision 系统被执行。流动 cytometry 在四个标本,其二个被电子 microscopy.Results 在 9 个盒子中观察,被使用 PHAT 在 2 个病人,发生在更低的极限在 2 腹股沟,在 1 的腰,在 1 的前臂,在 1 的屁股,在 1 的脚,并且在 1 的胸墙。在表面的下的纸巾介绍的所有损害。后续数据在 7 个病人,(28.6%) 2 在主要治疗以后在之中有复发是可得到的。用显微镜,典型 PHAT 被锭子或 pleomorphic 房间和薄墙的 hyalinized cstatic 容器的簇的像表的增长描绘。在肿瘤, hemosiderin 沉重的锭子房间,众多的小单个容器,和 myxoid 的一些区域,细胞外的矩阵能被识别,显示“不正常的 PHAT ”。有丝分裂的数字在所有 cases.In 是稀罕的 9 个病人(55.6%) 中的 5 个,肿瘤是典型 PHAT;并且在其它 4 (44.4%) ,典型、不正常的 PHAT 共存了。Immunohistochemically,肿瘤的房间为 vimentin, CD34, CD99,和 VEGF 是积极的,但是为 S-100 蛋白质, desmin, SMA,和 CD31 否定。在所有盒子中,肿瘤的房间的 MIB-1 proliferative 活动比 2% 低。Ultrastructural 分析没揭示特定的区别的任何证据。Aneuploidy 没被流动 cytometry.Conclusions 组织学地检测,典型 PHAT 被与 angiectatic vasculature 联系的锭子和 pleomorphic 房间描绘。肿瘤的房间经常表示 vimentin 和 CD34,并且可能为 CD99 积极并且 VEGF.Ultrastructurally,肿瘤通常没有特定的区别。低 MIB-1 索引和在 PHAT 的 aneuploidy 的缺席显示非恶意。然而,因为它的好攻击的行为,我们把肿瘤看作一个边线瘤,并且为疾病的治疗与没有肿瘤的边缘建议宽本地切除术。KE Qi Erbolat ZHANG Hong-ying BU Hong LI Sheng SHI Dan-ni YANG Guang-hua CHEN Hui-jiao WEI Bing 2007Chinese Medical Journal2007,,10:9
9Blood Pressure Associated with Arsenic Methylation and Arsenic Metabolism Caused by Chronic Exposure to Arsenic in Tube Well Water显示文摘Objective The effects of arsenic exposure from drinking water, arsenic metabolism, and arsenic methylation on blood pressure(BP) were observed in this study. Methods The BP and arsenic species of 560 participants were determined. Logistic regression analysis was applied to estimate the odds ratios of BP associated with arsenic metabolites and arsenic methylation capability. Results BP was positively associated with cumulative arsenic exposure(CAE). Subjects with abnormal diastolic blood pressure(DBP), systolic blood pressure(SBP), and pulse pressure(PP) usually had higher urinary i As(inorganic arsenic), MMA(monomethylated arsenic), DMA(dimethylated arsenic), and TAs(total arsenic) than subjects with normal DBP, SBP, and PP. The i As%, MMA%, and DMA% differed slightly between subjects with abnormal BP and those with normal BP. The PMI and SMI were slightly higher in subjects with abnormal PP than in those with normal PP. Conclusion Our findings suggest that higher CAE may elevate BP. Males may have a higher risk of abnormal DBP, whereas females have a higher risk of abnormal SBP and PP. Higher urinary i As may increase the risk of abnormal BP. Lower PMI may elevate the BP. However, higher SMI may increase the DBP and SBP, and lower SMI may elevate the PP.WEI Bing Gan YE Bi Xiong YU Jiang Ping YANG Lin Sheng LI Hai Rong XIA Ya Juan WU Ke Gong 2017Biomedical and Environmental Sciences2017,30,5:9
10BubR1 phosphorylates CENP-E as a switch enabling the transition from lateral association to end-on capture of spindle microtubules显示文摘Error-free mitosis depends on accurate chromosome attachment to spindle microtubules, powered congression of those chromosomes, their segregation in anaphase, and assembly of a spindle midzone at mitotic exit. The centromere-associated kinesin motor CENP-E, whose binding partner is BubR1, has been implicated in congression of misaligned chromosomes and the transition from lateral kinetochore-microtubule association to end-on capture. Although previously proposed to be a pseudokinase, here we report the structure of the kinase domain of Drosophila melanogaster BubR1, revealing its folding into a conformation predicted to be catalytically active. BubR1 is shown to be a bona fide kinase whose phosphorylation of CENP-E switches it from a laterally attached microtubule motor to a plus-end microtubule tip tracker. Computational modeling is used to identify bubristatin as a selective BubR1 kinase antagonist that targets the αN1 helix of N-terminal extension and αC helix of the BubR1 kinase domain. Inhibition of CENP-E phosphorylation is shown to prevent proper microtubule capture at kinetochores and, surprisingly, proper assembly of the central spindle at mitotic exit. Thus, BubR1-mediated CENP-E phosphorylation produces a temporal switch that enables transition from lateral to end-on microtubule capture and organization of microtubules into stable midzone arrays.Yuejia Huang Lin Lin Xing Liu Sheng Ye Phil Y. Yao Wenwen Wang Fengrui Yang Xinjiao Gao Junying Li Yin Zhang Jiancun Zhang Zhihong Yang Xu Liu Zhenye Yang Jianye Zang Maikun Teng Zhiyong Wang Ke Ruan Xia Ding Lin Li Don W. Cleveland Rongguang Zhang Xuebiao Yao 2019Cell Research2019,29,7:8
11Modeling assessment for ammonium nitrogen recovery from wastewater by chemical precipitation显示文摘Chemical precipitation to form magnesium ammonium phosphate(MAP) is an effective technology for recovering ammonium nitrogen(NH4+-N).In the present research,we investigated the thermodynamic modeling of the PHREEQC program for NH4+-N recovery to evaluate the effect of reaction factors on MAP precipitation.The case study of NH4+-N recovery from coking wastewater was conducted to provide a comparison.Response surface methodology(RSM) was applied to assist in understanding the relative significance of reaction factors and the interactive effects of solution conditions.Thermodynamic modeling indicated that the saturation index(SI) of MAP followed a polynomial function of pH.The SI of MAP increased logarithmically with the Mg2+/NH4+ molar ratio(Mg/N) and the initial NH4+-N concentration(CN),respectively,while it decreased with an increase in Ca2+/NH4+ and CO32?/NH4+ molar ratios(Ca/N and CO32?/N),respectively.The trends for NH4+-N removal at different pH and Mg/N levels were similar to the thermodynamic modeling predictions.The RSM analysis indicated that the factors including pH,Mg/N,CN,Ca/N,(Mg/N)×(CO32?/N),(pH)2,(Mg/N)2,and(CN)2 were significant.Response surface plots were useful for understanding the interaction effects on NH4+-N recovery.Tao Zhang Qiucheng Li Lili Ding Hongqiang Ren Ke Xu Yonggang Wu Dong Sheng 2011Journal of Environmental Sciences2011,23,6:8
12Two new megastigmane O-glucopyranosides from the leaves of Broussonetia papyrifera显示文摘二新 megastigmane O-glucopyranosides,说出(2R,3R,5R,6S,9R )-3-hydroxy-5,6-epoxy- β -ionol-2-O- β -d-glucopyranoside (1 ) 并且(2R,3R,5R,6S,9R ) 和六已知的 megastigmanes 的 -3-hydroxyl-5,6-epoxy-acety- β -ionol-2-O- β -d-glucopyranoside (2 ) ,从 Broussonetia papyrifera (悬崖) 的叶子被孤立发泄。他们的结构被化学方法和分光镜的技术包括 2D NMR 建立。Wei Sheng Feng Hong Wei Li Xiao Ke Zheng Sui Qing Chen 2007Chinese Chemical Letters2007,18,12:7
13A new forsythenside from Forsythia suspensa显示文摘新 forsythenside, 4-hydroxy-4-[8-[[1-[(4-hydroxyphenyl ) 乙酰]- 尾 -d-glucopyranosyl-6-]oxy]ethyl]-2,5-cyclohexadien-1-one, 把 forsythenside 称为 F,是从连翘属植物 suspensa (Thunb ) 的植物的 isolasted Vahl。新混合物的结构根据各种各样的分光镜的分析被建立,包括 1H NMR, 13C NMR, 2D NMR 技术(HMBC 和 HSQC ) ,和 HR-ESI-MS。Yan Zhi Wang Qin Ge Ma Xiao Ke Zheng Wei Sheng Feng 2008Chinese Chemical Letters2008,19,10:6
14Three new dimeric diterpenes from Rhododendron molle显示文摘Birhodomolleins A-C(1-3),three novel diterpenoids dimerized from two grayanane diterpenes through an oxygen bridge,were isolated from the flowers of Rhododendron molle.Their structures were elucidated by interpretation of their 1D and 2D NMR and other spectroscopic data.Birhodomollein A(1) contains a rare chloro-substitution on one of the grayanane moieties.These are the first examples of dimeric diterpenes from the Ericaceae family.Shuai-Zhen Zhou Chun-Ping Tang Chang-Qiang Ke Sheng Yao Ge Lin Yang Ye 2017Chinese Chemical Letters2017,28,6:6
15Inhibitory effects of EGFR antisense oligodeoxynucleotide in human colorectal cancer cell line显示文摘INTRODUCTIONEpidermal-growth-factor receptor(EGFR) is apolypeptide with 1186 amino acids,which binds toEGF family growth factors.Two major naturalligands in the family interact with EGFR:one isEGF,the other is transforming growth factor-α(TGF-α).When EGF or TGF-α,binds to EGFR,tyrosine kinase activity is induced which in turntriggers a series of events regulating the cellgrowth.The importance of EGFR in growthregulating pathways was confirmed by the factYong He Jun Zhou Jin Sheng Wu Ke Feng Dou 2000World Journal of Gastroenterology2000,6,5:5
16Promoting effect and mechanism of neodymium on low-temperature selective catalytic reduction with NH3 over Mn/TiO2 catalysts显示文摘Series of Mn/TiO2 catalysts modified with various contents of Nd for low-temperature SCR were synthesized.It can be found that the appropriate amount of Nd can markedly reduce the take-off temperature of Mn/TiO2 catalyst to 80℃and NOx conversion is stabilized over 90%in the wide temperature range of 100-2600 C.0.1 Nd-Mn/Ti shows higher N2 selectivity and better SO2 resistance than Mn/Ti catalyst.The results reveal that Nd-doped Mn/TiO2 catalyst exhibits larger BET surface area and better dispersion of active component Mn2O3.XPS results indicate that the optimal 0.1 Nd-Mn/Ti sample possesses higher concentration of Mn4+and larger amount of adsorbed oxygen at the surface compared with the unmodified counterpart.In situ DRIFTS show that the surface acidity is evidently increased after adding Nd,especially,the Lewis acid sites,and the intermediate(-NH2)is more stable.The reaction mechanism over Mn/Ti and 0.1 Nd-Mn/Ti catalysts obey the Eley-Rideal(E-R)mechanisms under low temperature reaction conditions.H2-TPR results show that Nd-Mn/TiO2 catalyst exhibits better lowtemperature redox properties.Peng Wu Yaping Zhang Ke Zhuang Kai Shen Sheng Wang Tianjiao Huang 2020Journal of Rare Earths2020,38,11:5
17Relationship of the preoperative NRS 2002 score,PG-SGA score,and serum indices with postoperative complications in patients with gastric cancer显示文摘Objective To examine the utility of the Nutrition Risk Screening 2002(NRS 2002),Patient-Generated Subjective Global Assessment(PG-SGA)and serum factors for the preoperative evaluation of gastric cancer patients.Methods We examined 181 gastric cancer patients treated at the First Affiliated Hospital of Guangxi Medical University from January 2015 to January 2018.Nutritional assessments were administered within 48 h of admission.The body mass index(BMI)and serum factors were measured,and information on preoperative nutritional support and postoperative complications was recorded.Results Both the NRS 2002 and PG-SGA had positive correlations with age(P<0.05),and negative correlations with albumin,prealbumin,transferrin,hemoglobin,BMI,and bodyweight(P<0.05).The NRS 2002 and PG-SGA scores were positively correlated with each other(r=0.683,P<0.01),but had poor consistency(κ=0.357,P<0.01).During the preoperative period,33.2%of patients received nutritional support,mainly enteral nutrition.The nutritional risk group(NRS 2002≥3)received more support than the group without nutritional risk(NRS 2002<3;P<0.05).Patients with nutritional risk or malnutrition who received preoperative nutritional support had fewer postoperative complications than unsupported patients.The overall rate of complications was 12.2%,and the rate of severe complications(gradeⅢor above)was 5.5%.The malnutrition and nutritional risk groups had higher rates of severe complications.Conclusions The combined application of the NRS 2002,PG-SGA,BMI,and serum nutritional indices was useful for the nutritional screening and assessment of preoperative gastric cancer patients.The NRS 2002 and PG-SGA provided guidance on the need for nutritional support during the preoperative period.Dao Lai Huang Xiang Hua Wu Chang Li Wang Jun Qiang Chen Kui Jia Jing Zhou Li Sheng Lu Yong Sheng Zhang Jing Jin Ke Ke Huang 2021Journal of Nutritional Oncology2021,6,2:5
18A new phenylethanoid glycoside from Rabdosia lophanthoides(Buch.-Ham.ex D.Don) Hara.显示文摘新 phenylethanoid glycoside, 3-hydroxy-4-methoxy-β -phenylethoxy-O-α-l-rhamnopyranosyl-(1 →3 )-2-O-acetyl-O-β-d-glucopyranoside, 把 lophanthoside 称为 A,从 Rabdosia lophanthoides (Buch.-Ham.ex D.Don ) 被孤立 Hara。它的结构被分光镜的证据决定。Wei Sheng Feng Xin Yu Zang Xiao Ke Zheng Yan Zhi Wang 2009Chinese Chemical Letters2009,20,4:4
19A new aryl glycoside from Euphorbia helioscopia L.显示文摘新芳基 glycoside, 3 ″ -O-galloyl-benzyl-O-α-l-rhamnopyranosyl-(1 →6 )-β-d-glucopyranoside, 从大戟属植物 helioscopia L. 被孤立,并且它的结构根据各种各样的分光镜的数据分析被阐明。Wei Sheng Feng Li Gao Xiao Ke Zheng Yan Zhi Wang 2009Chinese Chemical Letters2009,20,2:4
20Boosting triplet self-trapped exciton emission in Te(IV)-doped Cs_(2)SnCl_(6) perovskite variants显示文摘Perovskite variants have attracted wide interest because of the lead-free nature and strong self-trapped exciton (STE) emission. Divalent Sn(II) in CsSnX3 perovskites is easily oxidized to tetravalent Sn(IV), and the resulted Cs2SnCl6 vacancy-ordered perovskite variant exhibits poor photoluminescence property although it has a direct band gap. Controllable doping is an effective strategy to regulate the optical properties of Cs2SnX6. Herein, combining the first principles calculation and spectral analysis, we attempted to understand the luminescence mechanism of Te4+-doped Cs2SnCl6 lead-free perovskite variants. The chemical potential and defect formation energy are calculated to confirm theoretically the feasible substitutability of tetravalent Te4+ ions in Cs2SnCl6 lattices for the Sn-site. Through analysis of the absorption, emission/excitation, and time-resolved photoluminescence (PL) spectroscopy, the intense green-yellow emission in Te4+:Cs2SnCl6 was considered to originate from the triplet Te(IV) ion 3P1→1S0 STE recombination. Temperature-dependent PL spectra demonstrated the strong electron-phonon coupling that inducing an evident lattice distortion to produce STEs. We further calculated the electronic band structure and molecular orbital levels to reveal the underlying photophysical process. These results will shed light on the doping modulated luminescence properties in stable lead-free Cs2MX6 vacancy-ordered perovskite variants and be helpful to understand the optical properties and physical processes of doped perovskite variants.Ruosheng Zeng Kun Bai Qilin Wei Tong Chang Jun Yan Bao Ke Jialuo Huang Liushun Wang Weichang Zhou Sheng Cao Jialong Zhao Bingsuo Zou 2021Nano Research2021,14,5:4
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