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https://www.readbyqxmd.com/read/29341604/ce3-doping-to-modulate-photoluminescence-kinetics-for-efficient-cspbbr3-nanocrystals-based-light-emitting-diodes
#1
Jisong Yao, Jing Ge, Bo-Ning Han, Kun-Hua Wang, Hong-Bin Yao, Hao-Lei Yu, Jian-Hai Li, Bai-Sheng Zhu, Jizhong Song, Chen Chen, Qun Zhang, Haibo Zeng, Yi Luo, Shu-Hong Yu
Inorganic perovskite CsPbBr3 nanocrystals (NCs) are emerging, highly attractive light emitters with high color purity and good thermal stability for light-emitting diodes (LEDs). Their high photo/electroluminescence efficiencies are very important for fabricating efficient LEDs. Here, we propose a novel strategy to enhance the photo/electroluminescence efficiency of CsPbBr3 NCs through doping of heterovalent Ce3+ ions via a facile hot-injection method. The Ce3+ cation was chosen as the dopant for CsPbBr3 NCs by virtue of its similar ion radius and formation of higher energy level of conduction band with bromine in comparison with the Pb2+ cation to maintain the integrity of perovskite structure without introducing additional trap states...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29341421/a-stable-room-temperature-luminescent-biphenylmethyl-radical
#2
Xin Ai, Yingxin Chen, Yuting Feng, Feng Li
There is only one family of room-temperature luminescent radicals, the triphenylmethyl radicals, to date. Herein, we synthesize a new stable room-temperature luminescent radical, (N-carbazolyl)bis(2,4,6-tirchlorophenyl)methyl radical (CzBTM), which has improved properties compared to the triphenylmethyl radicals. X-ray crystallography, electron paramagnetic resonance spectroscopy, and magnetic susceptibility measurements confirmed the radical structure. CzBTM shows room-temperature deep-red to near-infrared emission in various solutions...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29341383/co2-triggered-switchable-hydrophilicity-of-heterogeneous-conjugated-polymer-photocatalyst-for-enhanced-catalytic-activity-in-water
#3
Jeehye Byun, Wei Huang, Di Wang, Run Li, Kai A I Zhang
Water-compatibility of heterogeneous photocatalysts has been pursued for energy and environmental applications. However, there exists a trade-off between hydrophilicity and recyclability of the photocatalyst. Herein, we report a conjugated polymer photocatalyst with tertiary amine terminals that reversibly binds CO2 in water, generating a switchable hydrophilicity. The CO2-assisted hydrophilicity boosted up the photocatalytic efficiency in aqueous medium with minimum dosage. When CO2 was desorbed, the photocatalyst could be simply regenerated from reaction media, facilitating the repeated use of photocatalyst...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29341382/synthesis-crystal-analysis-and-optoelectronic-properties-of-diazole-functionalized-acenes-and-azaacenes
#4
Jinchong Xiao, Huahang Pan, Tingting Song, Xiaomeng Yin, Pengcheng Jin
Doping heteroatoms into the skeletons of parent acenes can provide more chances to construct novel thermally and photo-stable organic π-conjugated semiconductors. Herein, a family of diazole-decorated acenes (APyS and APySe) and azaacenes (PyP, PyTh, PyPy, PyPh and PyAP) have been successfully synthesized through the classical reactions. Single crystal X-ray analyses showed that these as-formed diazole-modified derivatives adopted twisted topology configuration, whereas the azaacenes display reclining-chair architectures, besides twisted structure...
January 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29340417/rose-bengal-catalysed-photo-induced-selenylation-of-indoles-imidazoles-and-arenes-a-metal-free-approach
#5
Sumbal Saba, Jamal Rafique, Marcelo S Franco, Alex R Schneider, Leandro Espíndola, Dagoberto O Silva, Antonio L Braga
In this report, the highly efficient Rose Bengal-catalysed C(sp2)-H selenylation of indoles, imidazoles and arenes was achieved using a half molar equiv. of diorganoyl diselenides. This metal-free, photo-induced protocol resulted in selenylated products in good to excellent yields. The reaction features are high yields, an atom-economic, gram-scalable and metal-free approach, and applicability to different biologically relevant (hetero)arenes.
January 17, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29340411/multiplexed-detection-of-nucleic-acids-using-19f-nmr-chemical-shift-changes-based-on-dna-photo-cross-linking-of-3-vinylcarbazole-derivatives
#6
Shigetaka Nakamura, Yasuharu Takashima, Kenzo Fujimoto
The detection methodology for nucleic acids is a useful tool for the analysis of biological systems and diagnosis of diseases. We demonstrated the feasibility of the detection of any nucleic acids based on large chemical shifts via ultrafast DNA photo-cross-linking and the effects of substitution by 3-vinylcarbazole derivatives. These chemical shifts enable the sequence-specific detection of any strand using hybridization chain reaction.
January 17, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29340391/graphene-on-116-faceted-monocrystalline-anatase-nanosheet-array-for-ultraviolet-detection
#7
Yu Liu, Honglei Cai, Fangfang Wang, Jianlin Wang, Qiuping Huang, Zhengping Fu, Yalin Lu
A structure composed of a nanosheet array may trap photons, which could be used to enhance the optical response via resonances; this may be highly useful in ultraviolet (UV) detection, photocatalysis, solar cells, etc. Moreover, anatase nanosheets exposed with the active {001}, {111}, and {116} facets are promising in applications such as Li-ion battery, photocatalysis, and electrochemistry. Therefore, in this study, the {116} faceted single-crystalline anatase nanosheet array with the sheet spacing in the range of several hundred nanometers was directly grown on the transparent conductive substrates...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340390/ultrafast-stimulated-emission-of-nitrophenolates-in-organic-and-aqueous-solutions
#8
N C Michenfelder, H A Ernst, C Schweigert, M Olzmann, A-N Unterreiner
Early-time dynamics of nitroaromatics and its coressponding bases can give valuable insights into photo-induced reactions relevant to atmospheric and environmental processes. In this work, femtosecond broadband absorption spectroscopy between 350 and 700 nm has been applied to explore the ultrafast dynamics of o-, p- and m-nitrophenol anions (NP-) in basic organic and aqueous solution. Excitation at 400 nm promotes these compounds into the first bright electronic singlet state, which is a charge-transfer state...
January 17, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29340358/a-strategy-for-generating-aryl-radicals-from-arylborates-through-organic-photoredox-catalysis-photo-meerwein-type-arylation-of-electron-deficient-alkenes
#9
Y Iwata, Y Tanaka, S Kubosaki, T Morita, Y Yoshimi
Photoinduced reactions of arylboronic acids with electron deficient alkenes under mild organic photoredox catalysis conditions lead to the formation of Meerwein arylation type adducts via the generation of aryl radicals.
January 17, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29339627/corrigendum-water-science-and-technology-76-2-323-336-detoxification-of-photo-catalytically-treated-2-chlorophenol-optimization-through-response-surface-methodology-doi-10-2166-wst-2017-152
#10
Muhammad Z Ahmad, S Ehtisham-Ul-Haque, Numrah Nisar, Khizar Qureshi, Abdul Ghaffar, Mazhar Abbas, Jan Nisar, Munawar Iqbal
No abstract text is available yet for this article.
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339571/infrared-photoconductivity-and-photovoltaic-response-from-nanoscale-domains-of-pbs-alloyed-with-thorium-and-oxygen
#11
Neta Arad-Vosk, Rotem Beach, Amichai Ron, Tzvi Tzvi Templeman, Yuval Golan, Gabby Sarusi, Amir Sa'ar
Thin films of lead sulfide alloyed with thorium and oxygen were deposited on GaAs substrates and processed to produce a photo-diode structure. Structural, optical and electrical characterizations indicate the presence of small nanoscale domains that are characterized by dense packaging, high quality interfaces and a blue-shift of the energy bandgap toward the short wavelength infrared range of the spectrum. Photocurrent spectroscopy revealed a considerable photo-conductivity that is correlated with excitation of carriers in the nanoscale domains of lead sulfide alloyed with thorium and oxygen...
January 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29338202/nanoscale-domain-imaging-of-all-polymer-organic-solar-cells-by-photo-induced-force-microscopy
#12
Kevin L Gu, Yan Zhou, William A Morrison, Katherine Park, Sung Park, Zhenan Bao
Rapid nanoscale imaging of the bulk heterojunction layer in organic solar cells is essential to the continued development of high-performance devices. Unfortunately, commonly used imaging techniques such as tunneling electron microscopy (TEM) and atomic force microscopy (AFM) suffer from significant drawbacks. For instance, assuming domain identity from phase contrast or topographical features can lead to inaccurate morphological conclusions. Here we demonstrate a technique known as Photo-induced Force Microscopy (PiFM) for imaging organic solar cell bulk heterojunctions with nanoscale chemical specificity...
January 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29338085/the-century-experiment-the-first-twenty-years-of-uc-davis-mediterranean-agroecological-experiment
#13
Kristina M Wolf, Emma E Torbert, Dennis Bryant, Martin Burger, R Ford Denison, Israel Herrera, Jan Hopmans, Will Horwath, Stephen Kaffka, Angela Y Y Kong, R F Norris, Johan Six, Thomas P Tomich, Kate M Scow
The Century Experiment at the Russell Ranch Sustainable Agriculture Facility at the University of California, Davis provides long-term agroecological data from row crop systems in California's Central Valley starting in 1993. The Century Experiment was initially designed to study the effects of a gradient of water and nitrogen availability on soil properties and crop performance in ten different cropping systems to measure tradeoffs and synergies between agricultural productivity and sustainability. Currently systems include 11 different cropping systems-consisting of four different crops and a cover crop mixture-and one native grass system...
January 16, 2018: Ecology
https://www.readbyqxmd.com/read/29337565/quantum-control-of-graphene-plasmon-excitation-and-propagation-at-heaviside-potential-steps
#14
Dongli Wang, Xiaodong Fan, Xiaoguang Li, Siyuan Dai, Laiming Wei, Wei Qin, Fei Wu, Huayang Zhang, Zeming Qi, Changgan Zeng, Zhenyu Zhang, Jian Guo Hou
Quantum mechanical effects of single particles can affect the collective plasmon behaviors substantially. In this work, the quantum control of plasmon excitation and propagation in graphene is demonstrated by adopting the variable quantum transmission of carriers at Heaviside potential steps as a tuning knob. First, the plasmon reflection is revealed to be tunable within a broad range by varying the ratio γ between the carrier energy and potential height, which originates from the quantum mechanical effect of carrier propagation at potential steps...
January 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29337555/reconsideration-of-the-detection-and-fluorescence-mechanism-for-a-pyrene-based-chemosensor-for-tnt
#15
Meiheng Lu, Panwang Zhou, Yinhua Ma, Zhe Tang, Yanqiang Yang, Keli Han
Rapid detection of chemical explosives is crucial for national security and public safety, and investigation of sensing mechanisms is important to design highly efficient chemosensors. This study theoretically investigates the detection and fluorescence mechanism of a newly synthesized pyrene based chemosensor for detection of trinitrotoluene (TNT) through density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods, suggesting a different interaction product of the probe and TNT from previously reported ones (Mosca, L...
January 16, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29337381/a-combined-photochemical-and-multi-component-reaction-approach-to-precision-oligomers
#16
Waldemar Konrad, Fabian Raphael Blößer, Katharina Wetzel, Andreas Boukis, Michael Meier, Christopher Barner-Kowollik
We introduce an avenue for the convergent synthesis of linear monodisperse sequence-defined oligomers via a unique approach, combining the Passerini three-component reaction (P 3CR) and a Diels-Alder reaction based on photo-caged dienes. Based on a Passerini linker unit carrying an isocyano group for chain extension via P 3CR and a maleimide moiety for photo-enol conjugation enabling a modular approach for chain extension. Monodisperse oligomers are accessible in a stepwise fashion by switching between both reaction types...
January 16, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29337224/an-experimental-study-for-rapid-detection-and-quantification-of-endodontic-microbiota-following-photo-activated-disinfection-via-new-multiplex-real-time-pcr-assay
#17
Maryam Pourhajibagher, Reza Raoofian, Roghayeh Ghorbanzadeh, Abbas Bahador
BACKGROUND: The infected root canal system harbors one of the highest accumulations of polymicrobial infections. Since the eradication of endopathogenic microbiota is a major goal in endodontic infection therapy, photo-activated disinfection (PAD) can be used as an alternative therapeutic method in endodontic treatment. Compared to cultivation-based approaches, molecular techniques are more reliable for identifying microbial agents associated with endodontic infections. The purpose of this study was to evaluate the ability of designed multiplex real-time PCR protocol for the rapid detection and quantification of six common microorganisms involved in endodontic infection before and after the PAD...
January 11, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29336520/near-infrared-triggered-decomposition-of-nanocapsules-with-high-tumor-accumulation-and-stimuli-responsive-fast-elimination
#18
Dongyuan Zhao, Tiancong Zhao, Peiyuan Wang, Qin Li, Areej Abdulkareem Al-Khalaf, Wael N Hozzein, Fan Zhang, Xiaomin Li
Nanoparticle based diagnosis-therapy integrative systems represent an emerging approach to cancer treatment. However, a series of size-dependent biological barriers impede nanomedicine from clinical implementation, especially the contradiction on optimum sizes for long blood circulation and quick metabolization. Herein, we demonstrate a novel NIR induced decomposable nanocapsule. The nanocapsules are fabricated based on layer-by-layer assembly of azobenzene functionalized polymers and up/downconversion nanoparticles (U/DCNPs)...
January 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29336462/cascaded-photo-potential-in-a-carbon-dot-hematite-system-driving-overall-water-splitting-under-visible-light
#19
Chang'an Liu, Yijun Fu, Yujian Xia, Cheng Zhu, Lulu Hu, Kai Zhang, Haihua Wu, Hui Huang, Yang Liu, Tengfeng Xie, Jun Zhong, Zhenhui Kang
Hematite is an earth-abundant and ubiquitous semiconductor with a suitable bandgap of 2.1 eV for solar water splitting. Unfortunately, it suffers from a low conduction band position compared to the H+/H2 potential and typically an external bias has to be applied. Here, we demonstrate carbon dot-hematite (CD-Fe2O3) nanocomposites as photocatalysts for visible-light-driven overall water splitting without any external bias or scavenger. Notably, the CD-Fe2O3 nanocomposites (carbon dots, 5 wt%) show a hydrogen evolution rate of 0...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336034/quantitative-evaluation-of-collagen-and-elastic-fibers-after-intense-pulsed-light-treatment-of-mouse-skin
#20
Luciana L Faucz, Sonia E Will, Consuelo J Rodrigues, Henrique Hesse, Angelina C Moraes, Durvanei A Maria
BACKGROUND AND OBJECTIVE: The aging of human skin includes intrinsic aging and photo-aging, which are characterized by a decrease in collagen and the deposition of abnormal elastic fibers. Intense pulsed light (IPL) sources are widely used in medicine to treat various cosmetic problems, including photo-damaged skin. Few studies have examined the microscopic changes produced by IPL. The objective of this study was to quantitatively evaluate the effects of IPL on collagen and elastic fibers in mice...
January 16, 2018: Lasers in Surgery and Medicine
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