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https://www.readbyqxmd.com/read/29356026/light-emitting-diodes-in-dermatology-a-systematic-review-of-randomized-controlled-trials
#1
Jared Jagdeo, Evan Austin, Andrew Mamalis, Christopher Wong, Derek Ho, Daniel Siegel
OBJECTIVE: In dermatology, patient and physician adoption of light-emitting diode (LED) medical technology continues to grow as research indicates that LEDs may be used to treat skin conditions. The goal of this systematic review is to critically analyze published randomized controlled trials (RCTs) and provide evidence-based recommendations on the therapeutic uses of LEDs in dermatology based on published efficacy and safety data. METHODS: A systematic review of the published literature on the use of LED treatments for skin conditions was performed on September 13th 2017...
January 22, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29355299/enhancing-the-performance-of-cdse-cds-dot-in-rod-light-emitting-diodes-via-surface-ligand-modification
#2
Prachi Rastogi, Francisco Palazon, Mirko Prato, Francesco Di Stasio, Roman Krahne
The surface ligands on colloidal nanocrystals (NCs) play an important role in the performance of NCs based optoelectronic devices such as photovoltaic cells, photodetectors and light emitting diodes (LEDs). On one hand, the NC emission depends critically on the passivation of the surface to minimize trap states that can provide non-radiative recombination channels. On the other hand, the electrical properties of NC films are dominated by the ligands that constitute the barriers for charge transport from one NC to its neighbor...
January 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29354817/mechanically-stable-ternary-heterogeneous-electrodes-for-energy-storage-and-conversion
#3
Libo Gao, Hongti Zhang, James Utama Surjadi, Peifeng Li, Ying Han, Dong Sun, Yang Lu
Recently, solid asymmetric supercapacitor (ASC) has been deemed as an emerging portable power storage or backup device for harvesting natural resources. Here we rationally engineered a hierarchical, mechanically stable heterostructured FeCo@NiCo layered double hydroxide (LDH) with superior capacitive performance by a simple two-step electrodeposition route for energy storage and conversion. In situ scanning electron microscope (SEM) nanoindentation and electrochemical tests demonstrated the mechanical robustness and good conductivity of FeCo-LDH...
January 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29353685/secondary-and-sucrose-metabolism-regulated-by-different-light-quality-combinations-involved-in-melon-tolerance-to-powdery-mildew
#4
Xin Jing, Hui Wang, Biao Gong, Shiqi Liu, Min Wei, Xizhen Ai, Yan Li, Qinghua Shi
We evaluated the effect of different light combinations on powdery mildew resistance and growth of melon seedlings. Light-emitting diodes were used as the light source and there were five light combinations: white light (420-680 nm); blue light (460 nm); red light (635 nm); RB31 (ratio of red and blue light, 3: 1); and RB71 (ratio of red and blue light, 7: 1). Compared with other treatments, blue light significantly decreased the incidence of powdery mildew in leaves of melon seedlings. Under blue light, H2O2 showed higher accumulation, and the content of phenolics, flavonoid and tannins, as well as expression of the genes involved in synthesis of these substances, significantly increased compared with other treatments before and after infection...
January 4, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29351235/quadrilateral-micro-hole-array-machining-on-invar-thin-film-wet-etching-and-electrochemical-fusion-machining
#5
Woong-Kirl Choi, Seong-Hyun Kim, Seung-Geon Choi, Eun-Sang Lee
Ultra-precision products which contain a micro-hole array have recently shown remarkable demand growth in many fields, especially in the semiconductor and display industries. Photoresist etching and electrochemical machining are widely known as precision methods for machining micro-holes with no residual stress and lower surface roughness on the fabricated products. The Invar shadow masks used for organic light-emitting diodes (OLEDs) contain numerous micro-holes and are currently machined by a photoresist etching method...
January 19, 2018: Materials
https://www.readbyqxmd.com/read/29350516/time-dependent-density-functional-theory-for-open-systems-and-its-applications
#6
Shuguang Chen, YanHo Kwok, GuanHua Chen
Photovoltaic devices, electrochemical cells, catalysis processes, light emitting diodes, scanning tunneling microscopes, molecular electronics, and related devices have one thing in common: open quantum systems where energy and matter are not conserved. Traditionally quantum chemistry is confined to isolated and closed systems, while quantum dissipation theory studies open quantum systems. The key quantity in quantum dissipation theory is the reduced system density matrix. As the reduced system density matrix is an O(M! × M!) matrix, where M is the number of the particles of the system of interest, quantum dissipation theory can only be employed to simulate systems of a few particles or degrees of freedom...
January 19, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29349780/protective-effect-of-bled-exposed-conditioned-media-on-cell-injury
#7
Phil-Sun Oh, Eun-Mi Kim, Minjoo Kim, In Sun Kim, Yeon-Hee Han, SeokTae Lim, Myung-Hee Sohn, Myoung-Hwan Ko, Hwan-Jeong Jeong
Previous studies have reported that 450 nm blue light emitting diode (BLED) induces apoptosis through a mitochondria-mediated pathway in cancer cells and reduces the early stage tumor growth. The present study was performed to determine the effects of BLED-irradiated cell metabolites on cell injury. Our results showed that conditioned medium (CM) from cells irradiated with low-dose BLED (LCM) inhibited apoptosis and increased cell survival. Cell protection-related proteins were identified in cell metabolites of CM and LCM using 2-DE and MALDI-TOF analysis...
January 19, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29349511/treatment-of-severe-periodontitis-with-a-laser-and-light-emitting-diode-led-procedure-adjunctive-to-scaling-and-root-planing-a-double-blind-randomized-single-center-split-mouth-clinical-trial-investigating-its-efficacy-and-patient-reported-outcomes-at-1%C3%A2-year
#8
Marco Giannelli, Fabrizio Materassi, Tiziana Fossi, Luca Lorenzini, Daniele Bani
Broad methodological heterogeneity makes the literature on the clinical effects of laser treatment in periodontitis, both as monotherapy and adjunct to non-surgical therapy, which is difficult to interpret. The present split-mouth study was performed: (i) to determine the efficacy and safety of a photoablative-photodynamic diode laser therapy, including antiseptic LED irradiation, in adjunct to scaling and root planing (iPAPD+SRP) vs. sham-treatment+SRP for the treatment of diffuse severe periodontitis and (ii) to estimate the patient-reported outcomes...
January 18, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29348898/avoiding-thermal-injury-during-near-infrared-photoimmunotherapy-nir-pit-the-importance-of-nir-light-power-density
#9
Shuhei Okuyama, Tadanobu Nagaya, Fusa Ogata, Yasuhiro Maruoka, Kazuhide Sato, Yuko Nakamura, Peter L Choyke, Hisataka Kobayashi
Near-infrared photoimmunotherapy (NIR-PIT) is a newly-established cancer treatment which employs the combination of an antibody-photoabsorber conjugate (APC) and NIR light. When NIR light is absorbed by APC-bound tissues, a certain amount of heat is generated locally. For the most part this results in a subclinical rise in skin temperature, however, excessive light exposure may cause non-specific thermal damage. In this study, we investigated the potential for thermal damage caused by NIR-PIT by measuring surface temperature...
December 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29348061/effects-of-wavelength-mixing-ratio-and-photoperiod-on-microalgal-biomass-and-lipid-production-in-a-two-phase-culture-system-using-led-illumination
#10
Phunlap Sirisuk, Chae-Hun Ra, Gwi-Taek Jeong, Sung-Koo Kim
Blue and red light-emitting diodes (LEDs) were used to study the effects of wavelength mixing ratios, photoperiod regimes, and green wavelength stress on Nannochloropsis salina, Isochrysis galbana, and Phaeodactylum tricornutum cell biomass and lipid production. The maximum specific growth rates of I. galbana and P. tricornutum were obtained under a 50:50 mixing ratio of blue and red wavelength LEDs; that of N. salina was obtained under red LED. Maximum cell biomass for N. salina and P. tricornutum was 0.75 and 1...
January 4, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29345952/visible-light-enabled-preparation-of-palladium-nanoparticles-and-application-as-catalysts-for-suzuki-miyaura-coupling
#11
Florian Mäsing, Harald Nüsse, Jürgen Klingauf, Armido Studer
Silyl ketones were used for the preparation of palladium nanoparticles (PdNPs) starting with Pd(OAc)2 in dimethylformamide under irradiation with a visible light-emitting diode (LED). Variation of the silyl ketone structure allowed adjustment of the PdNP diameter (1.9 or 5.2 nm). The in situ-formed PdNPs were further stabilized with polyvinylpyrrolidone and then applied as recyclable catalysts in the Suzuki-Miyaura coupling of arylboronic acids with aryl iodides to obtain substituted biphenyls in excellent yields...
January 18, 2018: Organic Letters
https://www.readbyqxmd.com/read/29345903/light-emitting-diodes-based-on-colloidal-silicon-quantum-dots-with-octyl-and-phenylpropyl-ligands
#12
Xiangkai Liu, Shuangyi Zhao, Wei Gu, Yuting Zhang, Xvsheng Qiao, Zhenyi Ni, Xiaodong Pi, Deren Yang
Colloidal silicon quantum dots (Si QDs) hold ever-growing promise for the development of novel optoelectronic devices such as light-emitting diodes (LEDs). Although it has been proposed that ligands at the surface of colloidal Si QDs may significantly impact the performance of LEDs based on colloidal Si QDs, little systematic work has been carried out to compare the performance of LEDs that are fabricated by using colloidal Si QDs with different ligands. Here colloidal Si QDs with rather short octyl ligands (Octyl-Si QDs) and phenylpropyl ligands (PhPr-Si QDs) are employed for the fabrication of LEDs...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345704/hierarchical-core-shell-structures-of-p-ni-oh-2-rods-mno2-nanosheets-as-high-performance-cathode-materials-for-asymmetric-supercapacitors
#13
Kunzhen Li, Shikuo Li, Fangzhi Huang, Xin-Yao Yu, Yan Lu, Lei Wang, Hong Chen, Hui Zhang
The hierarchical porous structure with phosphorus-doped Ni(OH)2 (P-Ni(OH)2) rods as the core and MnO2 nanosheets as the shell is fabricated directly by growth on a three-dimensional (3D) flexible Ni foam (NF) via a two-step hydrothermal process. As a binder-free electrode material, this unique hybrid structure exhibits excellent electrochemical properties, including an ultrahigh areal capacitance of 5.75 F cm-2 at a current density of 2 mA cm-2 and great cyclic stability without capacitance loss at a current density of 20 mA cm-2 after 10 000 cycles...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29345133/stable-organic-radicals-as-hole-injection-dopants-for-efficient-optoelectronics
#14
Zhengyang Bin, Haoqing Guo, Ziyang Liu, Feng Li, Lian Duan
Precursors of reactive organic radicals have been widely used as n-dopants in electron-transporting materials to improve electron-conductivity and enhance electron-injection. However, the utilization of organic radicals in hole-counterparts has been ignored. In this work, stable organic radicals have been proved for the first time to be efficient dopants to enhance hole injection. From the absorbance spectra and the ultraviolet photoelectron spectra, we could observe an efficient electron transfer between the organic radical (4-N-carbazolyl-2,6-dichlorophenyl)bis(2,4,6-trichlorophenyl)methyl, TTM-1Cz) and the widely used hole injection material (1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile, HAT-CN)...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29342878/improved-photo-ignition-of-carbon-nanotubes-ferrocene-using-a-lipophilic-porphyrin-under-white-power-led-irradiation
#15
Paolo Visconti, Patrizio Primiceri, Roberto de Fazio, Antonio Paolo Carlucci, Selma Elaine Mazzetto, Giuseppe Mele
The aim of this work is to investigate and characterize the photo-ignition process of dry multi-walled carbon nanotubes (MWCNTs) mixed with ferrocene (FeCp₂) powder, using an LED (light-emitting diode) as the light source, a combination that has never been used, to the best of our knowledge. The ignition process was improved by adding a lipophilic porphyrin (H₂Pp) in powder to the MWCNTs/FeCp₂ mixtures-thus, a lower ignition threshold was obtained. The ignition tests were carried out by employing a continuous emission and a pulsed white LED in two test campaigns...
January 13, 2018: Materials
https://www.readbyqxmd.com/read/29342095/preparation-of-cyano-substituted-tetraphenylethylene-derivatives-and-their-applications-in-solution-processable-oleds
#16
Xiaoyi Sun, Lele Zhao, Xiao Han, Hui Liu, Yu Gao, Yanchun Tao, Haiquan Zhang, Bing Yang, Ping Lu
Creation of organic luminescent materials with high solid-state efficiency is of vital importance for their applications in optoelectronic fields. Here, a series of AIE luminogens (AIE gens), (Z)-2,3-bis(4-(9,9-bis(6-(9H-carbazol-9-yl)hexyl)-9H-fluoren-2-yl)phenyl)-3-phenylacrylonitrile (SFC), and 2,3-bis(4-(9,9-bis(6-(9H-carbazol-9-yl)hexyl)-9H-fluoren-2-yl)phenyl)fumaronitrile (DFC), utilizing 2,3,3-triphenylacrylonitrile and 2,3-diphenylfumaronitrile as respective centers, are designed and synthesized by Suzuki coupling reactions with high yields...
January 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29341604/ce3-doping-to-modulate-photoluminescence-kinetics-for-efficient-cspbbr3-nanocrystals-based-light-emitting-diodes
#17
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/29341425/synthesis-of-novel-dy3-activated-ba2-cazn2-si6-o17-phosphors-for-white-light-emitting-diodes
#18
G Annadurai, S Masilla Moses Kennedy, V Sivakumar
Dysprosium ion (Dy3+ ) activated Ba2 CaZn2 Si6 O17 phosphors were synthesized using high temperature solid-state reaction method. Powder X-ray diffraction (PXRD) analysis confirmed the phase formation of the as-prepared phosphors. Scanning electron microscopy (SEM) analysis disclosed an agglomeration of particles with an irregular morphology. Under 350 nm excitation, the emission spectrum of Dy3+ ions showed bands at 481 nm (blue), 577 nm (yellow) and 674 nm (red). The influence of the Dy3+ concentration on its emission intensity was investigated...
January 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29339304/transformation-products-formation-of-ciprofloxacin-in-uva-led-and-uva-led-tio2-systems-impact-of-natural-organic-matter-characteristics
#19
Si Li, Jiangyong Hu
The role of natural organic matter (NOM) in contaminants removal by photolysis and photocatalysis has aroused increasing interest. However, evaluation of the influence of NOM characteristics on the transformation products (TPs) formation and transformation pathways of contaminants has rarely been performed. This study investigated the decomposition kinetics, mineralization, TPs formation and transformation pathways of antibiotic ciprofloxacin (CIP) during photolysis and photocatalysis in the presence of three commercial NOM isolates (Sigma-Aldrich humic acid (SAHA), Suwannee River humic acid (SRHA) and Suwannee River NOM (SRNOM)) by using UVA light emitting diode (UVA/LED) as an alternative light source...
January 9, 2018: Water Research
https://www.readbyqxmd.com/read/29338169/highly-efficient-soluble-blue-delayed-fluorescent-and-hyperfluorescent-organic-light-emitting-diodes-by-host-engineering
#20
Sang Kyu Jeon, Hee-Jun Park, Jun Yeob Lee
Solution processed high efficiency fluorescent organic light-emitting diodes with an external quantum efficiency over 18% was developed by engineering a host material and device structure designed for solution process. A high triplet energy host material designed for solution process, (oxybis(3-(tert-butyl)-6,1-phenylene))bis(diphenylphosphine oxide) (DPOBBPE), worked efficiently as the host of blue fluorescent device due to good solubility, high photoluminescence quantum yield and good film properties. The DPOBBPE host enabled high external quantum efficiency of 18...
January 17, 2018: ACS Applied Materials & Interfaces
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