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https://www.readbyqxmd.com/read/29342114/gan-based-laser-wireless-power-transfer-system
#1
Carlo De Santi, Matteo Meneghini, Alessandro Caria, Ezgi Dogmus, Malek Zegaoui, Farid Medjdoub, Boris Kalinic, Tiziana Cesca, Gaudenzio Meneghesso, Enrico Zanoni
The aim of this work is to present a potential application of gallium nitride-based optoelectronic devices. By using a laser diode and a photodetector, we designed and demonstrated a free-space compact and lightweight wireless power transfer system, whose efficiency is limited by the efficiency of the receiver. We analyzed the effect of the electrical load, temperature, partial absorption and optical excitation distribution on the efficiency, by identifying heating and band-filling as the most impactful processes...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29342095/preparation-of-cyano-substituted-tetraphenylethylene-derivatives-and-their-applications-in-solution-processable-oleds
#2
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
#3
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/29341542/intrinsic-fluorescence-for-cervical-precancer-detection-using-polarized-light-based-in-house-fabricated-portable-device
#4
Bharat Lal Meena, Pankaj Singh, Amar Nath Sah, Kiran Pandey, Asha Agarwal, Chayanika Pantola, Asima Pradhan
An in-house fabricated portable device has been tested to detect cervical precancer through the intrinsic fluorescence from human cervix of the whole uterus in a clinical setting. A previously validated technique based on simultaneously acquired polarized fluorescence and polarized elastic scattering spectra from a turbid medium is used to extract the intrinsic fluorescence. Using a diode laser at 405 nm, intrinsic fluorescence of flavin adenine dinucleotide, which is the dominant fluorophore and other contributing fluorophores in the epithelium of cervical tissue, has been extracted...
January 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29341541/radiotherapy-fiber-dosimeter-probes-based-on-silver-only-coated-hollow-glass-waveguides
#5
Arash Darafsheh, Jeffrey E Melzer, James A Harrington, Alireza Kassaee, Jarod C Finlay
Manifestation of Čerenkov radiation as a contaminating signal is a significant issue in radiation therapy dose measurement by fiber-coupled scintillator dosimeters. To enhance the scintillation signal transmission while minimizing Čerenkov radiation contamination, we designed a fiber probe using a silver-only coated hollow waveguide (HWG). The HWG with scintillator inserted in its tip, embedded in tissue-mimicking phantoms, was irradiated with clinical electron and photon beams generated by a medical linear accelerator...
January 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29341425/synthesis-of-novel-dy3-activated-ba2-cazn2-si6-o17-phosphors-for-white-light-emitting-diodes
#6
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/29339571/infrared-photoconductivity-and-photovoltaic-response-from-nanoscale-domains-of-pbs-alloyed-with-thorium-and-oxygen
#7
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/29339304/transformation-products-formation-of-ciprofloxacin-in-uva-led-and-uva-led-tio2-systems-impact-of-natural-organic-matter-characteristics
#8
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
#9
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
https://www.readbyqxmd.com/read/29337369/hepatoprotective-effects-of-the-honey-of-apis-cerana-fabricius-on-bromobenzene-induced-liver-damage-in-mice
#10
Haoan Zhao, Ni Cheng, Liangliang He, Guoxia Peng, Qingqing Liu, Tianchen Ma, Wei Cao
Apis cerana honey (honey of Apis cerana Fabricius), widely distributed in the mountain areas of East Asia, has not been studied fully. The hepatoprotective activity of A. cerana honey was evaluated against bromobenzene-induced liver damage in mice. In high dose, A. cerana honey can significantly alleviate liver injury, as is indicated by the depressed levels of serum alanine aminotransferase (ALT) (59.13%) and aspartate aminotransferase (AST) (79.71%), the inhibited malondialdehyde (MDA) content (63.30%), the elevated activities of superoxide dismutase (SOD) (73...
January 16, 2018: Journal of Food Science
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
#11
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/29336547/efficient-blue-and-yellow-organic-light-emitting-diodes-enabled-by-aggregation-induced-emission
#12
N Venkatramaiah, G Dinesh Kumar, Yogesh Chandrasekaran, Ramesh Ganduri, Satish Patil
A new class of donor-bridge-acceptor (D-π-A) π-conjugated light-emitting molecules comprising carbazole as donor and maleimide (Cbz-MI, Cbz-MI(d)), phthalimide (Cbz-Pth) as acceptor units with phenyl ring as spacer have been synthesized in good yields. These compounds exhibit high quantum yield with three distinct emission colors yellowish-green (Cbz-MI), bright yellow Cbz-MI(d), and sky blue (Cbz-Pth) in the solid state. Single-crystal X-ray and quantum chemical calculations reveals that twisting of the phenyl rings with high torsional angle on maleimide and phthalimide units reduce the effective inter-chromophore electronic coupling, furnish dramatic changes in their photophysical properties in solution and solid states...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29336353/perovskite-nanocrystals-across-dimensional-attachment-film-scale-assembly-on-flexible-substrate-and-their-fluorescence-properties
#13
Wenyi Huang, Jiajia Liu, Bing Bai, Liu Huang, Meng Xu, Jia Liu, Hongpan Rong, Jiatao Zhang
Perovskite nanocrystals (NCs), a good fluorescent candidate for excellent photoelectric properties, have opened new avenues in the fabrication of highly efficient solar cells, light-emitting diodes (LEDs), and other optoelectronic devices. Further advances will rely on the multitude of compositional, structural variants that enable the formation of lower-dimensionality layered and three-dimensional (3D) perovskites with architectural innovations. In this work, the perovskite film was fabricated on the flexible substrate by simple dip-coating technology and 3D assemblies of perovskite NCs were obtained through an attachment process...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29335594/interfacial-coupling-effect-on-electron-transport-in-mos2-srtio3-heterostructure-an-ab-initio-study
#14
Amreen Bano, N K Gaur
A variety of theoretical and experimental works have reported several potential applications of MoS2 monolayer based heterostructures (HSs) such as light emitting diodes, photodetectors and field effect transistors etc. In the present work, we have theoretically performed as a model case study, MoS2 monolayer deposited over insulating SrTiO3 (001) to study the band alignment at TiO2 termination. The interfacial characteristics are found to be highly dependent on the interface termination. With an insulating oxide material, a significant band gap (0...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335503/tuning-charge-carrier-transport-and-optical-birefringence-in-liquid-crystalline-thin-films-a-new-design-space-for-organic-light-emitting-diodes
#15
Chang-Min Keum, Shiyi Liu, Akram Al-Shadeedi, Vikash Kaphle, Michiel Koen Callens, Lu Han, Kristiaan Neyts, Hongping Zhao, Malte C Gather, Scott D Bunge, Robert J Twieg, Antal Jakli, Björn Lüssem
Liquid-crystalline organic semiconductors exhibit unique properties that make them highly interesting for organic optoelectronic applications. Their optical and electrical anisotropies and the possibility to control the alignment of the liquid-crystalline semiconductor allow not only to optimize charge carrier transport, but to tune the optical property of organic thin-film devices as well. In this study, the molecular orientation in a liquid-crystalline semiconductor film is tuned by a novel blading process as well as by different annealing protocols...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334653/depletion-study-withdrawal-period-calculation-and-bioaccumulation-of-sulfamethazine-in-tilapia-oreochromis-niloticus-treated-with-medicated-feed
#16
Kátia S D Nunes, José H Vallim, Márcia R Assalin, Sonia C N Queiroz, Lourival C Paraíba, Claudio M Jonsson, Felix G R Reyes
The residue depletion of sulfamethazine (SMZ) was evaluated in tilapia (Oreochromis niloticus) after 11 days of administration of medicated feed containing SMZ, at the dose of 422 mg/kg body weight (bw). The determination of SMZ in feed and tilapia fillet was carried out using the QuEChERS approach for sample preparation, and high performance liquid chromatography with diode array detector (HPLC-DAD) and ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-QToF-MS) for quantitation, respectively...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334099/composition-dependent-emission-linewidth-broadening-in-lead-bromide-perovskite-apbbr3-a-cs-and-ch3nh3-nanoparticles
#17
Sujin Ham, Heejae Chung, Tae-Woo Kim, Jiwon Kim, Dongho Kim
Lead halide perovskite nanoparticles (NPs) are attractive as they exhibit excellent color purity and have a tunable band gap, and can thus be applied in highly efficient photovoltaic and light-emitting diodes. Fundamental studies of emission linewidth broadening due to spectral shifts in perovskite NPs may suggest a way to improve their color purity. However, the carrier-induced Stark shift that causes spectral diffusion still requires investigation. In this study, we explore composition-related emission linewidth broadening by comparing CsPbBr3 and CH3NH3PbBr3 (MAPbBr3) perovskite NPs...
January 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29333875/ultrafast-determination-of-vitamin-e-using-lc-esi-ms-ms-for-preclinical-development-of-new-nutraceutical-formulations
#18
Noemi Villaseca-González, Virginia Rodríguez Robledo, Lucía Castro-Vázquez, María Victoria Lozano, Manuel J Santander-Ortega, Joaquín González-Fuentes, Pilar Marcos, María Del Mar Arroyo-Jiménez
AIM: We proposed a rapid and high quality method to determine α-tocopherol (α-T) in different biopharmaceutical samples using liquid chromatography-diode array detector on-line ESI-MS/MS. MATERIALS & METHODS: A working standard solution of α-T and internal standard, phenyl-5,7-dimethyl-d6-α-tocopherol, were used for optimization and validation of the method. Levels of α-T in nanoemulsions, serum and plasma samples were evaluated. RESULTS & CONCLUSION: Precision (1% for retention time, 5% for peak area and 3% for relative peak area), linearity range (among 0...
January 15, 2018: Bioanalysis
https://www.readbyqxmd.com/read/29333627/saturable-absorption-in-2d-ti3-c2-mxene-thin-films-for-passive-photonic-diodes
#19
Yongchang Dong, Sergii Chertopalov, Kathleen Maleski, Babak Anasori, Longyu Hu, Sriparna Bhattacharya, Apparao M Rao, Yury Gogotsi, Vadym N Mochalin, Ramakrishna Podila
MXenes comprise a new class of 2D transition metal carbides, nitrides, and carbonitrides that exhibit unique light-matter interactions. Recently, 2D Ti3 CNTx (Tx represents functional groups such as OH and F) was found to exhibit nonlinear saturable absorption (SA) or increased transmittance at higher light fluences, which is useful for mode locking in fiber-based femtosecond lasers. However, the fundamental origin and thickness dependence of SA behavior in MXenes remain to be understood. 2D Ti3 C2 Tx thin films of different thicknesses are fabricated using an interfacial film formation technique to systematically study their nonlinear optical properties...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333093/bactericidal-effects-of-deep-ultraviolet-light-emitting-diode-for-solutions-during-intravenous-infusion
#20
Sachiko Omotani, Katsuji Tani, Mai Aoe, Seiji Esaki, Katsuhito Nagai, Yasutoshi Hatsuda, Junji Mukai, Hitomi Teramachi, Michiaki Myotoku
Background: Ultraviolet irradiation is effectively used as a disinfection method for inactivating microorganisms. Methods: We investigated the bactericidal effects by irradiation with a deep-ultraviolet light-emitting diode (DUV-LED) on the causative microorganisms of catheter related blood stream infection contaminating the solution for intravenous infusion. For irradiation, prototype modules for water disinfection with a DUV-LED were used. Experiments were conducted on five kinds of microorganisms. We examined the dependence of bactericidal action on eleven solutions...
2018: International Journal of Medical Sciences
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