Read by QxMD icon Read

Light-emitting diodes

Andre Maia Chagas, Lucia L Prieto-Godino, Aristides B Arrenberg, Tom Baden
Small, genetically tractable species such as larval zebrafish, Drosophila, or Caenorhabditis elegans have become key model organisms in modern neuroscience. In addition to their low maintenance costs and easy sharing of strains across labs, one key appeal is the possibility to monitor single or groups of animals in a behavioural arena while controlling the activity of select neurons using optogenetic or thermogenetic tools. However, the purchase of a commercial solution for these types of experiments, including an appropriate camera system as well as a controlled behavioural arena, can be costly...
July 2017: PLoS Biology
Yiping Wang, Xin Sun, Zhizhong Chen, Yi-Yang Sun, Shengbai Zhang, Toh-Ming Lu, Esther Wertz, Jian Shi
High-temperature vapor phase epitaxy (VPE) has been proved ubiquitously powerful in enabling high-performance electro-optic devices in III-V semiconductor field. A typical example is the successful growth of p-type GaN by VPE for blue light-emitting diodes. VPE excels as it controls film defects such as point/interface defects and grain boundary, thanks to its high-temperature processing condition and controllable deposition rate. For the first time, single-crystalline high-temperature VPE halide perovskite thin film has been demonstrated-a unique platform on unveiling previously uncovered carrier dynamics in inorganic halide perovskites...
July 18, 2017: Advanced Materials
Nicholas L P Andrews, Travis Ferguson, Alana M M Rangaswamy, Adam Bernicky, Niklas Henning, Alexander Dudelzak, Oliver Reich, Jack A Barnes, Hans-Peter Loock
We present a fluorescence excitation emission spectrometer with superior data acquisition rates over previous instruments. White light from a white light emitting diode (LED) source is dispersed onto a digital micromirror array (DMA) and encoded using binary n-size Walsh functions ("barcodes"). The encoded excitation light is used to irradiate the liquid sample and its fluorescence is dispersed and detected using a conventional array spectrometer. After exposure to excitation light encoded in n different ways, the 2-dimensional EEM spectrum is obtained by inverse Hadamard transformation...
July 18, 2017: Analytical Chemistry
Jeong Hyun Kwon, Seungyeop Choi, Yongmin Jeon, Hyuncheol Kim, Ki Soo Chang, Kyung Cheol Choi
In this study, a new and efficient dielectric-metal-dielectric-based thin-film encapsulation (DMD-TFE) with an inserted Ag thin film is proposed to guarantee the reliability of flexible displays by improving the barrier properties, mechanical flexibility, and heat dissipation, considered as essential requirements for OLED encapsulation. The DMD-TFE, which is composed of Al2O3, Ag, and a silica nanoparticle-embedded sol-gel hybrid nanocomposite, shows a water vapor transmission rate of 8.70 × 10-6 g/m2/day and good mechanical reliability at a bending radius of 30 mm corresponding to 0...
July 18, 2017: ACS Applied Materials & Interfaces
Fabian F Voigt, Florian Emaury, Philipp Bethge, Dominik Waldburger, Sandro M Link, Stefano Carta, Alexander van der Bourg, Fritjof Helmchen, Ursula Keller
We use an ultrafast diode-pumped semiconductor disk laser (SDL) to demonstrate several applications in multiphoton microscopy. The ultrafast SDL is based on an optically pumped Vertical External Cavity Surface Emitting Laser (VECSEL) passively mode-locked with a semiconductor saturable absorber mirror (SESAM) and generates 170-fs pulses at a center wavelength of 1027 nm with a repetition rate of 1.63 GHz. We demonstrate the suitability of this laser for structural and functional multiphoton in vivo imaging in both Drosophila larvae and mice for a variety of fluorophores (including mKate2, tdTomato, Texas Red, OGB-1, and R-CaMP1...
July 1, 2017: Biomedical Optics Express
Jiale Liu, Zhennan Wu, Ye Tian, Yanchun Li, Lin Ai, Tingting Li, Haoyang Zou, Yi Liu, Xindong Zhang, Hao Zhang, Bai Yang
Aggregation-induced emission (AIE) and self-assembly induced emission (SAIE) effects have been employed to tune the emission properties of metal nanoclusters (NCs). However, it is still not possible to further enhance the photoluminescence quantum yields (PLQYs) and control the emission colors of the NCs using AIE and SAIE. On the basis of our recent work studying the contribution of Cu(I) defects in the SAIE of Cu NCs, in this article, Au(I) was doped into Cu NC self-assembled nanosheets (NSASs) to construct a more stable Au(I)-centered state...
July 17, 2017: ACS Applied Materials & Interfaces
Hansjörg Grützmacher, Riccardo Suter, Zoltán Benkö, Mark Bispinghoff
Phosphorus heterocycles find applications in the synthesis of π-conjugated compounds and as precursors for optoelectronic materials such as organic light emitting diodes (OLEDs), electronic switches, and transistors. We report a high yield, one pot synthesis of anionic annulated 1,3,4-azadiphospholides from Na(OCP) and 2-chloro pyridines. The synthesis proceeds without the use of transition metals and tolerates a wide range of substrates. Cyano-substituted compounds are especially deeply colored and have absorption maxima which range from λmax = 525 to 596 nm...
July 17, 2017: Angewandte Chemie
Xue Wang, Keting Bao, Weixing Cao, Yongjun Zhao, Chang Wei Hu
The microalgae-based technology has been developed to reduce biogas slurry nutrients and upgrade biogas simultaneously. In this work, five microalgal strains named Chlorella vulgaris, Scenedesmus obliquus, Selenastrum capricornutum, Nitzschia palea, and Anabaena spiroides under mono- and co-cultivation were used for biogas upgrading. Optimum biogas slurry nutrient reduction could be achieved by co-cultivating microalgae (Chlorella vulgaris, Scenedesmus obliquus, and Nitzschia palea) with fungi using the pelletization technology...
July 14, 2017: Scientific Reports
Chuan He, Weijun Zhu, Baodong Chen, Liang Xu, Tao Jiang, Chang Bao Han, Guang Qin Gu, Dichen Li, Zhong Lin Wang
A smart floor is demonstrated by integrating a square-frame triboelectric nanogenerator (SF-TENG) into a standard wood floor. The smart floor has two working modes based on two pairs of triboelectric materials: one is purposely chosen polytetrafluoroethylene (PTFE) films and aluminum (Al) balls, the other is the floor itself and the objects that can be triboelectrically charged, such as basketball, shoe soles, and scotch tape, etc. Utilizing the Al balls enclosed inside shallow boxes, the smart floor is capable of harvesting vibrational energy, hence provides a non-intrusive way to detect the sudden fall of the elderly...
July 14, 2017: ACS Applied Materials & Interfaces
Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi Yabunaka
Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in this study because non-UV protection layers are present on both sides of the film...
April 2017: Journal of Medical Physics
Mindaugas Gedvilas, Justinas Mikšys, Jonas Berzinš, Valdemar Stankevič, Gediminas Račiukaitis
The evidence of multi-photon absorption enhancement by the dual-wavelength double-pulse laser irradiation in transparent sapphire was demonstrated experimentally and explained theoretically for the first time. Two collinearly combined laser beams with the wavelengths of 1064 nm and 355 nm, inter-pulse delay of 0.1 ns, and pulse duration of 10 ps were used to induce intra-volume modifications in sapphire. The theoretical prediction of using a particular orientation angle of 15 degrees of the half-wave plate for the most efficient absorption of laser irradiation is in good agreement with the experimental data...
July 12, 2017: Scientific Reports
Vijay K Samineni, Jangyeol Yoon, Kaitlyn E Crawford, Yu Ra Jeong, Kajanna C McKenzie, Gunchul Shin, Zhaoqian Xie, Saranya S Sundaram, Yuhang Li, Min Young Yang, Jeonghyun Kim, Di Wu, Yeguang Xue, Xue Feng, Yonggang Huang, Aaron D Mickle, Anthony Banks, Jeong Sook Ha, Judith P Golden, John A Rogers, Robert W Gereau
The advent of optogenetic tools has allowed unprecedented insights into the organization of neuronal networks. Although recently developed technologies have enabled implementation of optogenetics for studies of brain function in freely moving, untethered animals, wireless powering and device durability pose challenges in studies of spinal cord circuits where dynamic, multidimensional motions against hard and soft surrounding tissues can lead to device degradation. We demonstrate here a fully implantable optoelectronic device powered by near-field wireless communication (NFC) technology, with a thin and flexible open-architecture that provides excellent mechanical durability, robust sealing against biofluid penetration and fidelity in wireless activation, thereby allowing for long-term optical stimulation of the spinal cord without constraint on the natural behaviors of the animals...
June 8, 2017: Pain
Zhaofeng Yang, Qianwen Wei, Meizhu Rong, Zhiyu Yang, Zhengliang Wang, Qiang Zhou, Qin Wang
New red-emitting phosphors A2HfF6:Mn(4+) (A = Rb(+), Cs(+)) with a single phase have been successfully synthesized via a simple ion exchange method, and their structures and luminescence properties were investigated. It was found that Mn(4+) ions in Rb2HfF6 and Cs2HfF6 who share wide band gaps can possess broad excitation bands in the blue regions and intense red emission with internal quantum yields of 0.556 and 0.652, respectively. Meanwhile, these red phosphors exhibit high chemical and thermal stabilities...
July 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Yanhong Li, Jigang Zhang, Yanfeng Xu, Yunlin Han, Binbin Jiang, Lan Huang, Hua Zhu, Yuhuan Xu, Weiling Yang, Chuan Qin
Objective To observe the effects of 630 nm red light and 460 nm blue light emitting diode irradiation on the healing of skin wounds in Japanese big-ear white rabbits. Methods The skin wound model was established with 8 Japanese big-ear white rabbits. Three parts of vulnus in each rabbit were used:two parts of vulnus were irradiated vertically by red and blue LED light,respectively(15 min/time),and the distance between lights and wounds was 15 cm;the 3(rd) part of the wound was used as a control. On the 21(st) day of the wounds exposure to light,the number of healing wounds and the percentage of healing area were recorded and the treatment effect of these two light sources was compared...
June 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
Yang Liu, Fushan Li, Zhongwei Xu, Congxiu Zheng, Tailiang Guo, Xiangwei Xie, Lei Qian, Dong Fu, Xiaolin Yan
Quantum dot light emitting diodes (QLEDs) are increasingly attractive owing to their compatibility with ink-jet printing process and the potential application in low-cost large-area full-color pixelated display. The strategy for controlling the morphology of quantum dot layer is definitely critical for realizing all-solution processed QLEDs with high performance, which certainly requires in-depth thinking regarding the design of ink composition and their optimization in the printing process. Herein, by carefully controlling the quantum dot ink composition and physicochemical properties, we demonstrate that the viscosity, contact angle and the three-phase contact line moving would affect the final morphology of quantum dots film formed by inkjet printing...
July 11, 2017: ACS Applied Materials & Interfaces
Antonio J Martínez-Martínez, Stephen Justice, Ben J Fleming, Alan R Kennedy, Iain D H Oswald, Charles T O'Hara
The development of new methodologies to affect non-ortho-functionalization of arenes has emerged as a globally important arena for research, which is key to both fundamental studies and applied technologies. A range of simple arene feedstocks (namely, biphenyl, meta-terphenyl, para-terphenyl, 1,3,5-triphenylbenzene, and biphenylene) is transformed to hitherto unobtainable multi-iodoarenes via an s-block metal sodium magnesiate templated deprotonative approach. These iodoarenes have the potential to be used in a whole host of high-impact transformations, as precursors to key materials in the pharmaceutical, molecular electronic, and nanomaterials industries...
June 2017: Science Advances
Feng-Hsu Fan, Zun-Yao Syu, Chia-Jung Wu, Zhong-Jie Yang, Bo-Song Huang, Guan-Jhong Wang, Yung-Sen Lin, Hsiang Chen, Chyuan Hauer Kao, Chia-Feng Lin
A GaN/AlGaN ultraviolet light emitting diode (UV-LED) structure with a porous AlGaN reflector structure has been demonstrated. Inside the UV-LED, the n(+)-AlGaN/undoped-AlGaN stack structure was transformed into a porous-AlGaN/undoped-AlGaN stack structure through a doping-selective electrochemical etching process. The reflectivity of the porous AlGaN reflector was 93% at 374 nm with a stop-bandwidth of 35 nm. In an angle-dependent reflectance measurement, the central wavelength of the porous AlGaN reflector had blueshift phenomenon by increasing light-incident angle from 10° to 50°...
July 10, 2017: Scientific Reports
Haizhu Sun, Zhenyu Yang, Mingyang Wei, Wei Sun, Xiyan Li, Shuyang Ye, Yongbiao Zhao, Hairen Tan, Emily L Kynaston, Tyler B Schon, Han Yan, Zheng-Hong Lu, Geoffrey A Ozin, Edward H Sargent, Dwight S Seferos
Whereas organic-inorganic hybrid perovskite nanocrystals (PNCs) have remarkable potential in the development of optoelectronic materials, their relatively poor chemical and colloidal stability undermines their performance in optoelectronic devices. Herein, this issue is addressed by passivating PNCs with a class of chemically addressable ligands. The robust ligands effectively protect the PNC surfaces, enhance PNC solution processability, and can be chemically addressed by thermally induced crosslinking or radical-induced polymerization...
July 10, 2017: Advanced Materials
Jinkyoung Yoo, Towfiq Ahmed, Wei Tang, Yong-Jin Kim, Young Joon Hong, Chul-Ho Lee, Gyu-Chul Yi
ZnO radial p-n junction architecture has the potential for forward-leap of light-emitting diode technology in terms of higher efficacy and economical production. We report on ZnO radial p-n junction-based light emitting diodes prepared by full metalorganic chemical vapour deposition (MOCVD) with hydrogen-assisted p-type doping approach. The p-type ZnO(P) thin films were prepared by MOCVD with the precursors of dimethylzinc, tert-butanol, and tertiarybutylphosphine. Controlling the precursor flow for dopant results in systematic change of doping concentration, Hall mobility, and electrical conductivity...
July 10, 2017: Nanotechnology
Ao Liu, Huihui Zhu, Zidong Guo, You Meng, Guoxia Liu, Elvira Fortunato, Rodrigo Martins, Fukai Shan
Low-temperature solution processing opens a new window for the fabrication of oxide semiconductors due to its simple, low cost, and large-area uniformity. Herein, by using solution combustion synthesis (SCS), p-type Cu-doped NiO (Cu:NiO) thin films are fabricated at a temperature lower than 150 °C. The light doping of Cu substitutes the Ni site and disperses the valence band of the NiO matrix, leading to an enhanced p-type conductivity. Their integration into thin-film transistors (TFTs) demonstrates typical p-type semiconducting behavior...
July 10, 2017: Advanced Materials
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"