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https://www.readbyqxmd.com/read/28431206/phase-transfer-ligand-exchange-of-lead-chalcogenide-quantum-dots-for-direct-deposition-of-thick-highly-conductive-films
#1
Qianglu Lin, Hyeong Jin Yun, Wenyong Liu, Hyung-Jun Song, Nikolay S Makarov, Oleksandr Isaienko, Tom Nakotte, Gen Chen, Hongmei Luo, Victor I Klimov, Jeffrey M Pietryga
The use of semiconductor nanocrystal quantum dots (QDs) in optoelectronic devices typically requires post-synthetic chemical surface treatments to enhance electronic coupling between QDs and allow for efficient charge transport in QD films. Despite their importance to solar cells, and infrared (IR) light-emitting diodes and photodetectors, advances in these chemical treatments for lead chalcogenide (PbE, E = S, Se, Te) QDs have lagged behind those of, for instance, II-VI semiconductor QDs. Here, we introduce a method for fast and effective ligand exchange for PbE QDs in solution, resulting in QDs completely passivated by a wide range of small anionic ligands...
April 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28430343/fabrication-and-characterization-of-indium-tin-oxide-films
#2
Shiuh-Chuan Her, Chun-Fu Chang
BACKGROUND: Transparent conducting oxide (TCO) films are of particular interest in the field of optoelectronics, due to the requirement for transparent electrodes in applications such as organic light-emitting diodes, solar cells and so on. The aim of this study was to obtain a better understanding of the effects of preparation temperature on indium tin oxide (ITO) films, to improve their performance for optoelectronic applications. METHODS: ITO films were deposited on glass substrate at different temperatures, using direct current (DC) magnetron sputtering...
April 5, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28430260/optical-performance-enhancement-of-chip-on-board-light-emitting-diodes-through-ionic-wind-patterning
#3
Jiading Wu, Jingcao Chu, Zefeng Zhang, Jiahui Huang, Huai Zheng, Sheng Liu
Due to the total internal reflection at the upper interface of the encapsulation layer, the light extraction efficiency (LEE) of chip-on-board packaging light-emitting diodes is attenuated significantly. It is well known that the LEE can be enhanced by patterning the encapsulation layer. In this study, a novel method of patterning the encapsulation layer, which is based on the interaction between the ionic wind and liquid encapsulation, is proposed and demonstrated. Two kinds of encapsulation patterns, namely dual stripe and meniscus, were fabricated successfully...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430242/thermally-stable-wleds-with-excellent-luminous-properties-by-screen-printing-a-patterned-phosphor-glass-layer-on-a-microstructured-glass-plate
#4
Yang Peng, Xing Guo, Ruixin Li, Hao Cheng, Mingxiang Chen
In order to improve the luminous properties and thermal reliability of white light-emitting diodes (WLEDs), we proposed a promising phosphor-in-glass (PiG) converter, which was prepared by screen-printing a patterned phosphor glass layer on a microstructured glass plate. The patterned layer achieves four-quadrant phosphor geometry based on separated yellow Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> (YAG:Ce<sup>3+</sup>) and red CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> (CASN:Eu<sup>2+</sup>) phosphor parts...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430208/illumination-data-transmission-and-energy-harvesting-the-threefold-advantage-of-vlc
#5
Harilaos G Sandalidis, Alexander Vavoulas, Theodoros A Tsiftsis, Nicholas Vaiopoulos
Visible light communication (VLC) is a promising technology that meets illumination and information transmission requirements in an indoor environment. Because light waves convey energy, a VLC link may exploit that fact for energy harvesting purposes. In this context, a single light emitting diode lamp located at a close distance over a tablet or laptop PC can potentially offer simultaneous lighting, Internet access, and battery recharging without cables. The present study introduces this threefold role of VLC systems by properly adapting some energy harvesting receiver architectures recently launched for usage in RF communications...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429598/preliminary-clinical-validation-of-a-differential-correction-method-for-improving-measurement-accuracy-in-noninvasive-measurement-of-blood-glucose-using-near-infrared-spectroscopy
#6
Guang Han, Xuyao Yu, Dandan Xia, Rong Liu, Jin Liu, Kexin Xu
One of the main challenges in the noninvasive sensing of blood glucose by near-infrared (NIR) spectroscopy is the background variations from light source drift, sweating, and temperature change at the human-machine interface. In this paper, a differential correction method based on the spectra from the floating-reference position and measuring position is proposed to eliminate these spectral variations from background interferences. Its effectiveness was validated by in vitro and in vivo experiments in which the diffuse reflectance of intralipid solutions and human skin was collected at the source distances of 0...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28429193/effect-of-non-coherent-infrared-light-led-%C3%AE-945%C3%A2-%C3%A2-%C3%A2-20%C3%A2-nm-on-bone-repair-in-diabetic-rats-morphometric-and-spectral-analyses
#7
Alexandre Greca Diamantino, Renata Amadei Nicolau, Davidson Ribeiro Costa, Alessandra Paes de Barros Almeida, Danila Xênia de Miranda Mato, Marco Antonio de Oliveira, Ana Maria do Espírito Santo
Phototherapy using coherent light (lasers) and non-coherent light (light-emitting diodes (LEDs)) has been investigated for the purpose of biomodulation in biological tissues. Several effects can be expected, including pain moderation, biostimulation of cellular tropism, anti-inflammatory effects, regular circulatory stimulation, and tissue repair. The aim of this study was to evaluate the effect of LED (λ945 ± 20 nm, 48 mW) therapy on the regeneration process in femoral lesions of rats (Wistar). Seven irradiation sessions were held, with a 48-h interval between sessions...
April 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28427902/effects-of-different-green-light-intensities-on-the-growth-performance-and-endocrine-properties-of-barfin-flounder-verasper-moseri
#8
Akiyoshi Takahashi, Satoshi Kasagi, Naoto Murakami, Sumihisa Furufuji, Shigeto Kikuchi, Kanta Mizusawa, Tadashi Andoh
We previously reported that the somatic growth of barfin flounder, Verasper moseri, was effectively stimulated by the green light compared to the blue and red lights. Herein, we report the effects of different green light intensities on the growth and endocrine system of the fish. Fish were reared in a dark room with light from a light-emitting diode (LED) at a peak wavelength of 518 nm under controlled photoperiod (10.5:13.5 h, light:dark cycle; 06:00-16:30, light) with three levels of photon flux density (PFD)-2 (low), 7 (medium), or 21 (high) μmol·m(-2)·s(-1) at the water surface...
April 17, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28422435/blue-organic-light-emitting-diodes-based-on-fluorene-bridged-quinazoline-and-quinoxaline-derivatives
#9
Dong Young Kim, Jisu Kang, Song Eun Lee, Young Kwan Kim, Seung Soo Yoon
Two blue emitters based on fluorene-bridged quinazoline and quinoxaline derivatives were prepared via the Suzuki reaction. Their photoluminescent properties were investigated. Furthermore, theoretical studies on these materials using the density functional theory calculation were conducted. To explore their electroluminescent properties, multilayered organic light-emitting diodes were fabricated with the following device structure: indium-tin-oxide (180 nm)/4,4'-bis(N-(1-naphthyl)-N-phenylamino)biphenyl (50 nm)/blue emitting materials (1 and 2) (30 nm)/bathophenanthroline (35 nm)/8-hydroxy-quinolinato lithium (2 nm)/Al (100 nm)...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422046/nanowelding-and-patterning-of-silver-nanowires-via-mask-free-atmospheric-cold-plasma-jet-scanning
#10
Lang Liu, Han-Yu Li, Dong Ye, Yao Yu, Lin Liu, Yue Wu
Silver nanowire (AgNW) thin film is a promising candidate to replace traditional indium tin oxide in optoelectronics applications. To date however, the widespread application of AgNW thin film is limited by the weak point contacts between individual AgNWs and the lack of facile patterning techniques. Here, we demonstrate a novel and facile method to not only nanoweld AgNW junctions but also pattern AgNW thin films via mask-free cold plasma-jet scanning in ambient conditions. After the plasma-jet nanowelding treatment, the morphology of AgNWs change substantially and the junctions are welded together...
April 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28421740/enhancing-the-performance-of-quantum-dot-light-emitting-diodes-using-room-temperature-processed-ga-doped-zno-nanoparticles-as-the-electron-transport-layer
#11
Sheng Cao, Jinju Zheng, Jialong Zhao, Zuobao Yang, Chengming Li, Xinwei Guan, Weiyou Yang, Minghui Shang, Tom Wu
Colloidal ZnO nanoparticle (NP) films are recognized as efficient electron transport layers (ETLs) for quantum dot light-emitting diodes (QD-LEDs) with good stability and high efficiency. However, because of the inherently high work function of such films, spontaneous charge transfer occurs at the QD/ZnO interface in such a QD-LED, thus leading to reduced performance. Here, to improve the QD-LED performance, we prepared Ga-doped ZnO NPs with low work functions and tailored band structures via a room-temperature (RT) solution process without the use of bulky organic ligands...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28418056/unprecedented-thermal-condensation-of-tetracyanocyclopropanes-to-triazaphenalenes-a-facile-route-for-the-design-of-novel-materials-for-electronic-applications
#12
Iliya E Kuznetsov, Diana K Susarova, Lyubov A Frolova, Alexander S Peregudov, Alexander F Shestakov, Sergey I Troyanov, Keith J Stevenson, Pavel A Troshin
We report an unusual thermal condensation of readily available tetracyanocyclopropanes to tetracyanosubstituted triazaphenalenes, which revealed interesting optoelectronic properties such as strongly pronounced solvatochromism and bright photoluminescence. Optical memory elements and organic light emitting diodes with a deep red electroluminescence were designed using triazaphenalenes, thus highlighting the potential of these compounds as materials for electronic applications.
April 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28417631/inkjet-printed-quantum-dot-light-emitting-diodes-with-an-air-stable-hole-transport-material
#13
Zhenhua Xing, Jinyong Zhuang, Changting Wei, Dongyu Zhang, Zhong-Zhi Xie, Xiao-Ping Xu, Shun-Jun Ji, Jian-Xin Tang, Wenming Su, Zheng Cui
High efficiency quantum dots light emitting diodes (QLEDs) have been fabricated by inkjet printing with a novel cross-linkable hole transport material N,N'-(9,9'-spirobi[fluorene]-2,7-diylbis(4,1-phenylene))bis(N-phenyl-4'-vinyl-[1,1'-biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability and a highest occupied molecular orbital (HOMO) level of -5.54 eV. The inkjet printed SDTF film is very smooth and uniform with a roughness as low as 0.37 nm, which is comparable with the spin-coated film (0...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28417574/light-emitting-diode-treatment-ameliorates-allergic-lung-inflammation-in-experimental-model-of-asthma-induced-by-ovalbumin
#14
Vanessa Perosino Cardoso Siqueira, Marina Izadora Silveira Evangelista, Alana Dos Santos, Rodrigo Labat Marcos, Ana Paula Ligeiro-de-Oliveira, Christiane Pavani, Amílcar Sabino Damazo, Adriana Lino-Dos-Santos-Franco
Since asthma is a multifactorial disease where treatment sometimes is not effective, new therapies that improve the respiratory discomfort of patients are of great importance. Phototherapy as Light-emitting diode (LED) has emerged as a treatment that presents good results for diseases that are characterized by inflammation. Thus, our objective was to investigate the effects of LED on lung inflammation, by an evaluation of lung cell infiltration, mucus secretion, oedema, and the production of cytokines. Male Balb/c mice were or not sensitized and challenged with ovalbumin (OVA) and treated or not with LED therapy (1 h and 4 h after each OVA challenge)...
April 18, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28417480/efficient-red-perovskite-light-emitting-diodes-based-on-solution-processed-multiple-quantum-wells
#15
Shuting Zhang, Chang Yi, Nana Wang, Yan Sun, Wei Zou, Yingqiang Wei, Yu Cao, Yanfeng Miao, Renzhi Li, Yao Yin, Ni Zhao, Jianpu Wang, Wei Huang
This paper reports a facile and scalable process to achieve high performance red perovskite light-emitting diodes (LEDs) by introducing inorganic Cs into multiple quantum well (MQW) perovskites. The MQW structure facilitates the formation of cubic CsPbI3 perovskites at low temperature, enabling the Cs-based QWs to provide pure and stable red electroluminescence. The versatile synthesis of MQW perovskites provides freedom to control the crystallinity and morphology of the emission layer. It is demonstrated that the inclusion of chloride can further improve the crystallization and consequently the optical properties of the Cs-based MQW perovskites, inducing a low turn-on voltage of 2...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28414337/development-of-an-incoherent-broad-band-cavity-enhanced-aerosol-extinction-spectrometer-and-its-application-to-measurement-of-aerosol-optical-hygroscopicity
#16
Weixiong Zhao, Xuezhe Xu, Bo Fang, Qilei Zhang, Xiaodong Qian, Shuo Wang, Pan Liu, Weijun Zhang, Zhenzhu Wang, Dong Liu, Yinbo Huang, Dean S Venables, Weidong Chen
We report on the development of a blue light-emitting-diode-based incoherent broad-band cavity-enhanced absorption spectroscopy (IBBCEAS) instrument for the measurement of the aerosol extinction coefficient at λ=461  nm. With an effective absorption path length of 2.8 km, an optimum detection limit of 0.05  Mm<sup>-1</sup> (5×10<sup>-10</sup>  cm<sup>-1</sup>) was achieved with an averaging time of 84 s. The baseline drift of the developed spectrometer was about ±0...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414231/organic-phosphorescence-nanowire-lasers
#17
Zhenyi Yu, Yishi Wu, Lu Xiao, Jianwei Chen, Qing Liao, Jiannian Yao, Hongbing Fu
Organic solid-state lasers (OSSLs) based on singlet fluorescence have merited intensive study as an important class of light sources. Although the use of triplet phosphors has led to 100% internal quantum efficiency in organic light emitting diodes (OLEDs), stumbling blocks in triplet lasing include generally forbidden intersystem crossing (ISC) and low quantum yield of phosphorescence (ΦP). Here, we reported the first triplet-phosphorescence OSSL from nanowire microcavity of a sulfide-substituted difluoroboron compound...
April 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28413809/preclinical-imaging-of-iridocorneal-angle-and-fundus-using-a-modified-integrated-flexible-handheld-probe
#18
Xun Jie Jeesmond Hong, Vengalathunadakal K Shinoj, Vadakke Matham Murukeshan, Mani Baskaran, Tin Aung
A flexible handheld imaging probe consisting of a [Formula: see text] charge-coupled device camera, light-emitting diode light sources, and near-infrared laser source is designed and developed. The imaging probe is designed with specifications to capture the iridocorneal angle images and posterior segment images. Light propagation from the anterior chamber of the eye to the exterior is considered analytically using Snell's law. Imaging of the iridocorneal angle region and fundus is performed on ex vivo porcine samples and subsequently on small laboratory animals, such as the New Zealand white rabbit and nonhuman primate, in vivo...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28411601/kinetic-monte-carlo-simulations-of-gan-homoepitaxy-on-c-and-m-plane-surfaces
#19
Dongwei Xu, Peter Zapol, G Brian Stephenson, Carol Thompson
The surface orientation can have profound effects on the atomic-scale processes of crystal growth and is essential to such technologies as GaN-based light-emitting diodes and high-power electronics. We investigate the dependence of homoepitaxial growth mechanisms on the surface orientation of a hexagonal crystal using kinetic Monte Carlo simulations. To model GaN metal-organic vapor phase epitaxy, in which N species are supplied in excess, only Ga atoms on a hexagonal close-packed (HCP) lattice are considered...
April 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28407459/enhanced-stability-and-tunable-photoluminescence-in-perovskite-cspbx3-zns-quantum-dot-heterostructure
#20
Weiwei Chen, Jiongyue Hao, Wei Hu, Zhigang Zang, Xiaosheng Tang, Liang Fang, Tianchao Niu, Miao Zhou
All-inorganic perovskite CsPbX3 (X = Cl, Br, I) and related materials are promising candidates for potential solar cells, light emitting diodes, and photodetectors. Here, a novel architecture made of CsPbX3 /ZnS quantum dot heterodimers synthesized via a facile solution-phase process is reported. Microscopic measurements show that CsPbX3 /ZnS heterodimer has high crystalline quality with enhanced chemical stability, as also evidenced by systematic density functional theory based first-principles calculations...
April 13, 2017: Small
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