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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
#1
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/28407376/thermoresponsive-emission-switching-via-lower-critical-solution-temperature-behavior-of-organic-inorganic-perovskite-nanoparticles
#2
Ryosuke Nishikubo, Norimitsu Tohnai, Ichiro Hisaki, Akinori Saeki
Lead halide perovskites have shown much promise for high-performing solar cells due to their inherent electronic nature, and though the color of bright-light emitters based on perovskite nanoparticles can be tuned by halide mixing and/or size control, dynamic switching using external stimuli remains a challenge. This article reports an unprecedented lower critical solution temperature (LCST) for toluene solutions containing methylammonium lead bromide (MAPbBr3 ), oleic acid, alkylamines, and dimethylformamide...
April 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28401912/quantum-dot-light-emitting-diodes-with-nitrogen-doped-carbon-nanodot-hole-transport-and-electronic-energy-transfer-layer
#3
Young Ran Park, Hu Young Jeong, Young Soo Seo, Won Kook Choi, Young Joon Hong
Electroluminescence efficiency is crucial for the application of quantum-dot light-emitting diodes (QD-LEDs) in practical devices. We demonstrate that nitrogen-doped carbon nanodot (N-CD) interlayer improves electrical and luminescent properties of QD-LEDs. The N-CDs were prepared by solution-based bottom up synthesis and were inserted as a hole transport layer (HTL) between other multilayer HTL heterojunction and the red-QD layer. The QD-LEDs with N-CD interlayer represented superior electrical rectification and electroluminescent efficiency than those without the N-CD interlayer...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28401410/a-dual-readout-method-for-biothiols-detection-based-on-the-nset-of-nitrogen-doped-carbon-quantum-dots-au-nanoparticles-system
#4
Xin Fu, Danyu Gu, Shengdong Zhao, Ningtao Zhou, He Zhang
In this paper, a rapid, simple and highly sensitive method with dual-readout (colorimetric and fluorometric) based on the nanometal surface energy transfer (NSET) between nitrogen-doped carbon quantum dots (NCQDs) and gold nanoparticles (AuNPs) for detection of biothiols is described. Highly luminescent NCQDs were prepared via a simple one-step hydrothermal method by applying sucrose and glycine as carbon and nitrogen sources. The results showed the obtained NCQDs had an average particle diameter of 5 nm and highly luminescent...
April 11, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28388867/are-friends-really-the-family-we-choose-local-variations-of-hypothalamus-activity-when-viewing-personally-known-faces
#5
Farah H Wolfe, Christine Deruelle, Thierry Chaminade
Sibling and friend relationships have significant impact on individuals' socio-emotional development. Hypothalamic supraoptic nucleus (SON) and paraventricular nucleus (PVN) synthesize and secrete neuropeptides, including oxytocin, associated with attachment behaviors. Here, using fMRI, we investigate the implication of these two hypothalamic nuclei in the visual processing of personally known faces.  Faces of same-sex sibling, best friend, celebrity, and unknown person appear in the middle of the screen while participants perform a task requiring a button click each time a central white dot turns red...
April 23, 2017: Social Neuroscience
https://www.readbyqxmd.com/read/28383899/one-step-formulation-of-targeted-aggregation-induced-emission-dots-for-image-guided-photodynamic-therapy-of-cholangiocarcinoma
#6
Min Li, Yang Gao, Youyong Yuan, Yuzhe Wu, Zifang Song, Ben Zhong Tang, Bin Liu, Qi Chang Zheng
Photodynamic therapy (PDT) is a palliative technique that can improve median survival with minimal invasion for cholangiocarcinoma (CC) patients. An ideal photosensitizer (PS) is critical to guarantee the efficacy of PDT. However, conventional PSs have some obvious drawbacks, such as lack of specificity and easy aggregation in aqueous media that limit their further application in the clinic. We herein fully take advantage of a red emissive aggregation-induced emission (AIE) PS to fabricate integrin ανβ3 targeted organic AIE dots for image-guided PDT via a simple and straightforward one-step strategy...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28380736/resonance-optical-trapping-of-individual-dye-doped-polystyrene-particles-with-blue-and-red-detuned-lasers
#7
Tetsuhiro Kudo, Hajime Ishihara, Hiroshi Masuhara
We demonstrate resonance optical trapping of individual dye-doped polystyrene particles with blue- and red-detuned lasers whose energy are higher and lower compared to electronic transition of the dye molecules, respectively. Through the measurement on how long individual particles are trapped at the focus, we here show that immobilization time of dye-doped particles becomes longer than that of bare ones. We directly confirm that the immobilization time of dye-doped particles trapped by the blue-detuned laser becomes longer than that by the red-detuned one...
March 6, 2017: Optics Express
https://www.readbyqxmd.com/read/28369851/evaluation-of-clinical-signs-and-early-and-late-trichoscopy-findings-in-traction-alopecia-patients-with-fitzpatrick-skin-type-ii-and-iii-a-single-center-clinical-study
#8
Mualla Polat
BACKGROUND: Traction alopecia refers to (often permanent) hair loss caused by prolonged physical damage. No study has yet described the unique trichoscopic findings of the condition. We describe the trichoscopic findings of traction alopecia and its relationships with the duration of traction. METHODS: We studied 25 patients who were clinically diagnosed with traction alopecia. The patients were divided into two groups in terms of traction duration. Trichoscopy was performed at a minimum of two scalp locations in each patient...
March 30, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28363020/highly-efficient-blue-emitting-cdse-derived-core-shell-gradient-alloy-quantum-dots-with-improved-photoluminescent-quantum-yield-and-enhanced-photostability
#9
Junsang Cho, Yun Ku Jung, Jin-Kyu Lee, Hak-Sung Jung
Highly efficient blue-emitting CdSe-derived core/shell gradient alloy quantum dots (CSGA QDs) with photoluminescence quantum yield (PL QY) of ca. 90% have been synthesized through a facile "one-pot" approach. CdSe nuclei are initially formed as core and gradient alloy shells such as CdSexS1-x/ZnSeyS1-y simultaneously encapsulate the preformed CdSe core in an energy-gradient fashion eventually followed by coating with ZnS shells due to the faster precursor reaction kinetics of Cd and Se compared to analog of Zn and S...
April 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28339185/red-emission-b-n-s-co-doped-carbon-dots-for-colorimetric-and-fluorescent-dual-mode-detection-of-fe-3-ions-in-complex-biological-fluids-and-living-cells
#10
Yinghua Liu, Wenxiu Duan, Wei Song, Juanjuan Liu, Cuiling Ren, Jiang Wu, Dan Liu, Hongli Chen
Colorimetric and fluorescent dual mode detection methods have gained much attention in recent years; however, it is still desirable to develop new colorimetric and fluorescent dual mode nanosensors with more simple preparation procedures, low cost, and excellent biocompatibility. Herein, a colorimetric and fluorescent nanosensor based on B, N, S-co-doped carbon dots (BNS-CDs) was synthesized by one-step hydrothermal treatment of 2,5-diaminobenzenesulfonic acid and 4-aminophenylboronic acid hydrochloride. Using this nanosensor, a highly sensitive assay of Fe(3+) in the range of 0...
April 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28335326/tuning-the-emission-energy-of-chemically-doped-graphene-quantum-dots
#11
Noor-Ul-Ain, Martin O Eriksson, Susann Schmidt, M Asghar, Pin-Cheng Lin, Per Olof Holtz, Mikael Syväjärvi, G Reza Yazdi
Tuning the emission energy of graphene quantum dots (GQDs) and understanding the reason of tunability is essential for the GOD function in optoelectronic devices. Besides material-based challenges, the way to realize chemical doping and band gap tuning also pose a serious challenge. In this study, we tuned the emission energy of GQDs by substitutional doping using chlorine, nitrogen, boron, sodium, and potassium dopants in solution form. Photoluminescence data obtained from (Cl- and N-doped) GQDs and (B-, Na-, and K-doped) GQDs, respectively exhibited red- and blue-shift with respect to the photoluminescence of the undoped GQDs...
November 3, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335292/a-tunable-photoluminescent-composite-of-cellulose-nanofibrils-and-cds-quantum-dots
#12
Qinwen Wang, Aimin Tang, Yuan Liu, Zhiqiang Fang, Shiyu Fu
The preparation of fluorescent nanocomposite materials with tunable emission wavelengths by combining cellulose nanofibrils (CNFs) with inorganic nanoparticles is important for promoting CNFs applications. A CNF/CdS nanocomposite was prepared via in situ compositing at room temperature on oxidized CNFs with CdS quantum dots. By controlling the -COOH/Cd(2+) ratio on the CNF, the feeding time of Na₂S and the ultrasonic maturing time, the size of the CdS quantum dots on the CNF surface could be adjusted so that to obtain the CNF/CdS nanocomposite material with different fluorescent colors...
September 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28319191/overt-orienting-of-spatial-attention-and-corticospinal-excitability-during-action-observation-are-unrelated
#13
Sonia Betti, Umberto Castiello, Silvia Guerra, Luisa Sartori
Observing moving body parts can automatically activate topographically corresponding motor representations in the primary motor cortex (M1), the so-called direct matching. Novel neurophysiological findings from social contexts are nonetheless proving that this process is not automatic as previously thought. The motor system can flexibly shift from imitative to incongruent motor preparation, when requested by a social gesture. In the present study we aim to bring an increase in the literature by assessing whether and how diverting overt spatial attention might affect motor preparation in contexts requiring interactive responses from the onlooker...
2017: PloS One
https://www.readbyqxmd.com/read/28301444/hemodynamic-and-cardiorespiratory-predictors-of-sport-rock-climbing-performance
#14
Simon Fryer, David Giles, Inmaculada Garrido Palomino, Alejandro de la O Puerta, Vanesa España Romero
Rock climbing performance has been suggested to involve a notable contribution from the aerobic metabolism. Previously it has been shown that forearm oxygenation kinetics can be used to distinguish ability groups and predict red-point sport climbing performance. Currently it is not known if forearm oxygenation kinetics, or a sport specific assessment of cardiorespiratory fitness best predicts sport rock climbing performance. The aim of the study was to determine whether forearm oxidative capacity index, maximal de-oxygenation (Δ score) during a treadwall V[Combining Dot Above]O[SUBSCRIPT TWO]peak test, treadwall V[Combining Dot Above]O[SUBSCRIPT TWO]peak, or running V[Combining Dot Above]O[SUBSCRIPT TWO]max best predicts self-reported sport climbing performance...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28296052/solid-confinement-of-quantum-dots-in-zif-8-for-efficient-and-stable-color-conversion-white-leds
#15
Wen Ying, Yiyin Mao, Xiaobing Wang, Yi Guo, Haiping He, Zhizhen Ye, Shuit-Tong Lee, Xinsheng Peng
The powder form and low photoluminescence quantum yield (PLQY) of fluorescent metal-organic frameworks (MOFs) present a serious obstacle to fabricating high-efficiency film-like lighting devices. Here, we present a facile way to produce thin films of CdSex S1-x /ZnS quantum dots (QDs)@ZIF-8 with high PLQY by encapsulating red, green, and blue CdSex S1-x /ZnS QDs in ZIF-8 through a one-pot solid-confinement conversion process. The QDs@ZIF-8 thin film emits warm white light with good color quality and presents good thermal stability and long-term durability...
March 13, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28280914/differentiation-of-pityriasis-rubra-pilaris-from-plaque-psoriasis-by-dermoscopy
#16
N E Abdel-Azim, S A Ismail, E Fathy
Pityriasis rubra pilaris (PRP) and plaque psoriasis (PP) are two distinctive erythemato-squamous skin diseases that often have to be differentiated from each other and from other similar dermatoses. Dermoscopy has been proven to aid the clinical diagnosis of several inflammatory disorders, minimizing the need for skin biopsy. Our aim was to determine the dermoscopic patterns of PRP compared to PP and to assess the significance of certain dermoscopic criteria in the diagnosis of PRP. This case-control study included 11 patients with biopsy proven PRP and 25 patients with biopsy proven plaque psoriasis...
May 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28269531/a-tunable-digital-ishihara-plate-for-pre-school-aged-children
#17
Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone
Colors play a fundamental role for children, both in the everyday life and in education. They recognize the surrounding world, and play games making a large use of colors. They learn letters and numbers by means of colors. As a consequence, early diagnosis of color blindness is an crucial to support an individual affected by this visual perception alteration at the initial phase of his/her life. The diagnosis of red-green color deficiencies (protanopia or deuteranopia) is commonly accomplished by means of the Ishihara test, which consists of plates showing dots with different sizes where some of them compose numbers within a gamut of colors while the ones composing the background have different colors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28264339/two-new-species-of-i-melanorivulus-i-cyprinodontiformes-cynolebiidae-from-rio-verde-drainage-upper-rio-paran%C3%A3-basin-brazil
#18
Matheus Vieira Volcan, Bruno Klotzel, Luis Esteban Krause Lanés
Two new species of the genus Melanorivulus are herein described from the middle Rio Verde drainage, upper Rio Paraná basin, Mato Grosso do Sul, Brazil. Both new species are members of the Melanorivulus pictus clade, diagnosed by having ventral process of angulo-articular vestigial and flanks intense greenish blue or greenish golden to purplish blue above anal fin base in males. Melanorivulus nigropunctatus, new species, from wetlands of a small drainage tributary of right side of the Rio Verde, differs from all other congeners by possessing black dots over the head and body in both sexes and pectoral fin orange with a dark grey margin in males...
February 21, 2017: Zootaxa
https://www.readbyqxmd.com/read/28261690/fluorescent-magnetic-multifunctional-carbon-dots-for-selective-separation-identification-and-eradication-of-drug-resistant-superbugs
#19
Avijit Pramanik, Stacy Jones, Francisco Pedraza, Aruna Vangara, Carrie Sweet, Mariah S Williams, Vikram Ruppa-Kasani, Sean Edward Risher, Dhiraj Sardar, Paresh Chandra Ray
The emergence of drug-resistant superbugs remains a major burden to society. As the mortality rate caused by sepsis due to superbugs is more than 40%, accurate identification of blood infections during the early stage will have a huge significance in the clinical setting. Here, we report the synthesis of red/blue fluorescent carbon dot (CD)-attached magnetic nanoparticle-based multicolor multifunctional CD-based nanosystems, which can be used for selective separation and identification of superbugs from infected blood samples...
February 28, 2017: ACS Omega
https://www.readbyqxmd.com/read/28256780/quantum-dot-light-emitting-diodes-for-large-area-displays-towards-the-dawn-of-commercialization
#20
REVIEW
Xingliang Dai, Yunzhou Deng, Xiaogang Peng, Yizheng Jin
Quantum dots are a unique class of emitters with size-tunable emission wavelengths, saturated emission colors, near-unity luminance efficiency, inherent photo- and thermal- stability and excellent solution processability. Quantum dots have been used as down-converters for back-lighting in liquid-crystal displays to improve color gamut, leading to the booming of quantum-dot televisions in consumer market. In the past few years, efficiency and lifetime of electroluminescence devices based on quantum dots achieved tremendous progress...
March 3, 2017: Advanced Materials
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