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https://www.readbyqxmd.com/read/27936319/a-unique-blend-of-2-fluorenyl-2-anthracene-and-2-anthryl-2-anthracence-showing-white-emission-and-high-charge-mobility
#1
Mengyun Chen, Yang Zhao, Lijia Yan, Shuai Yang, Yanan Zhu, Imran Murtaza, Gufeng He, Hong Meng, Wei Huang
White-light-emitting materials with high mobility are necessary for organic white-light-emitting transistors, which can be used for self-driven OLED displays or OLED lighting. In this study, we combined two materials with similar structures-2-fluorenyl-2-anthracene (FlAnt) with blue emission and 2-anthryl-2-anthracence (2A) with greenish-yellow emission-to fabricate OLED devices, which showed unusual solid-state white-light emission with the CIE coordinates (0.33, 0.34) at 10 V. The similar crystal structures ensured that the OTFTs based on mixed FlAnt and 2A showed high mobility of 1...
December 9, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27934926/ultrahigh-speed-si-integrated-on-chip-laser-with-tailored-dynamic-characteristics
#2
Gyeong Cheol Park, Weiqi Xue, Molly Piels, Darko Zibar, Jesper Mørk, Elizaveta Semenova, Il-Sug Chung
For on-chip interconnects, an ideal light source should have an ultralow energy consumption per bandwidth (operating en-ergy) as well as sufficient output power for error-free detection. Nanocavity lasers have been considered the most ideal for smaller operating energy. However, they have a challenge in obtaining a sufficient output power. Here, as an alternative, we propose an ultrahigh-speed microcavity laser structure, based on a vertical cavity with a high-contrast grating (HCG) mirror for transverse magnetic (TM) polarisation...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928240/color-stability-of-nanofilled-and-microhybrid-resin-based-composites-following-exposure-to-chlorhexidine-mouthrinses-an-in-vitro-study
#3
Mahmood Khosravi, Behnaz Esmaeili, Forough Nikzad, Soraya Khafri
OBJECTIVES: This study aimed to evaluate the effects of chlorhexidine mouthrinses on color stability of nanofilled and micro-hybrid resin-based composites. MATERIALS AND METHODS: In this in-vitro study, 160 disc-shaped specimens (7x2mm) were fabricated of Filtek Z250 and Filtek Z350XT Enamel (A2 shade). The samples of each group were randomly divided into eight subgroups (n=10). The specimens were incubated in artificial saliva at 37°C for 24 hours. The baseline color values (L*, a*, b*) of each specimen were measured according to CIE LAB system using a reflection spectrophotometer...
March 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27928237/effect-of-accelerated-artificial-aging-on-translucency-of-methacrylate-and-silorane-based-composite-resins
#4
Mehdi Shirinzad, Loghman Rezaei-Soufi, Maryam Sadat Mirtorabi, Farshid Vahdatinia
OBJECTIVES: Composite restorations must have tooth-like optical properties namely color and translucency and maintain them for a long time. This study aimed to compare the effect of accelerated artificial aging (AAA) on the translucency of three methacrylate-based composites (Filtek Z250, Filtek Z250XT and Filtek Z350XT) and one silorane-based composite resin (Filtek P90). MATERIALS AND METHODS: For this in vitro study, 56 composite discs were fabricated (n=14 for each group)...
March 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27925418/white-light-emitting-carbon-dots-prepared-by-the-electrochemical-exfoliation-of-graphite
#5
Aji A Anappara, Julin Joseph
Here we report single-step synthesis of white-light emitting carbon dots (CDs) through a green, facile and cheap electrochemical route using graphite rods as the carbon source. Under UV-excitation, the aqueous dispersion of as-synthesized CDs exhibited broad-band emission which covers a significant fraction of visible spectrum; owing to the heterogeneity in the particle-size and surface-functional groups. The CDs were further explored for their potential as UV-to-visible color-convertor under remote-phosphor technology by capping a 365 nm UV-LED chip with CDs-loaded PMMA to obtain color parameters: CIE (0...
December 7, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27922642/threshold-values-for-the-perception-of-color-changes-in-human-teeth
#6
Daniel S Thoma, Alexis Ioannidis, Vincent Fehmer, Gioia Michelotti, Ronald E Jung, Irena Sailer
The aim of the present study was to assess the threshold values for color changes on the level of the tooth separately for laypeople, dentists, and dental technicians. Standardized presentations were made of five cases (maxilla, left to right lateral incisors) with the gingiva and teeth separated. The color parameters L (lightness), a, and b (chroma) (CIE L*a*b* parameters) of the tooth layers were adjusted to induce darker and lighter colors. In the presentations, the left part of the pictures (maxillary right central and lateral incisors) was unchanged, whereas the right part was modified...
November 2016: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/27922466/smartphone-based-electrocardiographic-and-cardiac-implantable-electronic-device-monitoring
#7
Suneet Mittal
The field of arrhythmia monitoring is changing rapidly. The rapid advent of technology in combination with marked improvements in cellular communication and an increased desire by patients to be actively engaged in their care has ushered in a new era of clinical care. Today, physicians need to think about their patients outside the traditional in-office setting. Two technologies that embody this changing landscape are smartphone-based electrocardiographic (ECG) monitors and remote monitoring of cardiac implantable electronic devices (CIEDs)...
January 2017: Cardiology in Review
https://www.readbyqxmd.com/read/27917587/preparation-of-balanced-trichromatic-white-phosphors-for-solid-state-white-lighting
#8
Sara Al-Waisawy, Anthony F George, Wojciech M Jadwisienczak, Faiz Rahman
High quality white light-emitting diodes (LEDs) employ multi-component phosphor mixtures to generate light of a high color rendering index (CRI). The number of distinct components in a typical phosphor mix usually ranges from two to four. Here we describe a systematic experimental technique for starting with phosphors of known chromatic properties and arriving at their respective proportions for creating a blended phosphor to produce light of the desired chromaticity. This method is applicable to both LED pumped and laser diode (LD) pumped white light sources...
December 5, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27911481/photoluminescence-and-thermoluminescence-of-k2-mg-so4-2-eu-and-evaluation-of-its-kinetic-parameters
#9
Archana Deshpande, N S Dhoble, S C Gedam, S J Dhoble
The K2 Mg(SO4 )2 :Eu phosphor, synthesized by a solid-state diffusion method, was studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The X-ray diffraction (XRD) pattern of the material was matched with the standard JCPDF No. 36-1499. For PL characteristics, K2 Mg(SO4 )2 :Eu(2)(+) showed an emission peak at 474 nm when excited at 340 nm, while it showed Eu(3)(+) emission at 580 nm, and 594 nm splitting at 613 nm and 618 nm for an excitation of 396 nm wavelength due to radiative transitions from (5) D0 to (7) Fj (j = 0, 1, 2, 3)...
December 2, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27911375/fabrication-of-white-light-emitting-electrochemical-cells-with-stable-emission-from-exciplexes
#10
Soichi Uchida, Daisuke Takizawa, Satoru Ikeda, Hironori Takeuchi, Suzushi Nishimura, Hiroyuki Nishide, Yoshinori Nishikitani
The authors present an approach for fabricating stable white light emission from polymer light-emitting electrochemical cells (PLECs) having an active layer which consists of blue-fluorescent poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD) and π-conjugated triphenylamine molecules. This white light emission originates from exciplexes formed between PFD and amines in electronically excited states. A device containing PFD, 4,4',4''-tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA), Poly(ethylene oxide) and K2CF3SO3 showed white light emission with Commission internationale de l'éclairage (CIE) coordinates of (0...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27906378/cool-white-light-emitting-three-stack-oled-structures-for-amoled-display-applications
#11
Ramon Springer, Byoung Yeop Kang, Raju Lampande, Dae Hyun Ahn, Simone Lenk, Sebastian Reineke, Jang Hyuk Kwon
This paper demonstrates 2-stack and 3-stack white organic light-emitting diodes (WOLEDs) with fluorescent blue and phosphorescent yellow emissive units. The 2-stack and 3-stack WOLED comprises blue-yellow and blue-blue-yellow (blue-yellow-blue) combinations. The position of the yellow emitter and possible cavity lengths in different stack architectures are theoretically and experimentally investigated to reach Commission Internationale de L'Eclairage (CIE) coordinates of near (0.333/0.333). Here, a maximum external quantum efficiency (EQE) of 23...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906256/method-to-determine-the-degrees-of-consistency-in-experimental-datasets-of-perceptual-color-differences
#12
Samuel Morillas, Luis Gómez-Robledo, Rafael Huertas, Manuel Melgosa
We propose a fuzzy method to analyze datasets of perceptual color differences with two main objectives: to detect inconsistencies between couples of color pairs and to assign a degree of consistency to each color pair in a dataset. This method can be thought as the outcome of a previous one developed for a similar purpose [J. Mod. Opt.56, 1447 (2009)JMOPEW0950-034010.1080/09500340902944038], whose performance is compared with the proposed one. In this work, we present the results achieved using the dataset employed to develop the current CIE/ISO color-difference formula, CIEDE2000, but the method could be applied to any dataset...
December 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/27905194/constructing-a-novel-dendron-for-the-self-host-blue-emitter-with-tadf-feature-solution-processed-nondoped-oleds-with-bipolar-charge-transfer-and-stable-color-purity
#13
Xinxin Ban, Baoping Lin, Wei Jiang, Yueming Sun
The self-host thermally activated delayed fluorescence materials have recently been identified as the effective emitters for solution-processed nondoped OLEDs. However, except for carbazole unit, few novel dendrons were developed to build the self-host TADF emitters. This study reports two self-host blue materials, tbCz-SO and poCz-SO, with the same TADF emissive core and different dendrons. The influence of the peripheral dendrons on the photophysical properties and electroluminescent performances of the self-host materials were systematically investigated...
November 30, 2016: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/27900511/non-doped-deep-blue-and-doped-white-electroluminescence-devices-based-on-phenanthroimidazole-derivative
#14
Shuo Chen, Yukun Wu, Shoucheng Hu, Yi Zhao, Daining Fang
A novel deep-blue emitter PhImPOTD based on phenathroimidazole was synthesized, which is incorporated by an electron-donating dibenzothiophene unit and electron-withdrawing phenanthroimidazole and diphenylphosphine oxide moieties. Furthermore, the weak π-π stacking and intermolecular aggregation render the photoluminescence quantum yield is as high as 0.34 in the solid state. Non-doped organic light emitting diodes (OLEDs) based on PhImPOTD emitter exhibits a low turn-on voltage of 3.6 V, a favorable efficiency of 1...
November 29, 2016: Journal of Fluorescence
https://www.readbyqxmd.com/read/27896904/contrast-induced-encephalopathy-following-cardiac-catheterization
#15
Roberto Spina, Neil Simon, Romesh Markus, David Wm Muller, Krishna Kathir
OBJECTIVES: To describe the epidemiology, pathophysiology, clinical presentation, and management of contrast-induced encephalopathy (CIE) following cardiac catheterization. BACKGROUND: CIE is an acute, reversible neurological disturbance directly attributable to the intra-arterial administration of iodinated contrast medium. METHODS: The PubMed database was searched and all cases in the literature were retrieved and reviewed. RESULTS: 52 reports of CIE following cardiac catheterization were found...
November 29, 2016: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/27894806/genetic-divergence-in-the-transcriptional-engram-of-chronic-alcohol-abuse-a-laser-capture-rna-seq-study-of-the-mouse-mesocorticolimbic-system
#16
Megan K Mulligan, Khyobeni Mozhui, Ashutosh K Pandey, Maren L Smith, Suzhen Gong, Jesse Ingels, Michael F Miles, Marcelo F Lopez, Lu Lu, Robert W Williams
Genetic factors that influence the transition from initial drinking to dependence remain enigmatic. Recent studies have leveraged chronic intermittent ethanol (CIE) paradigms to measure changes in brain gene expression in a single strain at 0, 8, 72 h, and even 7 days following CIE. We extend these findings using LCM RNA-seq to profile expression in 11 brain regions in two inbred strains - C57BL/6J (B6) and DBA/2J (D2) - 72 h following multiple cycles of ethanol self-administration and CIE. Linear models identified differential expression based on treatment, region, strain, or interactions with treatment...
October 15, 2016: Alcohol
https://www.readbyqxmd.com/read/27886319/white-polymer-light-emitting-diodes-based-on-pvk-the-effect-of-the-electron-injection-barrier-on-transport-properties-electroluminescence-and-controlling-the-electroplex-formation
#17
Dipjyoti Das, Peddaboodi Gopikrishna, Rahul Narasimhan, Ashish Singh, Anamika Dey, Parameswar Krishnan Iyer
The effects of the electron injection barrier on the charge transport, brightness and the electroluminescence (EL) properties of polymer light emitting diodes (PLEDs) with poly(9-vinylcarbazole) (PVK) as an emissive layer have been studied. By using Al and LiF/Al as the cathode in single layer PLEDs and diverse electron transporting layers (ETLs) such as 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (BPhen) and 2,2',2''-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) in the case of multilayer PLEDs, the charge transport, brightness, color tuning and the EL properties of the devices were drastically modified...
November 25, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27884493/initial-genetic-dissection-of-serum-neuroactive-steroids-following-chronic-intermittent-ethanol-across-bxd-mouse-strains
#18
Patrizia Porcu, Todd K O'Buckley, Marcelo F Lopez, Howard C Becker, Michael F Miles, Robert W Williams, A Leslie Morrow
Neuroactive steroids modulate alcohol's impact on brain function and behavior. Ethanol exposure alters neuroactive steroid levels in rats, humans, and some mouse strains. We conducted an exploratory analysis of the neuroactive steroids (3α,5α)-3-hydroxypregnan-20-one (3α,5α-THP), (3α,5α)-3,21-dihydroxypregnan-20-one (3α,5α-THDOC), and pregnenolone across 126-158 individuals and 19 fully inbred strains belonging to the BXD family, which were subjected to air exposure, or chronic intermittent ethanol (CIE) exposure...
November 10, 2016: Alcohol
https://www.readbyqxmd.com/read/27883957/effect-of-freezing-prior-to-aging-on-myoglobin-redox-forms-and-cie-color-of-beef-from-nellore-and-aberdeen-angus-cattle
#19
Carolina Naves Aroeira, Robledo de Almeida Torres Filho, Paulo Rogério Fontes, Alcinéia de Lemos Souza Ramos, Lúcio Alberto de Miranda Gomide, Márcio Machado Ladeira, Eduardo Mendes Ramos
The objective of this study was to evaluate the effect of freezing prior to wet aging on the color of Nellore and Aberdeen Angus cattle meat. Samples of the Longissimus thoracis muscle were subjected to two treatments: conventional aging (0, 7, 14 and 21days); and freezing (-20°C for 40days) followed by thawing and aging. Freezing promoted (P<0.05) formation of metmyoglobin during aging, especially in Nellore beef. Frozen meats showed (P<0.05) lower lightness (L*) values and higher redness (a*), chroma (C*) and hue angle (h*) values at the first day of storage, deteriorating quickly with aging time...
November 16, 2016: Meat Science
https://www.readbyqxmd.com/read/27876231/paternal-preconception-alcohol-exposure-imparts-intergenerational-alcohol-related-behaviors-to-male-offspring-on-a-pure-c57bl-6j-background
#20
Gregory R Rompala, Andrey Finegersh, Michelle Slater, Gregg E Homanics
While alcohol use disorder (AUD) is a highly heritable condition, the basis of AUD in families with a history of alcoholism is difficult to explain by genetic variation alone. Emerging evidence suggests that parental experience prior to conception can impact inheritance of complex behaviors in offspring via non-genomic (epigenetic) mechanisms. For instance, male C57BL/6J (B6) mice exposed to chronic intermittent vapor ethanol (CIE) prior to mating with Strain 129S1/SvImJ ethanol-naïve females produce male offspring with reduced ethanol drinking preference, increased ethanol sensitivity, and increased BDNF expression in the ventral tegmental area (VTA)...
November 5, 2016: Alcohol
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