The Experts below are selected from a list of 9606 Experts worldwide ranked by ideXlab platform
Wei Huang - One of the best experts on this subject based on the ideXlab platform.
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solution processed single emissive layer white organic light emitting diodes based on fluorene host balanced consideration for Color quality and electroluminescent efficiency
Organic Electronics, 2016Co-Authors: Zhou Zhou, Wei Huang, Min Yang, Qunbo Mei, Yunqi Liu, Liping Liu, Bangcheng Zhai, Zhenhong JiaAbstract:Abstract Cost-effective fabrication of white organic light-emitting diodes (WOLED) is meaningful toward commercial application of environment-friendly solid-state lighting sources. Electroluminescent efficiency and Color quality are two opposite performance characteristics facing solution processed WOLEDs requiring balanced consideration. Herein, a recently synthesized molecule of 4,4’-(9,9’-(1,3-phenylene)bis(9H-fluorene-9,9-diyl))bis(N,N-diphenylaniline) (DTPAFB) is introduced as a host material for solution processed all-phosphor WOLEDs, embracing four well-known molecules which are blue iridium (III) bis(2-(4,6-difluorophenyl)pyridinato-N,C2)(picolinate) (FIrpic), green iridium (III) bis[2-(2-pyridinyl-N)phenyl-C](2,4-pentanedionato-O2,O4) [Ir(ppy)2(acac)], and orange iridium (III) bis(2-phenyl-benzothiazole-C2,N)(acetylacetonate) [Ir(bt)2(acac)] plus a home-made red phosphor of iridium (III) tris(1-(2,6-dimethylphenoxy)-4-(4-chlorophenyl)phthalazine) [Ir(MPCPPZ)3]. Illumination quality white light with high brightness, high efficiency, suitable correlated Color temperature (CCT), high Color-rendering index (CRI), and stable electroluminescent (EL) emission is obtained. A stable white emission with a CRI over 70, Commission Internationale de L'Eclairage (CIE) of (0.37, 0.42), and high EL efficiency of 19.6 lm W−1 at high luminance of 2000 cd m−2 for blue/orange Complementary Color WOLEDs is demonstrated. The optimized red/green/blue three primary Color WOLEDs show improved CRI up to 81, moderate high efficiency of 25.8 cd A−1, 14.4 lm W−1, and EQE of 13.9%. Furthermore, the red/green/blue/orange four primary Color WOLEDs show the optional balance between Color quality and EL efficiency with high CRI of around 81–83 and medium CCT of 3755–3929 K which is warm and soft to human eyes. At an illumination relevant luminance of 1000 cd m−2, the total power efficiency reaches 33.6 lm W−1, and still remains 30.2 lm W−1 at 3000 cd m−2, approaching the efficiency of state-of-the-art fluorescent-tube (40–70 lm W−1), potentially suitable as an environment-friendly solid-state lighting source. This work indicates that developing high performance host materials and highly efficient phosphors and carefully combining them with common phosphors is an effective way toward high performance WOLEDs.
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universal strategy for cheap and Color stable single eml woleds utilizing two Complementary Color nondoped emitters without energy transfer
Advanced Optical Materials, 2014Co-Authors: Chen Liu, Minmin Cai, Shufen Chen, Qi Wei, Yan Qian, Linghai Xie, Zhiqiang Gao, Wei HuangAbstract:Furthermore, because most low-energy emitters absorb visible light from the high-energy emitters, such white-emitting devices are generally warm white in Color. All the operational problems make it a less attractive approach for generating white light. Using a single emitter is an alternative way to develop single-EML WOLEDs.
Krishnapriya Tamma - One of the best experts on this subject based on the ideXlab platform.
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Visual signal evolution along Complementary Color axes in four bird lineages.
Biology open, 2020Co-Authors: Anand Krishnan, Avehi Singh, Krishnapriya TammaAbstract:Avian Color patterns function in varied behavioral contexts, most being produced by only a handful of mechanisms including feather nanostructures and pigments. Within a clade, Colors may not occupy the entire available space, and incorporating Complementary Colors may increase the contrast and efficacy of visual signals. Here, we describe plumage patterns in four ecologically and phylogenetically diverse bird families to test whether they possess Complementary Colors. We present evidence that plumage Colors in each clade cluster along a line in tetrachromatic Color space. Additionally, we present evidence that in three of these clades, this line contains Colors on opposite sides of a line passing through the achromatic point (putatively Complementary Colors, presenting higher chromatic contrast). Finally, interspecific Color variation over at least some regions of the body is not constrained by phylogenetic relatedness. By describing plumage patterns in four diverse lineages, we add to the growing body of literature suggesting that the diversity of bird visual signals is constrained. Further, we tentatively hypothesize that in at least some clades possessing bright Colors, species-specific plumage patterns may evolve by swapping the distributions of a Complementary Color pair. Further research on other bird clades may help confirm whether these patterns are general across bird families.
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visual signal evolution along Complementary Color axes in four bird lineages
bioRxiv, 2019Co-Authors: Anand Krishnan, Avehi Singh, Krishnapriya TammaAbstract:Animal Color patterns function in varied behavioral contexts including recognition, camouflage and even thermoregulation. The diversity of visual signals may be constrained by various factors, for example, dietary factors, and the composition of ambient environmental light (sensory drive). How have high-contrast and diverse signals evolved within these constraints? In four bird lineages, we present evidence that plumage Colors cluster along a line in tetrachromatic Color space. Additionally, we present evidence that this line represents Complementary Colors, which are defined as opposite sides of a line passing through the achromatic point (putatively for higher chromatic contrast). Finally, we present evidence that interspecific Color variation over at least some regions of the body is not constrained by phylogenetic relatedness. Thus, we hypothesize that species-specific plumage patterns within these bird lineages evolve by swapping the distributions of a Complementary Color pair (or dark and light patches in one group, putatively representing an achromatic Complementary axis). The relative role of chromatic and achromatic contrasts in discrimination may depend on the environment that each species inhabits.
Ralph W Pridmore - One of the best experts on this subject based on the ideXlab platform.
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Complementary Colors theory of Color vision physiology Color mixture Color constancy and Color perception
Color Research and Application, 2011Co-Authors: Ralph W PridmoreAbstract:I describe Complementary Colors' physiology and functional roles in Color vision, in a three-stage theory (receptor, opponent Color, and Complementary Color stages). 40 specific roles include the Complementary structuring of: S and L cones, opponent single cells, cardinal directions, hue cycle structure, hue constancy, trichromatic Color mixture, additive/subtractive primaries, two unique hues, Color mixture space, uniform hue difference, lightness-, saturation-, and wavelength/hue-discrimination, spectral sensitivity, chromatic adaptation, metamerism, chromatic induction, Helson-Judd effect, Colored shadows, Color rendering, warm-cool Colors, brilliance, Color harmony, Aristotle's flight of Colors, white-black responsivity, Helmholtz-Kohlrausch effect, rainbows/halos/glories, dichromatism, spectral-sharpening, and trimodality of functions (RGB peaks, CMY troughs whose complementarism adapts functions to illuminant). The 40 specific roles fall into 3 general roles: Color mixture, Color constancy, and Color perception. Complementarism evidently structures much of the visual process. Its physiology is evident in complementarism of cones, and opponent single cells in retina, LGN, and cortex. Genetics show our first cones were S and L, which are Complementary in daylight D65, giving a standard white to aid chromatic adaptation. M cone later split from L to oppose the nonspectral (red and purple) hues mixed from S+L. Response curves and wavelength peaks of cones L, S, and (S+L), M, closely resemble, and lead to, those of opponent-Color chromatic responses y, b, and r, g, a bimodal system whose summation gives spectral-sharpened trimodal complementarism (RGB peaks, CMY troughs). Spectral sharpening demands a post-receptoral, post-opponent-Colors location, hence a third stage. © 2011 Wiley Periodicals, Inc. Col Res Appl, 2011
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chromatic induction opponent Color or Complementary Color process
Color Research and Application, 2008Co-Authors: Ralph W PridmoreAbstract:In present convention, chromatic induction (simultaneous and successive contrast) is usually held to be an opponent Color process. Fifty years ago, it was an accepted Complementary Color process. The latter was never disputed yet apparently overlooked, and is here shown to be the more accurate account by inspecting afterimages and published data on simultaneous and successive hue induction. © 2007 Wiley Periodicals, Inc. Col Res Appl, 33, 77–81, 2008
Anand Krishnan - One of the best experts on this subject based on the ideXlab platform.
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Visual signal evolution along Complementary Color axes in four bird lineages.
Biology open, 2020Co-Authors: Anand Krishnan, Avehi Singh, Krishnapriya TammaAbstract:Avian Color patterns function in varied behavioral contexts, most being produced by only a handful of mechanisms including feather nanostructures and pigments. Within a clade, Colors may not occupy the entire available space, and incorporating Complementary Colors may increase the contrast and efficacy of visual signals. Here, we describe plumage patterns in four ecologically and phylogenetically diverse bird families to test whether they possess Complementary Colors. We present evidence that plumage Colors in each clade cluster along a line in tetrachromatic Color space. Additionally, we present evidence that in three of these clades, this line contains Colors on opposite sides of a line passing through the achromatic point (putatively Complementary Colors, presenting higher chromatic contrast). Finally, interspecific Color variation over at least some regions of the body is not constrained by phylogenetic relatedness. By describing plumage patterns in four diverse lineages, we add to the growing body of literature suggesting that the diversity of bird visual signals is constrained. Further, we tentatively hypothesize that in at least some clades possessing bright Colors, species-specific plumage patterns may evolve by swapping the distributions of a Complementary Color pair. Further research on other bird clades may help confirm whether these patterns are general across bird families.
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visual signal evolution along Complementary Color axes in four bird lineages
bioRxiv, 2019Co-Authors: Anand Krishnan, Avehi Singh, Krishnapriya TammaAbstract:Animal Color patterns function in varied behavioral contexts including recognition, camouflage and even thermoregulation. The diversity of visual signals may be constrained by various factors, for example, dietary factors, and the composition of ambient environmental light (sensory drive). How have high-contrast and diverse signals evolved within these constraints? In four bird lineages, we present evidence that plumage Colors cluster along a line in tetrachromatic Color space. Additionally, we present evidence that this line represents Complementary Colors, which are defined as opposite sides of a line passing through the achromatic point (putatively for higher chromatic contrast). Finally, we present evidence that interspecific Color variation over at least some regions of the body is not constrained by phylogenetic relatedness. Thus, we hypothesize that species-specific plumage patterns within these bird lineages evolve by swapping the distributions of a Complementary Color pair (or dark and light patches in one group, putatively representing an achromatic Complementary axis). The relative role of chromatic and achromatic contrasts in discrimination may depend on the environment that each species inhabits.
Ruizhe Jiang - One of the best experts on this subject based on the ideXlab platform.
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a machine learning based visible light communication model leveraging Complementary Color channel
2020Co-Authors: Ruizhe JiangAbstract:Recently witnessed a great popularity of unobtrusive Visible Light Communication (VLC) using screen-camera channels. They overcomes the inherent drawbacks of traditional approaches based on coded images like bar codes. One popular unobtrusive method is the utilizing of alpha channel or Color channels to encode bits into the pixel translucency or Color intensity changes with over-the-shelf smart devices. Specifically, Uber-in-light proves to be an successful model encoding data into the Color intensity changes that only requires over-the-shelf devices. However, Uber-in-light only exploit Multi Frequency Shift Keying (MFSK), which limits the overall throughput of the system since each data segment is only 3-digit long. Motivated by some previous works like Inframe++ or Uber-in-light, in this thesis, we proposes a new VLC model encoding data into Color intensity changes on red and blue channels of video frames. Multi-Phase-Shift-Keying (MPSK) along with MFSK are used to match 4-digit and 5-digit long data segments to specific transmission frequencies and phases. To ensure the transmission accuracy, a modified correlation-based demodulation method and two learning-based methods using SVM and Random Forest are also developed.