Light Emitting Diodes
Mostrando 1-12 de 75 artigos, teses e dissertações.
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1. Desenvolvimento de uma lâmpada LED inteligente para monitoramento de insetos no manejo integrado de pragas
RESUMO Objetivou-se neste estudo apresentar o projeto e os resultados de testes em campo de uma lâmpada de LEDs (light emitting diodes) para aplicação em manejo integrado de pragas (MIP) e outros estudos entomológicos. O espectro de luz dos LEDs foi otimizado para aumentar a atratividade de insetos da lâmpada e reduzir o consumo de energia. Um circuito
Rev. bras. eng. agríc. ambient.. Publicado em: 2021-04
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2. Supramolecular Approach in Energy Conversion Devices
This review summarizes investigations carried out at the Laboratory of Photochemistry and Energy Conversion (LFCE) in the University of São Paulo dealing with design and characterization of ruthenium(II), rhenium(I) and iridium(III) polypyridine complexes with desired photochemical and photophysical properties in light of the development of optoelectronics
J. Braz. Chem. Soc.. Publicado em: 2020-11
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3. In vitro propagation of alpinia cultivars in different light sources
Resumo A fonte de luz na cultura de tecidos muitas vezes é um dos fatores pontuais para a adequação da produção de plantas, para isso, vêm se utilizando os diodos emissores de luz (LEDs) no intuito de aumentar o crescimento e desenvolvimento das plantas propagadas in vitro. O objetivo do trabalho foi avaliar a propagação in vitro de cultivares de Alp
Ornam. Hortic.. Publicado em: 29/04/2019
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4. Electrical and optical numerical modeling of DP-PPV based polymer light emitting diode
Abstract In this paper, an in-depth study of the electrical and optical characteristics of Polymer Light Emitting Diodes ITO/PEDOT: PSS/DP-PPV derivatives/Al(Ca) is presented. Three polymer materials are considered; poly(2,3-diphenyl-5-(4-heptyloxy-4'-oxytrimethylenediphenyl)-phenylenevinylene) (P1), poly(2,3-diphenyl-5-[4-(4-pentylcyclohexyl)phenoxy]-propyl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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5. Improvement of power efficiency of hybrid white OLEDs based on p-i-n structures
ABSTRACT In this article, hybrid white organic light-emitting diodes (WOLEDs) under p-i-n structures have been investigated in terms of power efficiency. By using tris(8-hydroxy quinolinato) aluminum (Alq3) doped with 8-hydroxy-quinolinato lithium (Liq) as an n-type and WHI112 doped with molybdenum trioxide (MoO3) as a p-type, the typical device structure of
Matéria (Rio J.). Publicado em: 05/03/2018
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6. A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors
This paper presents a low-cost reflectometer for selective detection of Cu2+. The reflectometer is based on an emission light source using five light-emitting diodes at different wavelengths and a detector using a webcam. The samples were prepared using a filter paper-based colorimetric sensor with ascorbic acid-based quinoxaline derivative. Video analysis u
J. Braz. Chem. Soc.. Publicado em: 2017-12
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7. A importância do estado excitado 3MLCT de compostos de Ru(II), Re(I) e Ir(III) no desenvolvimento de fotossensores, oleds e fotorredução de CO2
The photochemistry and photophysics of coordination compounds have been extensively investigated not only because their structure, stability, reactivity dependence on the metal center oxidation state and the coordinated ligand; but also for their electronic transitions in a wide range of visible radiation. The knowledge of light absorption, excited state dea
Quím. Nova. Publicado em: 2017-02
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8. Effect of Led Lighting Colors for Laying Japanese Quails
ABSTRACT Time of exposure and light intensity rearing house may affect the performance and egg quality of laying quails. This research aimed at evaluating the live performance, egg quality, biometry of the reproductive system, and the gastrointestinal tract of Japanese quails (Coturnix coturnix japonica) exposed to artificial light-emitting diodes (LED) of d
Rev. Bras. Cienc. Avic.. Publicado em: 2016-09
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9. A system for treatment of diabetic foot ulcers using led irradiation and natural latex
Abstract Introduction: We developed and tested a new system for inducing the healing of diabetic foot ulcers. The system relies on the regenerative properties of its two components: an insole with a sheet of natural latex and a device that contains a matrix of light emitting diodes with wavelength of 635 nm. Methods The electronic and latex based devices
Res. Biomed. Eng.. Publicado em: 05/02/2016
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10. Performance of Broilers Reared under Monochromatic Light Emitting Diode Supplemental Lighting
ABSTRACT The purpose of this study was to evaluate the effect of green monochromatic light emitting diodes (LED) or white fluorescent lamps on the growth performance of broilers reared in open houses. Two hundred broilers (Ross 308) were sexed and divided into four treatments, according to sex and supplemental light source: T1, males under green LED; T2, mal
Rev. Bras. Cienc. Avic.. Publicado em: 2015-12
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11. Evaluation of light-emitting diodes as attractant for sandflies (Diptera: Psychodidae: Phlebotominae) in northeastern Brazil
Hoover Pugedo light traps were modified for use with green and blue-light-emitting diodes to trap phlebotomine sandflies in northeastern Brazil. A total of 2,267 specimens belonging to eight genera and 15 species were sampled. The predominant species were Nyssomyia whitmani(34.41%) and Micropygomyia echinatopharynx(17.25%).The green LED trap prevailed over t
Mem. Inst. Oswaldo Cruz. Publicado em: 2015-09
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12. Study on Needles and Cracks of Tin-doped Indium Oxide Tablets for Electron Beam Evaporation Process
Tin-doped indium oxide (ITO) tablets were used to deposit ITO films on p-GaN layer of light-emitting diodes. Needles and cracks in ITO tablets generated during electron beam evaporation process were deeply investigated. The formation of needles is predominantly resulted from the scanning trace, which is controlled by x and y axes scanning singles. The needle
Mat. Res.. Publicado em: 2015-06