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RISS 인기검색어
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- 저자 : Perales-Martinez, I.A. (검색결과 2 건)
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Perales-Martinez, I.A.,Rodriguez-Gonzalez, V.,Lee, S.W.,Obregon, S. Elsevier Sequoia 2015 Journal of photochemistry and photobiology Chemist Vol.299 No.-
The InVO<SUB>4</SUB>/TiO<SUB>2</SUB> heterojunction system has been prepared by means of a practical impregnation method in alcoholic media. The obtained photocatalysts were characterized by several techniques, such as X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS) and electron microscopy (SEM/TEM). Also, nitrogen adsorption-desorption isotherms were employed in order to determine the surface area (BET) and pore-size distribution (BJH) of the samples. We have observed that the addition of InVO<SUB>4</SUB> did not provide changes in the structural and textural properties of TiO<SUB>2</SUB> but substantially improved its photocatalytic properties. The best photocatalytic performance for the degradation of phenol was achieved for TiO<SUB>2</SUB> with 0.5wt.% loading of InVO<SUB>4</SUB>. From these results it can be inferred that the effective separation of the charge carriers produced an improvement in the photocatalytic performances of the InVO<SUB>4</SUB>/TiO<SUB>2</SUB> heterojunction photocatalysts. In the same way, a possible mechanism is discussed in order to explain the enhanced photoactivity under UV-vis irradiation.
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Spectral and Color Characterization of a Quantum Dots Display
Khalil Huraibat,Esther Perales,Eric Kirchner,Ivo van der Lans,Alejandro Ferrero,Joaquin Campos,Francisco Miguel Martinez-Verd 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
Digital simulation by rendering gonio-apparent objects it becomes a necessity due to the huge impact is giving day by day in different industries. However, in a recent publication, the limitations of a conventional LCD display for this goal was shown, since many visual attributes of goniochromatic coatings fall outside the color-gamut of this type of electronic display. Consequently, gamut-mapping algorithms, new extended RGB color spaces and/or multi-primaries displays are necessary to reproduce faithfully the colorimetric properties of these materials. Recently, quantum dots (QD) displays appeared in the market with attractive characteristics. QD are semiconductor nanocrystals that provide lifelike colors in an energy-efficient way. Thus, a wide color gamut is achieved. Therefore, a proper color characterization and calibration of this type of displays is needed. For this study, a spectral and color characterization of a QD display is performed. For this purpose, the spectral radiance of a set of images was displayed on a QD display and measured by a tele-spectroradiometer. As results, a good chromaticity constancy of primaries was obtained after black correction is applied. It was checked that this display satisfies channel additivity and the electro-optical transfer function for the three channels can be modelled as a power function. The GOG model was found to well characterize this display. Color reproduction was evaluated in terms of CIEDE2000. The computed CIELAB values of a set of images differ from their objects’ coordinates by an average value of ΔΕ00 = 1.07. Therefore, we conclude that the accuracy obtained with the GOG model is sufficient to get good performance in 3D rendering. On another hand, the spatial uniformity of the display is checked. The display shows poor spatial uniformity in terms of luminance, while the uniformity considering chromatic values shows much better results.
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