Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Color rendering index"”.
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Analysis and development of improved convertes for LED drivers with special focus on efficiency and dimming
… fast response, robustness, reliability, and high color rendering index. The only drawback is that LEDs cannot be connected directly to the mains. Thus, it is fundamental to drive the LEDs through a current-controlled power supply. The aim of this driver is not only to drive the LEDs, but also to …
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Light emitting diode color rendition properties
This paper discusses the color rendition capabilities of light emitting diodes (LEDs) and their relationship with the current standard for color rendition quality. The current standard for judging light source color rendering properties, known as the color rendering index (CRI), has come under …
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Electrical excitation of colloidally synthesized quantum dots in metal oxide structures
… such as thin film displays with improved color saturation and white lighting with high color rendering index. This work demonstrates that air-stable metal oxides can be used to achieve QD-LEDs that have long shelf lives and operate at constant luminance in ambient conditions, unpackaged. …
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Physical properties and design of light-emitting devices based on organic materials and nanoparticles
… with patterning methods, allowing multicolor light sources to be fabricated on the same substrate by simply changing the emissive colloidal QD layer. While the fabrication methods for QD-LEDs have been extensively investigated, the basic physical processes governing the performance of …
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Physical properties and design of light-emitting devices based on organic materials and nanoparticles
… with patterning methods, allowing multicolor light sources to be fabricated on the same substrate by simply changing the emissive colloidal QD layer. While the fabrication methods for QD-LEDs have been extensively investigated, the basic physical processes governing the performance of …
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Dynamic solid state lighting
… the mathematics governing sensed illuminance, color, and corresponding control (feedback and adjustment) are formally defined. The prototype adjustable light source is capable of maintaining an average color rendering index greater than 92 (nearly the quality of daylight) across a broad …
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III-nitride nanowire light-emitting diodes: design and characterization
… by molecular beam epitaxy was made. Full-color emission across nearly the entire visible wavelength range was realized by controlling the In composition in the InGaN active region. Strong white-light emission was recorded for the unpackaged nanowire LEDs with an unprecedentedly high color …
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Quantum dot polymer composite materials for light management in optoelectronic devices
… tradition yellow phosphors suffer from low color rendering index due to the broad emission spectrum of the phosphors. QDs have been proposed as better candidate than traditional yellow phosphors due to their narrow and tunable emission spectrum, and wide absorption spectrum in the UV-blue …
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Visible light emission from Eu-containing Si-based materials
… which are (0.33, 0.33), and the calculated color rendering index is 91/100. The second approach discussed in this thesis is based on the synthesis of Eu compounds by thermal processing of Eu2O3 thin films deposited by RF magnetron sputtering on Si substrates. It has been shown that annealing …
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COLOR CHARACTERIZATION: NOVEL ASPECTS IN DISPLAYING, MODELING AND INTERACTION WITH LIGHT
Tema centrale e filo conduttore della tesi è il colore. All'interno di questo tema generale, vengono esplorate delle linee di ricerca in tre ambiti: Riproduzione del colore, Modellizzazione della sensazione di colore e Interazione tra luce e colore. Per quanto riguarda la prima area, la ricerca si …