Adoption of Light-Emitting Diodes in Common Lighting Applications

Yamada, Mary; Chwastyk, Dan

doi:10.2172/1221117

Cited by 16 publications

(14 citation statements)

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“…Efficacy is expressed in lumens per watt, whereas efficiency is reported in percentages and does not consider the perceived luminosity. For lighting applications, efficacy is a key concept and can be estimated in the blue laser-yellow phosphor system by Equation (1), where WPE is the wall plug efficiency of the laser, [24,25] OE is the optical efficiency, QY is the quantum yield of the phosphor, SS is the Stokes shift of the blue to yellow conversion, [8,26,27] and LER is the luminous efficacy of radiation.…”

Section: Metrics: Efficiency Efficacy and Colormentioning

confidence: 99%

Transmission Geometry Laser Lighting with a Compact Emitter

Reilly

Lheureux

Cozzan

et al. 2020

Physica Status Solidi (a)

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Laser lighting systems can take many form factors for applications, such as spotlighting, general illumination, or decorative lighting. The use of lasers in conjunction with phosphors for white lighting leads to questions about incorporating the various package elements. Some practical considerations of a transmission geometry system implementing a blue laser and a yellow Ce:YAG single crystal phosphor are discussed, with specific focus on color tuning and the optical efficiency of the single crystal. A compact emitter is demonstrated with examples of modifications to increase the system performance and complexity. Moving from a cool white system to a warm white system is done through the addition of a red light such as a red laser or red phosphor. The single crystal phosphor component needs to allow light to be coupled in from the laser and has high extraction efficiency. A wavelength‐selective reflective coating is implemented to address these concerns, which increases the luminous efficacy of the system. Engineering the phosphor element using this concept may allow for single crystal phosphors to be viable options for future laser lighting systems.

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Section: Metrics: Efficiency Efficacy and Colormentioning

confidence: 99%

Transmission Geometry Laser Lighting with a Compact Emitter

Reilly

Lheureux

Cozzan

et al. 2020

Physica Status Solidi (a)

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“…Furthermore, with the introduction of 100 W USB power transfer capabilities, the opportunity for bi-directional power flow through the USB port becomes a real possibility (Intel & DisplayLink, 2016). Within occupied spaces, there has been a rapid adoption of LED lights due to their higher energy efficiency and quick payback period (Yamada and Stober, 2015). To date, most LED bulbs are operated from the AC power network, with their own internal converter.…”

Section: Level-1 Applications (<120 V Dc )mentioning

confidence: 99%

Overview paper on: low voltage direct current (LVDC) distribution system standards

Smith

Wang

Emhemed

et al. 2018

IJPELEC

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Low-voltage direct current (LVDC) systems have recently been recognised as one of the key enabling technologies that can facilitate the connection of more distributed renewables with improved efficiency and enhanced controllability. However, there is still a shortage of mature experience and practical technical solutions that can support the uptake of such systems and increase commercial interest. One of the barriers is the lack of standards necessary to increase industry confidence. Recently, new standard activities at national and international levels have begun to cover specific LVDC applications. However, it is still not clear whether these activities, in addition to existing standards, are sufficient and comprehensive to provide the necessary tools for best practice system design. This paper therefore reviews and evaluates the available LVDC standards within the context of the established AC distribution system to determine where future work is required.

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“…Light emitting diode (LED) development started in the early 1960s with the observation of infrared and red radiation emission, reaching blue wavelengths in the early 1990s [ 1 ] thanks to Akasaki, Amano, and Nakamura (Nobel prize winners, 2014), and is continuing deeper into the ultraviolet (UV). The extended wavelength range and the improved efficiency have allowed LEDs [ 2 ] to become the preferred light sources for many important applications, e.g., light sources in traffic signals [ 3 ], solid-state information and image displays [ 4 ], full-color illumination for back-lighting liquid crystal displays [ 5 ], automotive signaling and tail lights [ 6 ], instrument cluster displays [ 7 ], food production [ 8 ], analytical chemistry [ 9 , 10 ] microfluidics control [ 11 ] and, soon, in metrology as promising new photometric standards [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

LEDs: Sources and Intrinsically Bandwidth-Limited Detectors

Filippo

Taralli

Rajteri

2017

Sensors

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The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination. Nowadays, they have also become attractive candidates as new photometric standards. In recent years, LEDs have started to be applied as wavelength-selective photo-detectors as well. Nevertheless, manufacturers’ datasheets are limited about LEDs used as sources in terms of degradation with operating time (aging) or shifting of the emission spectrum as a function of the forward current. On the contrary, as far as detection is concerned, information about spectral responsivity of LEDs is missing. We investigated, mainly from a radiometric point of view, more than 50 commercial LEDs of a wide variety of wavelength bands, ranging from ultraviolet (UV) to near infrared (NIR). Originally, the final aim was to find which LEDs could better work together as detector-emitter pairs for the creation of self-calibrating ground-viewing LED radiometers; however, the findings that we are sharing here following, have a general validity that could be exploited in several sensing applications.

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Adoption of Light-Emitting Diodes in Common Lighting Applications

Cited by 16 publications

References 0 publications

Transmission Geometry Laser Lighting with a Compact Emitter

Transmission Geometry Laser Lighting with a Compact Emitter

Overview paper on: low voltage direct current (LVDC) distribution system standards

LEDs: Sources and Intrinsically Bandwidth-Limited Detectors

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