Light-emitting diodes
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TLDR
Bergh and P.J.Dean as discussed by the authors proposed a light-emitting diode (LEDD) for light-aware Diodes, which was shown to have promising performance.Abstract:
Light-Emitting Diodes. (Monographs in Electrical and Electronic Engineering.) By A. A. Bergh and P. J. Dean. Pp. viii+591. (Clarendon: Oxford; Oxford University: London, 1976.) £22.read more
Citations
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Journal ArticleDOI
Combining Illumination Dimming Based on Pulse-Width Modulation With Visible-Light Communications Based on Discrete Multitone
TL;DR: It was shown that practical communication is only feasible when the line rate of the dimming modulation is at least twice the frequency assigned to the largest multitone subcarrier frequency, and under this constraint and when using a suitably modified demodulation scheme, dimming does not influence the data transmission.
Journal ArticleDOI
Localization via Visible Light Systems
TL;DR: This paper investigates a cooperative VLP system architecture in which VLC receiver units are able to communicate with each other for the purpose of cooperation, and presents a low-complexity, iterative localization algorithm to demonstrate the benefits of cooperation in VLP systems.
Journal ArticleDOI
Analysis of the Integrated SEPIC-Flyback Converter as a Single-Stage Single-Switch Power-Factor-Correction LED Driver
Behzad Poorali,Ehsan Adib +1 more
TL;DR: A new isolated single-stage single-switch power-factor-correction (S4 PFC) driver for supplying light-emitting diodes (LEDs) without electrolytic capacitor is proposed.
Proceedings ArticleDOI
Junction temperature in light-emitting diodes assessed by different methods
TL;DR: In this paper, a detailed analysis of the temperature dependence of a tri-chromatic white LED source (consisting of three types of LEDs) is performed, which reveals that the chromaticity point shifts towards the blue, the color rendering index (CRI) decreases, and the luminous efficacy decreases as the junction temperature increases.
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Does one hour of bright or short-wavelength filtered tablet screenlight have a meaningful effect on adolescents' pre-bedtime alertness, sleep, and daytime functioning?
Melanie Heath,Cate Sutherland,Kate Bartel,Michael Gradisar,Paul Williamson,Nicole Lovato,Gorica Micic +6 more
TL;DR: This study analysed the pre-sleep alertness, sleep, and morning functioning of 16 healthy adolescents who used a bright tablet screen, dim screen, and a filtered short-wavelength screen for 1 hr before their usual bedtime in a within-subjects protocol, finding minimal clinical significance.
References
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Reliability Engineering and System Safety
TL;DR: In this paper, a polynomial dimensional decomposition (PDD) method for global sensitivity analysis of stochastic systems subject to independent random input following arbitrary probability distributions is presented.
Journal ArticleDOI
Origin of efficiency droop in GaN-based light-emitting diodes
Min-Ho Kim,Martin F. Schubert,Qi Dai,Jong Kyu Kim,E. Fred Schubert,Joachim Piprek,Yongjo Park +6 more
TL;DR: In this paper, the efficiency droop in GaInN∕GaN multiple-quantum well (MQW) light-emitting diodes was investigated and it was shown that the droop is not related to MQW efficiency but rather to the recombination of carriers outside the MqW region.
Journal ArticleDOI
Lasing in direct-bandgap GeSn alloy grown on Si
Stephan Wirths,R. Geiger,R. Geiger,N. von den Driesch,Gregor Mussler,Toma Stoica,Siegfried Mantl,Zoran Ikonic,Martina Luysberg,Stefano Chiussi,J. M. Hartmann,Hans Sigg,Jérôme Faist,Dan Buca,Detlev Grützmacher +14 more
TL;DR: In this paper, a direct bandgap GeSn alloy, grown directly onto Si(001), was used for experimentally demonstrating lasing threshold and linewidth narrowing at low temperatures.
Journal ArticleDOI
Spectroscopic and Device Aspects of Nanocrystal Quantum Dots
Jeffrey M. Pietryga,Young-Shin Park,Young-Shin Park,Jaehoon Lim,Andrew F. Fidler,Wan Ki Bae,Sergio Brovelli,Victor I. Klimov +7 more
TL;DR: Recent advances in nanocrystal research related to applications of QD materials in lasing, light-emitting diodes (LEDs), and solar energy conversion are examined.
Journal ArticleDOI
LED Based Indoor Visible Light Communications: State of the Art
TL;DR: This paper provides a comprehensive survey on VLC with an emphasis on challenges faced in indoor applications over the period 1979-2014.