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644 Newest Publications about the topic leds

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Recent developments in the new inorganic solid-state LED phosphors

21-Jun-2016 | Zhiguo Xia; Zihan Xu; Mingyue Chen; Quanlin Liu, Dalton Transactions, 2016

Stable and efficient phosphor systems for white light-emitting diodes (LEDs) are highly important with respect to their application in solid-state lighting beyond the technical limitations of traditional lighting technologies. Therefore, inorganic solid-state conversion phosphors must be ...

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Investigation of the effect of UV-LED exposure conditions on the production of vitamin D in pig skin

18-Jun-2016 | Author(s): Line Lundbæk Barnkob, Aikaterini Argyraki, Paul Michael Petersen, Jette Jakobsen, Food Chemistry, 2016

Publication date: 1 December 2016 Source:Food Chemistry, Volume 212 Author(s): Line Lundbæk Barnkob, Aikaterini Argyraki, Paul Michael Petersen, Jette Jakobsen The dietary intake of vitamin D is currently below the recommended intake of 10–20μg vitamin D/day. Foods with increased ...

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Flexible passive tag based on light energy harvesting for gas threshold determination in sealed environments

18-Jun-2016 | Author(s): P. Escobedo, I.M. Pérez de Vargas-Sansalvador, M. Carvajal, L.F. Capitán-Vallvey, A.J. Palma, A ..., Sensors and Actuators B: Chemical, 2016

Publication date: 29 November 2016 Source:Sensors and Actuators B: Chemical, Volume 236 Author(s): P. Escobedo, I.M. Pérez de Vargas-Sansalvador, M. Carvajal, L.F. Capitán-Vallvey, A.J. Palma, A. Martínez-Olmos In this work we describe a passive screen printed flexible tag for ...

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Patterned Ga2O3 for current blocking and optical scattering in visible light‐emitting diodes

17-Jun-2016 | Seung Hwan Kim, Keon Hwa Lee, Hyun Jung Park, Shahab Shervin, Mojtaba Asadirad, Sung‐Nam Lee, Joon Seop Kwak, Jae‐Hy ..., physica status solidi (a), 2016

Patterned gallium oxide (Ga2O3) using one‐step patterning followed by oxygen plasma treatment on a p‐GaN layer can function as both current‐blocking and optical‐scattering regions for uniform current spreading and improved light‐extraction efficiencies. The results showed that the optical ...

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Preparation of Sr1−xCaxLiAl3N4:Eu2+ Solid Solutions and their Photoluminescence Properties

09-Jun-2016 | Wei‐Wei Hu, Wei‐Wei Ji, Sayed Ali Khan, Lu‐Yuan Hao, Xin Xu, Liang‐Jun Yin, Simeon Agathopoulos, Journal of the American Ceramic Society, 2016

A series of quaternary nitride solid solutions with a general formula of Sr1−xCaxLiAl3N4:0.5%Eu2+ was synthesized by a solid‐state reaction method. The experimental results showed that a proper amount of Ca‐doping can improve the crystallinity and the photoluminescence properties of the produced ...

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Sustainability, Vol. 8, Pages 535: Experience with LEDS and NAMA Low Carbon Strategies: The Case of Georgia

04-Jun-2016 | Mdivani, Kakhaberi ; Hoppe, Thomas, Sustainability, 2016

Low Emission Development Strategies (LEDS) and National Appropriate Mitigation Actions (NAMAs) have the potential to support developing countries in attaining low carbon goals. In spite of the evident potential, there is a need to learn from practice. This paper explores the case of Georgia. The ...

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Broadband Yellowish-Green Emitting Ba4Gd3Na3(PO4)6F2:Eu2+ Phosphor: Structure Refinement, Energy Transfer, and Thermal Stability

01-Jun-2016 | Xiaopeng Fu; Wei Lü; Mengmeng Jiao; Hongpeng You, Inorganic Chemistry, 2016

A series of Ba4Gd3Na3(PO4)6F2:Eu2+ phosphors with a broad emitting band have been synthesized by a traditional solid state reaction. The crystal structural and photoluminescence properties of Ba4Gd3Na3(PO4)6F2:Eu2+ are investigated. The different crystallographic sites of Eu2+ in ...

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Growth and optical properties of (Y1−xGdx)3Al5O12:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

31-May-2016 | Stelian Arjoca; Daisuke Inomata; Yoshitaka Matsushita; Kiyoshi Shimamura, CrystEngComm, 2016

(Y1−xGdx)3Al5O12:Ce ((Y,Gd)3Al5O12:Ce) single crystal phosphors (SCPs) were successfully grown using the Czochralski method. The Gd segregation coefficient was determined. The lattice spacing, absorption and emission properties were systematically investigated as a function of Gd concentration in ...

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Sensors, Vol. 16, Pages 783: VLC-Based Positioning System for an Indoor Environment Using an Image Sensor and an Accelerometer Sensor

28-May-2016 | Huynh, Phat ; Yoo, Myungsik, Sensors, 2016

Recently, it is believed that lighting and communication technologies are being replaced by high power LEDs, which are core parts of the visible light communication (VLC) system. In this paper, by taking advantages of VLC, we propose a novel design for an indoor positioning system using LEDs, an ...

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III‐nitride quantum dots for ultra‐efficient solid‐state lighting

23-May-2016 | Jonathan J. Wierer, Nelson Tansu, Arthur J. Fischer, Jeffrey Y. Tsao, Laser & Photonics Reviews, 2016

Abstract III‐nitride light‐emitting diodes (LEDs) and laser diodes (LDs) are ultimately limited in performance due to parasitic Auger recombination. For LEDs, the consequences are poor efficiencies at high current densities; for LDs, the consequences are high thresholds and limited ...

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