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724 Newest Publications about the topic leds

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Improvement of thermal stability of Ag‐based reflector in GaN‐based flip chip LEDs by electron‐beam irradiation

17-Feb-2017 | Yu Lim Lee, Yu‐Jung Cha, Seung Kyu Oh, Tae Kyoung Kim, In Yeol Hong, Yoon Seok Kim, Joon Seop Kwak, physica status solidi (a), 2017

We proposed the effects of electron‐beam irradiation (EBI) on the Ag reflector for GaN‐based light‐emitting diodes (LEDs). To evaluate the thermal stability of Ag, we carried out a thermal aging test. The Ag with EBI showed a high reflectance of 97.9% at a 450 nm wavelength and higher thermal ...

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Phosphor‐in‐glass thick film formation with low sintering temperature phosphosilicate glass for robust white LED

14-Feb-2017 | Sang Hyun Ahn, Yoon Hee Nam, Karam Han, Won Bin Im, Kuk Young Cho, Woon Jin Chung, Journal of the American Ceramic Society, 2017

Abstract Phosphor‐in‐glass (PiG) thick film was fabricated on a borosilicate glass substrate using a conventional screen printing method and employing phosphosilicate glass to allow low‐temperature sintering. The vehicle content and sintering temperature were optimized to form a thick film ...

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Sol–gel synthesis and luminescence property of Sr4Al2O7:Re3+,R+ (Re = Eu and Dy; R = Li, Na and K) phosphors for white LEDs

10-Feb-2017 | Wentao Zhang, Meng Yu, Siyi Dai, Xianfei Chen, Jianping Long, Luminescence, 2017

Abstract Sr4Al2O7:Eu3+ and Sr4Al2O7:Dy3+ phosphors with alkali metal substitution were prepared using a sol–gel method. The effects of a charge compensator R on the structure and luminescence of Sr4Al2O7:Re3+,R+ (Re=Eu and Dy; R=Li, Na and K) phosphors were investigated in detail. Upon ...

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Sensors, Vol. 17, Pages 347: A Probability-Based Algorithm Using Image Sensors to Track the LED in a Vehicle Visible Light Communication System

10-Feb-2017 | Huynh, Phat ; Do, Trong-Hop ; Yoo, Myungsik, Sensors, 2017

This paper proposes a probability-based algorithm to track the LED in vehicle visible light communication systems using a camera. In this system, the transmitters are the vehicles’ front and rear LED lights. The receivers are high speed cameras that take a series of images of the LEDs. ...

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Materials, Vol. 10, Pages 113: Effects of Nanoscale V-Shaped Pits on GaN-Based Light Emitting Diodes

28-Jan-2017 | Chen, Shuo-Wei ; Li, Heng ; Chang, Chia-Jui ; Lu, Tien-Chang, Materials, 2017

This paper reviews the formation of nanoscale V-shaped pits on GaN-based light emitting diodes (LEDs) grown by the metal organic chemical vapor deposition (MOCVD) system and studies the effect of V-shaped pits on quantum efficiency. Since V-pits could provide potential barriers around threading ...

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Quantum Dots: Highly Efficient Green ZnAgInS/ZnInS/ZnS QDs by a Strong Exothermic Reaction for Down‐Converted Green and Tripackage White LEDs (Adv. Funct. Mater. 4/2017)

24-Jan-2017 | Minji Ko, Hee Chang Yoon, Heeyeon Yoo, Ji Hye Oh, Heesun Yang, Young Rag Do, Advanced Functional Materials, 2017

Highly efficient green‐emitting Zn‐Ag‐In‐S (ZAIS)/Zn‐In‐S (ZIS)/ZnS alloy core/inner‐shell/shell quantum dots (QDs), realized by an exothermically generated ZIS inner shell, are presented by Y. R. Do and co‐workers in article 1602638. A photoluminescence quantum yield of 87% with a peak ...

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[In Depth] Your self-driving car could kill radio astronomy

20-Jan-2017 | Daniel Clery, Science , 2017

Add energy-saving streetlights, self-driving cars, and balloon-borne internet services to the threats facing astronomers needing dark skies free of electromagnetic smog. The rise of all three technologies is posing new challenges to ground-based researchers who use the optical and radio spectrum ...

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Zinc Tetraphenylporphyrin as High Performance Visible Light Photoinitiator of Cationic Photosensitive Resins for LED Projector 3D Printing Applications

20-Jan-2017 | Assi Al Mousawi; Cyril Poriel; Frédéric Dumur; Joumana Toufaily; Tayssir Hamieh; Jean Pierre Fouassier; Jacques Lalevée, Macromolecules, 2017

Zinc tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes ...

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New Phosphino Fulvene‐enolate Ligands in Ruthenium Complexes by Ferrocene Photolysis under Solar Radiation

18-Jan-2017 | M Carmen Carrión, Javier Torres, Felix Angel Jalon, Ana Maria Rodriguez, Afrooz Zirakzadeh, Blanca Rosa Manzano, European Journal of Inorganic Chemistry, 2017

Ruthenium complexes that contain a new type of phosphine ligand have been obtained by means of a photochemical transformation. The process involves the irradiation with visible light (tungsten halogen lamp) of ferrocenyl phosphino‐carbonyl ruthenium derivatives to yield complexes with kappa2‐P,O ...

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An AlGaN Core–Shell Tunnel Junction Nanowire Light-Emitting Diode Operating in the Ultraviolet-C Band

18-Jan-2017 | S. M. Sadaf; S. Zhao; Y. Wu; Y.-H. Ra; X. Liu; S. Vanka; Z. Mi, Nano Letters, 2017

To date, semiconductor light emitting diodes (LEDs) operating in the deep ultraviolet (UV) spectral range exhibit very low efficiency due to the presence of large densities of defects and extremely inefficient p-type conduction of conventional AlGaN quantum well heterostructures. We have ...

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