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413 Newest Publications about the topic leds


Luminescence Properties and Energy Transfer of Eu/Mn-Coactivated Mg2Al4Si5O18 as a Potential Phosphor for White-Light LEDs

17-10-2014 | Jian Chen; Yangai Liu; Minghao Fang; Zhaohui Huang, Inorganic Chemistry, 2014

A series of blue-to-white emitting Mg2Al4Si5O18: Eu2+, Mn2+ phosphors were synthesized via high-temperature solid-state method, and their luminescence properties were investigated in detail. Under near-ultraviolet (UV) light excitation of 365 nm, Eu2+-doped Mg2Al4Si5O18 exhibits a broad blue ...


Electroluminescence of germanium LEDs on silicon: Influence of antimony doping

10-10-2014 | Bernhard Schwartz, André Klossek, Martin Kittler, Michael Oehme, Erich Kasper, Jörg Schulze, physica status solidi (c), 2014

Abstract Antimony‐doped Ge‐LEDs were subjected to electroluminescence studies at temperatures about 300 K and 80 K. The LEDs were grown on Si substrates by MBE. The thickness of the active layer was 300 nm. For the p+nn+‐LEDs the Sb concentrations were 1 × 1018, 1 × 1019, 3 × 1019, 4 × 1019, 7 ...


Application of Visible Light Photocatalysis with Particle Lithography To Generate Polynitrophenylene Nanostructures

06-10-2014 | Susan D. Verberne-Sutton; Rashanique D. Quarels; Xianglin Zhai; Jayne C. Garno; Justin R. Ragains, Journal of the American Chemical Society, 2014

Visible light photoredox catalysis was combined with immersion particle lithography to prepare polynitrophenylene organic films on Au(111) surfaces, forming a periodic arrangement of nanopores. Surfaces masked with mesospheres were immersed in solutions of p-nitrobenzenediazonium ...


Axial Diffusion Barriers in Near-Infrared Nanopillar LEDs

03-10-2014 | Adam C. Scofield; Andrew Lin; Michael Haddad; Diana L. Huffaker, Nano Letters, 2014

The growth of GaAs/GaAsP axial heterostructures is demonstrated and implemented as diffusion current barriers in nanopillar light-emitting diodes at near-infrared wavelengths. The nanopillar light-emitting diodes utilize an n-GaAs/i-InGaAs/p-GaAs axial heterostructure for current injection. Axial ...


ChemInform Abstract: A Single‐Phase Emission‐Tunable Ca5(PO4)3F:Eu2+,Mn2+ Phosphor with Efficient Energy Transfer for White LEDs.

11-09-2014 | Wanjun Tang, Fen Zhang, ChemInform, 2014

Abstract The title phosphor with different concentrations of dopants is prepared by a combustion‐assisted method using Eu2O3, MnCO3, Ca(NO3)2, NH4F, and NH4H2PO4 as starting materials, and CO(NH2)2 as the fuel (flowing 5%H2/N2, porcelain boat, 900 °C, 3 h).


Self‐Assembly: A First Implementation of an Automated Reel‐to‐Reel Fluidic Self‐Assembly Machine (Adv. Mater. 34/2014)

06-09-2014 | Se‐Chul Park, Jun Fang, Shantonu Biswas, Mahsa Mozafari, Thomas Stauden, Heiko O. Jacobs, Advanced Materials, 2014

On page 5942, H. O. Jacobs and co‐workers develop an automated reel‐to‐reel assembly machine to assemble semiconductor dies on flexible substrates. The process is inspired by nature and uses a concept of directed self‐assembly instead of conventional robotic pick‐andplace. The machine is ...


Synthesis and Properties of Fluorenyl‐Pyridinyl Alternating Copolymers for Light‐Emitting Diodes

12-09-2013 | Xiaoyong Pan, Shouping Liu, Hong Yan, Polymer International, 2013

Abstract A novel series of well‐defined alternating poly[2,7‐(9,9‐di(2‐ethylhexyl)fluorenyl)‐alt‐pyridinyl] (PDEHFP) were synthesized using palladium (0) catalyzed Suzuki coupling reaction in high yields. These polymers were characterized by 1H‐NMR, gel permeation chromatography, thermal ...


Sensors, Vol. 13, Pages 12266-12276: Visible Light Communication System Using an Organic Bulk Heterojunction Photodetector

12-09-2013 | Arredondo, Belén ; Romero, Beatriz ; Pena, José Manuel Sánchez; Fernández-Pacheco, Agustín ; Alonso, Eduardo ; Verga ..., Sensors, 2013

A visible light communication (VLC) system using an organic bulk heterojunction photodetector (OPD) is presented. The system has been successfully proven indoors with an audio signal. The emitter consists of three commercial high-power white LEDs connected in parallel. The receiver is based on an ...


A Novel Narrow-Line Red Emitting Na2Y2B2O7:Ce3+,Tb3+,Eu3+ Phosphor with High Efficiency Activated by Terbium Chain for Near-UV White LEDs

11-09-2013 | Dawei Wen; Jianxin Shi, Dalton Transactions, 2013

The application of white LEDs is hindered by the low efficiency of commercial red phosphors. Here, a novel narrow-line red phosphor is produced by terbium chain in the form of Ce3+-(Tb3+)n-Eu3+ in Na2Y2B2O7 host and is characterized with X-ray diffraction, photoluminescence (PL), PL excitation ...


High refractive index thermally stable phenoxyphenyl and phenylthiophenyl silicones for light‐emitting diode applications

05-09-2013 | David W. Mosley, Garo Khanarian, David M. Conner, David L. Thorsen, Tianlan Zhang, Marty Wills, Journal of Applied Polymer Science, 2013

ABSTRACT Creating high refractive index (RI) thermally stable polymers for encapsulating high‐brightness light‐emitting diodes (LEDs) remains a challenge and is an opportunity for improving LED efficiencies. The best previously reported RI for a 200°C heat stable encapsulant for LEDs is 1.56. ...


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