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407 Newest Publications about the topic leds

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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 ...

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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 ...

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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 ...

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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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Optimized Synthetic Protocols for Preparation of Versatile Plasmonic Platform Based on Silver Nanoparticles with Pentagonal Symmetries

01-09-2013 | Nimer Murshid, Dilyn Keogh, Vladimir Kitaev, Particle & Particle Systems Characterization, 2013

The key findings in the synthesis and transformation of silver nanoparticles with pentagonal symmetries arising from regular multiple twinning are reported, researched in the last 5 years. In a one‐stage photochemical synthesis of silver decahedral (pentagonal bipyramid, J13 solid) nanoparticles ...

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Tunable Blue-Green-Emitting Ba3LaNa(PO4)3F:Eu2+,Tb3+ Phosphor with Energy Transfer for Near-UV White LEDs

30-08-2013 | Mengmeng Jiao; Ning Guo; Wei Lü; Yongchao Jia; Wenzhen Lv; Qi Zhao; Baiqi Shao; Hongpeng You, Inorganic Chemistry, 2013

A series of Eu2+ and Eu2+/Tb3+ activated novel Ba3LaNa(PO4)3F phosphors have been synthesized by traditional solid state reaction. Rietveld structure refinement of the obtained phosphor indicates that the Ba3LaNa(PO4)3F host contains three kinds of Ba sites. The photoluminescence properties ...

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An orange-emitting phosphor via efficient Ce3+–Mn2+ and Eu2+–Mn2+ energy transfer in La9.33(SiO4)6O2 for UV or near-UV LEDs

28-08-2013 | Wei Lü; Yongchao Jia; Wen zhen Lv; Qi Zhao; Hongpeng You, New Journal of Chemistry, 2013

An orange-emitting phosphor via efficient Ce3+–Mn2+ and Eu2+–Mn2+ energy transfer in La9.33(SiO4)6O2 has been developed for solid state UV/near-UV white lighting applications. The luminescence properties and energy transfer from Ce3+ to Mn2+ and Eu2+ to Mn2+ are firstly investigated. The ...

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Temperature and injection current dependent optical and thermal characteristics of InGaN‐based green large‐area light‐emitting diodes

23-08-2013 | Soo Hyun Lee, Hee Kwan Lee, Sungbum Bae, Jongbae Kim, Sung‐Bock Kim, Jae Su Yu, physica status solidi (a), 2013

Optical, spectral, and thermal characteristics of InGaN/GaN multiple quantum well green light‐emitting diodes (LEDs) with a large chip size of 0.8 × 1 mm2, operating at λ ∼ 525 nm, on patterned sapphire substrate (PSS) were studied. The temperature‐dependent optical and spectral properties of ...

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Synthesis of K2SiF6:Mn4+ Phosphor from SiO2 Powders via Redox Reaction in HF/KMnO4 Solution and Their Application in Warm‐White LED

23-08-2013 | Chenxing Liao, Renping Cao, Zhijun Ma, Yang Li, Guoping Dong, Kaniyarakkal N. Sharafudeen, Jianrong Qiu, Journal of the American Ceramic Society, 2013

In this article, we propose a facile method for synthesis of K2SiF6:Mn4+ phosphor and discuss its promising application in warm‐white light emitting diodes (LED). The K2SiF6:Mn4+ was synthesized from SiO2 powders through redox reaction in HF/KMnO4 solution. The optical properties of LEDs ...

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Synthesis of Highly Luminescent Silica-Coated CdSe/CdS Nanorods

23-08-2013 | Francesca Pietra; Relinde J.A. van Dijk - Moes; Xiaoxing Ke; Sara Bals; Gustaaf Van Tendeloo; Celso de Mello Donega; ..., Chemistry of Materials, 2013

CdSe(core)/CdS(shell) nanorods (NRs) have been extensively investigated for their unique optical properties, such as high photoluminescence (PL) quantum efficiency (QE) and polarized light emission. The incorporation of these NRs in silica (SiO2) is of high interest, since this renders them ...

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