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432 Newest Publications about the topic leds

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Metal‐Free, Room‐Temperature, Radical Alkoxycarbonylation of Aryldiazonium Salts through Visible‐Light Photoredox Catalysis

10-12-2014 | Wei Guo, Liang‐Qiu Lu, Yue Wang, Ya‐Ni Wang, Jia‐Rong Chen, Wen‐Jing Xiao, Angewandte Chemie International Edition, 2014

Abstract The first radical alkoxycarboxylation of aryldiazonium salts using CO gas through visible‐light‐induced photoredox catalysis (16 W blue LEDs) has been developed. This reaction is entirely metal‐free, is carried out at room temperature with a low loading of an organic dye as a ...

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Epitaxial Growth of Three-Dimensionally Mesostructured Single-Crystalline Cu2O via Templated Electrodeposition

10-12-2014 | Jinwoo Kim; Ha Seong Kim; Jun Hee Choi; Hyeongtag Jeon; Yohan Yoon; Jinyun Liu; Jea-Gun Park; Paul V. Braun, Chemistry of Materials, 2014

Significant efforts have been made over the past few decades to realize functional three-dimensional photonic crystal devices including zero-threshold lasers, waveguides, light-emitting diodes (LEDs), and solar cells; however, progress has been limited because of difficulties in creating ...

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Materials, Vol. 7, Pages 7781-7798: Effect of Temperature on the Growth of Silver Nanoparticles Using Plasmon-Mediated Method under the Irradiation of Green LEDs

05-12-2014 | Lee, Shan-Wei ; Chang, Shi-Hise ; Lai, Yen-Shang ; Lin, Chang-Cheng ; Tsai, Chin-Min ; Lee, Yao-Chang ; Chen, Jui-Ch ..., Materials, 2014

Plasmon-mediated shape conversion of spherical silver nanoparticles (NPs) to nanostructures with other shapes under the irradiation of green LEDs (520 ± 20 nm, 35 mw/cm2) at various temperatures (60, 40, 20, 10, 5, and 0 °C) was performed in this study. It was found that the bath temperature ...

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Materials, Vol. 7, Pages 7828-7842: Combustion Synthesis and Photoluminescence Properties of Red-Emitting CaAlSiN3:Eu2+ Phosphor for White-LEDs

05-12-2014 | Chung, Shyan-Lung ; Huang, Shu-Chi, Materials, 2014

A combustion synthesis method has been developed for synthesis of Eu2+ doped CaAlSiN3 phosphor and its photoluminescence properties were investigated. Ca, Al, Si, and Eu2O3 powders were used as the Ca, Al, Si and Eu sources. The addition of NaN3, NH4Cl and Si3N4 powders was found to increase ...

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A single-phased tunable emission phosphor MgY2Si3O10: Eu3+, Bi3+ with efficient energy transfer for white LEDs

26-11-2014 | Hongpeng Zhou; Ye Jin; Mingsong Jiang; Qingping Wang; Xingxing Jiang, Dalton Transactions, 2014

A novel single-phased tunable emitting phosphor MgY2Si3O10: Bi3+, Eu3+ has been synthesized by a conventional high temperature solid-state method. X-ray diffraction (XRD), photoluminescence emission and excitation spectra were utilized to characterize the as-synthesized samples. Under UV-light ...

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Luminescence Properties and Energy‐Transfer Behavior of a Novel and Color‐Tunable LaMgAl11O19:Tm3+, Dy3+ Phosphor for White Light‐Emitting Diodes

25-11-2014 | Xin Min, Minghao Fang, Zhaohui Huang, Yan'gai Liu, Chao Tang, Xiaowen Wu, Journal of the American Ceramic Society, 2014

Novel LaMgAl11O19:Tm3+, Dy3+ phosphors were prepared utilizing a high‐temperature solid‐state reaction method. The phase formation, luminescence properties, energy‐transfer mechanism from the Tm3+ to the Dy3+ ions, the thermal stability, and CIE coordinates were investigated. When excited at ...

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Stepwise Strategy to Cyclometallated PtII Complexes with N‐Heterocyclic Carbene Ligands: A Luminescence Study on New β‐Diketonate Complexes

20-11-2014 | Sara Fuertes, Hector García, Mariano Perálvarez, Wim Hertog, Josep Carreras, Violeta Sicilia, Chemistry - A European Journal, 2014

Abstract The imidazolium salt 3‐methyl‐1‐(naphthalen‐2‐yl)‐1H‐imidazolium iodide (2) has been treated with silver(I) oxide and [{Pt(μ‐Cl)(η3‐2‐Me‐C3H4)}2] (η3‐2‐Me‐C3H4=η3‐2‐methylallyl) to give the intermediate N‐heterocyclic carbene complex [PtCl(η3‐2‐Me‐C3H4)(H*‐κC*)] (3) ...

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C-dot sensitized Eu3+ luminescence from Eu3+-doped LaF3–C dot nanocomposites

18-11-2014 | Tuhin Samanta; Chanchal Hazra; Venkataramanan Mahalingam, New Journal of Chemistry, 2014

Very strong Eu3+ luminescence is achieved via sensitization by carbon dots (C-dots) in Eu3+-doped LaF3–C-dot nanocomposites for the first time. This energy transfer via C-dots leads to the broadband excitation of Eu3+ ions which can have potential use in phosphor based LEDs.

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Light‐Emitting Diodes: An Organic Down‐Converting Material for White‐Light Emission from Hybrid LEDs (Adv. Mater. 43/2014)

13-11-2014 | Neil J. Findlay, Jochen Bruckbauer, Anto R. Inigo, Benjamin Breig, Sasikumar Arumugam, David J. Wallis, Robert W. Ma ..., Advanced Materials, 2014

Combining a yellow‐emitting organic material with a blue‐emitting inorganic light‐emitting device (LED) provides a hybrid white‐light LED. This approach, demonstrated by R. W. Martin, P. J. Skabara, and co‐workers on page 7290, couples very efficient blue emission with the flexibility, fast ...

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Competition between Charge Transport and Energy Barrier in Injection-Limited Metal/Quantum Dot Nanocrystal Contacts

12-11-2014 | Youngjun Kim; Seongeun Cho; Sunho Jeong; Doo-Hyun Ko; Hyungduk Ko; Namho You; Mincheol Chang; Elsa Reichmanis; Jun-Y ..., Chemistry of Materials, 2014

Injection-limited contacts in many of electronic devices such as light-emitting diodes (LEDs) and field effect transistors (FETs) are not easily avoided. We demonstrate that charge injection in the injection-limited contact is determined by charge transport properties as well as the charge ...

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