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425 Newest Publications about the topic leds

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

11-11-2014 | 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 conventional high temperature solid-state method. X-ray diffraction (XRD), photoluminescence emission and excitation spectra were utilized to characterize as-synthesized samples. Under UV-light pumping, ...

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A benzophenone‐naphthalimide derivative as versatile photoinitiator of polymerization under near UV and visible lights

08-11-2014 | Jing Zhang, Nicolas Zivic, Frédéric Dumur, Pu Xiao, Bernadette Graff, Didier Gigmes, Jean Pierre Fouassier, Jacques ..., Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT A benzophenone‐naphthalimide derivative (BPND) bearing tertiary amine groups has been developed as a high‐performance photoinitiator in combination with 2,4,6‐tris(trichloromethyl)‐1,3,5‐triazine or an iodonium salt for both the free radical polymerization (FRP) of acrylates and the ...

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Photonics dominates Nobel Prizes

01-11-2014 | Nature Photonics, 2014

Nature Photonics 8, 809 (2014). doi:10.1038/nphoton.2014.277 Awards for blue LEDs and super-resolution microscopy announced.

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Optimal ways of colour mixing for high‐quality white‐light LED sources

30-10-2014 | Kirill A. Bulashevich, Alexey V. Kulik, Sergey Yu. Karpov, physica status solidi (a), 2014

Optimization of colour mixing in white‐light sources based on light‐emitting diodes (LEDs) only and those utilizing partial light conversion by a yellow YAG:Ce3+ phosphor is carried out by simulations. The trade‐off between the colour rendering index (CRI) and efficacy of the white‐light ...

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LED‐Induced Polymerization (385, 405, and 455 nm) Using Star‐Shaped Tris(4‐(thiophen‐2‐yl)phenyl)amine Derivatives as Light‐Harvesting Photoinitiators

29-10-2014 | Jing Zhang, Xavier Sallenave, Thanh‐Tuan Bui, Frédéric Dumur, Pu Xiao, Bernadette Graff, Didier Gigmes, Jean Pierre ..., Macromolecular Chemistry and Physics, 2014

Two star‐shaped tris(4‐(thiophen‐2‐yl)phenyl)amine derivatives, namely tris(4‐(5‐(3‐pentylthieno[3,2‐b]thiophen‐5‐yl)thiophen‐2‐yl)phenyl)amine and tris(4‐(5‐(3‐pentyl‐2‐(thiophen‐2‐yl)thieno[3,2‐b]thiophen‐5‐yl)thiophen‐2‐yl)phenyl)amine, are developed as photoinitiators for radical and ...

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A Novel Efficient Mn4+ Activated Ca14Al10Zn6O35 Phosphor: Application in Red-Emitting and White LEDs

28-10-2014 | Wei Lü; Wenzhen Lv; Qi Zhao; Mengmeng Jiao; Baiqi Shao; Hongpeng You, Inorganic Chemistry, 2014

A new, highly efficient deep red-emitting phosphor Ca14Al10Zn6O35:Mn4+ was developed as a component of solid-state white light-emitting diodes (LEDs). The structural and optical characterization of the phosphor is described. The phosphor exhibits strong emission in the range of 650–700 nm when ...

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Systematic study of epitaxy growth uniformity in a specific MOCVD reactor

27-10-2014 | Haisheng Fang, Zhi Zhang, Yaoyu Pan, Ronghui Ma, Sheng Liu, Mengying Wang, Crystal Research and Technology, 2014

Gallium nitride (GaN) is a direct bandgap semiconductor widely used in bright light‐emitting diodes (LEDs). Thin‐film GaN is grown by metal‐organic chemical vapour deposition (MOCVD) technique. Reliability, efficiency and durability of LEDs are influenced critically by the quality of GaN films. ...

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