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591 Newest Publications about the topic leds

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Ultra-High-Density Arrays of Defect-Free AlN Nanorods: A “Space-Filling” Approach

25-Jan-2016 | Michele Conroy; Vitaly Z. Zubialevich; Haoning Li; Nikolay Petkov; Sally O’Donoghue; Justin D. Holmes; Peter J. Parbrook, ACS Nano, 2016

Nanostructured semiconductors have a clear potential for improved optoelectronic devices, such as high-efficiency light-emitting diodes (LEDs). However, most arrays of semiconductor nanorods suffer from having relatively low densities (or “fill factors”) and a high degree of nonuniformity, ...

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Efficiency droop suppression of InGaN‐based blue light‐emitting diodes using dip‐shaped quantum wells

21-Jan-2016 | Huimin Lu, Tongjun Yu, Yuebin Tao, Xingbin Li, Zhizhong Chen, Zhijian Yang, Jianping Wang, Guoyi Zhang, physica status solidi (a), 2016

The InGaN‐based blue light‐emitting diodes (LEDs) with dip‐shaped quantum wells (QWs) and conventional QWs were fabricated by MOVPE. The performances of fabricated InGaN‐based LEDs were investigated experimentally and analyzed theoretically. The results reveal that the efficiency droop of ...

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[In Depth] Incandescent lights go green

15-Jan-2016 | Robert F. Service, Science , 2016

Incandescent light bulbs have changed little since Thomas Edison perfected them in 1878. But now, researchers report that they've tripled the efficiency of an incandescent, making it nearly as efficient as a commercial LED. They did so by reworking the light bulb's metal light emitter into a flat ...

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Facile Formation of High-Quality InGaN/GaN Quantum-Disks-in-Nanowires on Bulk-Metal Substrates for High-Power Light Emitters

14-Jan-2016 | Chao Zhao; Tien Khee Ng; Nini Wei; Aditya Prabaswara; Mohd Sharizal Alias; Bilal Janjua; Chao Shen; Boon S. Ooi, Nano Letters, 2016

High-quality nitride materials grown on scalable and low-cost metallic substrates are considerably attractive for high-power light emitters. We demonstrate here, for the first time, the high-power red (705 nm) InGaN/GaN quantum-disks (Qdisks)-in-nanowire light-emitting diodes (LEDs) ...

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Enhancing the Brightness of Cesium Lead Halide Perovskite Nanocrystal Based Green Light-Emitting Devices through the Interface Engineering with Perfluorinated Ionomer

13-Jan-2016 | Xiaoyu Zhang; Hong Lin; He Huang; Claas Reckmeier; Yu Zhang; Wallace C. H. Choy; Andrey L. Rogach, Nano Letters, 2016

High photoluminescence quantum yield, easily tuned emission colors, and high color purity of perovskite nanocrystals make this class of material attractive for light source or display applications. Here, green light-emitting devices (LEDs) were fabricated using inorganic cesium lead halide ...

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Characterization of the internal properties of InGaN/GaN core–shell LEDs (Phys. Status Solidi A 1∕2016)

12-Jan-2016 | Johannes Ledig, Xue Wang, Sönke Fündling, Henning Schuhmann, Michael Seibt, Uwe Jahn, Hergo‐Heinrich Wehmann, Andrea ..., physica status solidi (a), 2016

The front cover shows an SEM image (view field = 9 μm) visualizing the light emitting region of a cleaved InGaN/GaN core‐shell micro‐LED pillar which was selectively grown on a sapphire substrate. The cleaved pillar is contacted by two probe tips (colorized in green) while obtaining the EBIC ...

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Complete orientational access for semipolar GaN devices on sapphire (Phys. Status Solidi B 1/2016)

08-Jan-2016 | Benjamin Leung, Dili Wang, Yu‐Sheng Kuo, Jung Han, physica status solidi (b), 2016

The complete freedom to choose the surface orientation of GaN has been an elusive goal for growth on sapphire substrates. As opposed to bulk GaN substrates, which can be arbitrarily sliced at any orientations, the growth on planar sapphire substrates is constrained to only several discrete ...

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Light‐Emitting Diodes: Light‐Emitting Diodes with Hierarchical and Multifunctional Surface Structures for High Light Extraction and an Antifouling Effect (Small 2/2016)

08-Jan-2016 | Young‐Chul Leem, Jung Su Park, Joon Heon Kim, NoSoung Myoung, Sang‐Youp Yim, Sehee Jeong, Wantae Lim, Sung‐Tae Kim, ..., Small, 2016

Bioinspired hierarchical structures on the surface of vertical light‐emitting diodes (VLEDs) are fabricated by S.‐J. Park and co‐workers based on combining a self‐assembled dip‐coating process and nanopatterning transfer method using thermal release tape. These novel surfaces reduce the total ...

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Fully Printed Halide Perovskite Light-Emitting Diodes with Silver Nanowire Electrodes

31-Dec-2015 | Sri Ganesh R. Bade; Junqiang Li; Xin Shan; Yichuan Ling; Yu Tian; Tristan Dilbeck; Tiglet Besara; Thomas Geske; Hanw ..., ACS Nano, 2015

Printed organometal halide perovskite light-emitting diodes (LEDs) are reported that have indium tin oxide (ITO) or carbon nanotubes (CNTs) as the transparent anode, a printed composite film consisting of methylammonium lead tribromide (Br-Pero) and poly(ethylene oxide) (PEO) as the emissive ...

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Triboelectric Nanogenerator Based on the Internal Motion of Powder with a Package Structure Design

24-Dec-2015 | Daewon Kim; Yura Oh; Byeong-Woon Hwang; Seung-Bae Jeon; Sang-Jae Park; Yang-Kyu Choi, ACS Nano, 2015

Harvesting the ambient mechanical energy that is abundant in the living environment is a green technology which can allow us to obtain an eco-friendly and sustainable form of energy. Here, we report a powder-based triboelectric nanogenerator (P-TENG) using polytetrafluoroethylene powder as a ...

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