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739 Newest Publications about the topic leds

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Stretchable Light‐Emitting Diodes with Organometal‐Halide‐Perovskite–Polymer Composite Emitters

07-Apr-2017 | Sri Ganesh R. Bade, Xin Shan, Phong Tran Hoang, Junqiang Li, Thomas Geske, Le Cai, Qibing Pei, Chuan Wang, Zhibin Yu, Advanced Materials, 2017

Intrinsically stretchable light‐emitting diodes (LEDs) are demonstrated using organometal‐halide‐perovskite/polymer composite emitters. The polymer matrix serves as a microscale elastic connector for the rigid and brittle perovskite and induces stretchability to the composite emissive layers. ...

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Over 100 cd A−1 Efficient Quantum Dot Light‐Emitting Diodes with Inverted Tandem Structure

31-Mar-2017 | Heng Zhang, Xiaowei Sun, Shuming Chen, Advanced Functional Materials, 2017

Quantum dot light‐emitting diodes (QLEDs) with tandem structure are promising candidates for future displays because of their advantages of pure emission color, long lifetime, high brightness, and high efficiency. To obtain efficient QLEDs, a solution‐processable interconnecting layer (ICL) ...

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Depth dependent strain analysis in GaN‐based light emitting diodes using surface‐plasmon enhanced Raman spectroscopy

31-Mar-2017 | Seung‐Young Lim, Tae‐Soo Kim, Bo‐Gyoung Jang, Soon‐Ku Hong, Jung‐Hoon Song, physica status solidi (a), 2017

GaN‐based LEDs often develop unintended strain, due to the lattice and thermal expansion mismatch between the sapphire substrate and GaN layers. This residual compressive strain in GaN overlayers can cause a number of critical effects, such as wafer bowing, threading dislocation generation that ...

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Molecules, Vol. 22, Pages 564: Self-Organized TiO2–MnO2 Nanotube Arrays for Efficient Photocatalytic Degradation of Toluene

31-Mar-2017 | Nevárez-Martínez, María C.; Kobylański, Marek P.; Mazierski, Paweł ; Wółkiewicz, Jolanta ; Trykowski, Grzegorz ; Mal ..., Molecules, 2017

Vertically oriented, self-organized TiO2–MnO2 nanotube arrays were successfully obtained by one-step anodic oxidation of Ti–Mn alloys in an ethylene glycol-based electrolyte. The as-prepared samples were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy ...

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Improved light output power of GaN‐based ultraviolet light‐emitting diode using a mesh‐type GaN/SiO2/Al omnidirectional reflector

27-Mar-2017 | Jun‐Youn Won, Dae‐Hyun Kim, Daesung Kang, Jun‐Suk Sung, Da‐Som Kim, Sun‐Kyung Kim, Tae‐Yeon Seong, physica status solidi (a), 2017

We investigated the effect of a mesh‐type GaN/SiO2/Al omnidirectional reflector (ODR) on the light output power of AlGaN/InGaN‐based ultraviolet (365 nm) LEDs and compared their performance with that of LEDs with a GaN/ITO/Al reflector. Using the scattering matrix method, the normal incidence ...

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Lanthanide and Heavy Metal Free Long White Persistent Luminescence from Ti Doped Li–Hackmanite: A Versatile, Low‐Cost Material

17-Mar-2017 | Isabella Norrbo, José M. Carvalho, Pekka Laukkanen, Jaakko Mäkelä, Fikret Mamedov, Markus Peurla, Hanna Helminen, Sa ..., Advanced Functional Materials, 2017

Persistent luminescence (PeL) materials are used in everyday glow‐in‐the‐dark applications and they show high potential for, e.g., medical imaging, night‐vision surveillance, and enhancement of solar cells. However, the best performing materials contain rare earths and/or other heavy metal and ...

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IJMS, Vol. 18, Pages 641: Effects of Light-Emitting Diode Irradiation on Growth Characteristics and Regulation of Porphyrin Biosynthesis in Rice Seedlings

16-Mar-2017 | Tran, Lien Hong; Jung, Sunyo, International Journal of Molecular Sciences, 2017

We examined the effects of light quality on growth characteristics and porphyrin biosynthesis of rice seedlings grown under different wavelengths from light emitting diodes (LEDs). After 10 days of exposure to various wavelengths of LEDs, leaf area and shoot biomass were greater in seedlings ...

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Multidie LED combined with homogenizing optics to improve frequency response and intensity for FLIM applications

15-Mar-2017 | H.‐T. LIU, W.‐L. LIN, Y.‐L. FENG, Y. LIN, Y.‐C. CHEN, Journal of Microscopy, 2017

Summary Application of light‐emitting diodes (LEDs) in frequency‐domain fluorescence lifetime imaging microscopy (FLIM) has been limited by the trade‐off between modulation frequency and illumination intensity of LEDs, which affects the signal‐to‐noise ratio in fluorescence lifetime ...

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Solid Confinement of Quantum Dots in ZIF‐8 for Efficient and Stable Color‐Conversion White LEDs

14-Mar-2017 | Wen Ying, Yiyin Mao, Xiaobing Wang, Yi Guo, Haihing He, Zhizhen Ye, Shuit-Tong Lee, Xinsheng Peng, ChemSusChem, 2017

The powder form and low photoluminescence quantum yield (PLQY) of fluorescent metal‐organic frameworks (MOFs) present serious obstacle to fabricating high‐efficiency film‐like lighting devices. Here, we present a facile way to produce thin films of CdSexS1‐x/ZnS quantum dots (QDs)@ZIF‐8 with ...

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In-Situ Formed Type I Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode

13-Mar-2017 | Jin-Wook Lee; Yung Ji Choi; June-Mo Yang; Sujin Ham; Sang Kyu Jeon; Jun Yeob Lee; Young-Hyun Song; Eun Kyung Ji; Dae ..., ACS Nano, 2017

Excellent color purity with a tunable band gap renders organic–inorganic halide perovskite highly capable of performing as light-emitting diodes (LEDs). Perovskite nanocrystals show a photoluminescence quantum yield exceeding 90%, which, however, decreases to lower than 20% upon formation of a ...

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