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734 Newest Publications about the topic leds

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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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White light‐emitting diodes: History, progress, and future

02-Mar-2017 | Jaehee Cho, Jun Hyuk Park, Jong Kyu Kim, E. Fred Schubert, Laser & Photonics Reviews, 2017

Abstract About twenty years ago, in the autumn of 1996, the first white light‐emitting diodes (LEDs) were offered for sale. These then‐new devices ushered in a new era in lighting by displacing lower‐efficiency conventional light sources including Edison's venerable incandescent lamp as well ...

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Sensors, Vol. 17, Pages 423: Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site

23-Feb-2017 | Havran, Vlastimil ; Hošek, Jan ; Němcová, Šárka ; Čáp, Jiří ; Bittner, Jiří, Sensors, 2017

We propose a miniaturised light stage for measuring the bidirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios. The main principle of our lightweight BTF acquisition gantry is a compact ...

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Chemical Modification of Semiconductor Surfaces for Molecular Electronics

23-Feb-2017 | Ayelet Vilan; David Cahen, Chemical Reviews, 2017

Inserting molecular monolayers within metal/semiconductor interfaces provides one of the most powerful expressions of how minute chemical modifications can affect electronic devices. This topic also has direct importance for technology as it can help improve the efficiency of a variety of ...

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Optimized photoluminescence of red phosphor Na2SnF6:Mn4+ as red phosphor in the application in “warm” white LEDs

21-Feb-2017 | Luqing Xi, Yuexiao Pan, Xian Chen, Shaoming Huang, Mingmei Wu, Journal of the American Ceramic Society, 2017

Abstract The Mn4+ activated fluostannate Na2SnF6 red phosphor was synthesized from starting materials metallic tin shots, NaF, and K2MnF6 in HF solution at room temperature by a two‐step method. The formation mechanism responsible for preparing Na2SnF6:Mn4+ (NSF:Mn) has been investigated. The ...

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Chemical lift‐off process for nitride LEDs from an Eco‐GaN template using an AlN/strip‐patterned‐SiO2 sacrificial layer

20-Feb-2017 | Ray‐Hua Horng, Hsu‐Hung Hsueh, Sin‐Liang Ou, Chi‐Tsung Tsai, Tsung‐Yen Tsai, Dong‐Sing Wuu, physica status solidi (a), 2017

In this research, a nitride light‐emitting diode (LED) fabricated on an electroplated Cu substrate can be removed from a GaN/sapphire (Eco‐GaN) template by conducting the chemical lift‐off (CLO) process using an AlN/strip‐patterned‐SiO2 intermediate sacrificial layer. The regrowth GaN epilayer ...

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