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820 Newest Publications about the topic leds

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Highly Porous Polymer Aerogel Film‐Based Triboelectric Nanogenerators

18-Jan-2018 | Qifeng Zheng, Liming Fang, Haiquan Guo, Kefang Yang, Zhiyong Cai, Mary Ann B. Meador, Shaoqin Gong, Advanced Functional Materials, 2018

Abstract A novel class of high performance polymer porous aerogel film‐based triboelectric nanogenerators (A‐NGs) is demonstrated. The A‐NGs, made of a pair of highly porous polymer films, exhibit much higher triboelectric outputs than the corresponding dense polymer film‐based triboelectric ...

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Irradiation-Induced Palladium-Catalyzed Decarboxylative Heck Reaction of Aliphatic N-(Acyloxy)phthalimides at Room Temperature

18-Jan-2018 | Guang-Zu Wang; Rui Shang; Yao Fu, Organic Letters, 2018

It is reported that Pd(PPh3)2Cl2 in combination with 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) under irradiation of blue LEDs efficiently catalyzes a decarboxylative Heck reaction of vinyl arenes and vinyl heteroarenes with aliphatic N-(acyloxy)phthalimides at room temperature. A ...

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Use of long-term stable CsPbBr3 perovskite quantum dots in phospho-silicate glass for highly efficient white LEDs

17-Jan-2018 | Xiaoxuan Di; Zemin Hu; Jutao Jiang; Meiling He; Lei Zhou; Weidong Xiang; Xiaojuan Liang, Chemical Communication, 2018

We report the synthesis of CsPbBr3 QDs with great stability and high quantum yield in phospho-silicate glass, which was fabricated by using a heat-treatment approach, for white light emitting devices. QD glasses exhibited excellent photo- and thermal stability, and significantly prolonged the ...

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Strategy of Solution-Processed All-Inorganic Heterostructure for Humidity/Temperature-Stable Perovskite Quantum Dot Light-Emitting Diodes

16-Jan-2018 | Zhifeng Shi; Sen Li; Ying Li; Huifang Ji; Xinjian Li; Di Wu; Tingting Xu; Yongsheng Chen; Yongtao Tian; Yuantao Zhan ..., ACS Nano, 2018

Recently, a pressing requirement of solid-state lighting sources with high performance and low cost has motivated increasing research in metal halide perovskites. However, the relatively low emission efficiency and poor operation stability of perovskite light-emitting diodes (LEDs) are still ...

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Improving the Light‐Extraction Efficiency of AlGaN DUV‐LEDs by Using a Superlattice Hole Spreading Layer and an Al Reflector

15-Jan-2018 | Noritoshi Maeda, Masafumi Jo, Hideki Hirayama, physica status solidi (a), 2018

AlGaN based deep‐ultraviolet light‐emitting diodes (DUV‐LEDs) have a wide range of applications and a large market is expected. However, the efficiency of DUV‐LEDs is still much lower than that of blue LEDs due to a quite low light‐extraction efficiency (LEE). We improved the LEE of DUV‐LEDs by ...

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Improving the Light‐Extraction Efficiency of AlGaN DUV‐LEDs by Using a Superlattice Hole Spreading Layer and an Al Reflector

15-Jan-2018 | Noritoshi Maeda, Masafumi Jo, Hideki Hirayama, physica status solidi (a), 2018

AlGaN based deep‐ultraviolet light‐emitting diodes (DUV‐LEDs) have a wide range of applications and a large market is expected. However, the efficiency of DUV‐LEDs is still much lower than that of blue LEDs due to a quite low light‐extraction efficiency (LEE). We improved the LEE of DUV‐LEDs by ...

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High‐Efficiency, High‐Power AlGaInP Thin‐Film LEDs with Micron‐Sized Truncated Cones as Light‐Extraction Structures

15-Jan-2018 | Xue‐lun Wang, Naoto Kumagai, Guo‐dong Hao, physica status solidi (a), 2018

Micron‐sized truncated cones with a top surface diameter and a height on the order of the emission wavelength are prepared on the light‐extraction surface of a high‐power thin‐film AlGaInP red LED as the light‐extraction structure. An external quantum efficiency of ≈39.3% is obtained from a ...

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A novel red emitting phosphor LiBaB9O15:Sm2+/Sm3+, li+ with broad excitation band for white LEDs

12-Jan-2018 | Ting Li, Zhijun Wang, Panlai Li, Shuchao Xu, Qiongyu Bai, Zhiping Yang, Luminescence, 2018

Abstract A novel tunable red emitting phosphor LiBaB9O15:Sm2+/Sm3+, Li+ with broad excitation band was synthesized by a high temperature solid‐state method. Luminescence properties were investigated in detail by luminescence, X‐ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity ...

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Improved Light Output Power of 16 × 16 Pixelated Micro‐LEDs for Headlights by Enhancing the Reflectivity and Coverage of the p‐Electrode

10-Jan-2018 | Tae Kyoung Kim, Moon Uk Cho, Jae Min Lee, Yu‐Jung Cha, Seung Kyu Oh, Bikramjit Chatterjee, Jae‐Hyun Ryou, Sukwon Cho ..., physica status solidi (a), 2018

A pixel array of micro‐light emitting diodes (µ‐LEDs) based on a flip‐chip structure and driven by a passive matrix is fabricated. The array is fabricated through multi‐level metallization using a photosensitive polyimide (PSPI) inter‐metal dielectric (IMD) layer. The device consisted of ...

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Stable Light‐Emitting Diodes Using Phase‐Pure Ruddlesden–Popper Layered Perovskites

03-Jan-2018 | Hsinhan Tsai, Wanyi Nie, Jean‐Christophe Blancon, Constantinos C. Stoumpos, Chan Myae Myae Soe, Jinkyoung Yoo, Jared ..., Advanced Materials, 2018

Abstract State‐of‐the‐art light‐emitting diodes (LEDs) are made from high‐purity alloys of III–V semiconductors, but high fabrication cost has limited their widespread use for large area solid‐state lighting. Here, efficient and stable LEDs processed from solution with tunable color enabled by ...

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