Results 11 to 20 of about 10,427,001 (301)

Enhanced Light Output Power of GaN Light-Emitting Diodes with Graphene Film as a Transparent Conducting Electrode

Japanese Journal of Applied Physics, 2011
We report the enhanced light output power of GaN-based light-emitting diode (LED) by using graphene film as a transparent conducting electrode. Monolayer graphene was synthesized on copper foil by using chemical vapor deposition method and directly transferred onto the GaN-LED as a top electrode.
Tae Hoon Seo, Tae Su Oh, Seung Jin Chae, Ah Hyun Park, Kang Jea Lee, Young Hee Lee, Eun-Kyung Suh   +6 more
openaire   +2 more sources

Demonstration of Power-over-Fiber with Watts of Output Power Capabilities over Kilometers or at Cryogenic Temperatures

Photonics
We demonstrate the use of laser diodes and multijunction photovoltaic power converters to efficiently deliver watts of electrical power for long-distance or cryogenic applications. Transmission through single-mode and multi-mode fibers at the wavelengths
Simon Fafard, Denis Masson
doaj   +2 more sources

High Luminous Efficacy Phosphor-Converted Mass-Produced White LEDs Achieved by AlN Prebuffer and Transitional-Refraction-Index Patterned Sapphire Substrate

Nanomaterials, 2022
Constant advance in improving the luminous efficacy (ηL) of nitride-based light-emitting diodes (LEDs) plays a critical role for saving measurable amounts of energy.
Shuo Zhang, Meng Liang, Yan Yan, Jinpeng Huang, Yan Li, Tao Feng, Xueliang Zhu, Zhicong Li, Chenke Xu, Junxi Wang, Jinmin Li, Zhiqiang Liu, Xiaoyan Yi   +12 more
doaj   +1 more source

Nanoparticle-Doped Polydimethylsiloxane Fluid Enhances the Optical Performance of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes

Nanoscale Research Letters, 2019
This paper proposes a new encapsulation structure for aluminum nitride-based deep UV light-emitting diodes (DUV-LEDs) and eutectic flip chips containing polydimethylsiloxane (PDMS) fluid doped with SiO2 nanoparticles (NPs) with a UV-transparent quartz ...
Zhi Ting Ye, Yung-Min Pai, Chih-Hao Lin, Lung-Chien Chen, Hong Thai Nguyen, Hsiang-Chen Wang   +5 more
doaj   +1 more source

Improving the External Quantum Efficiency of High-Power GaN-Based Flip-Chip LEDs by Using Sidewall Composite Reflective Micro Structure

Micromachines, 2021
For high-power applications, it is important to improve the light extraction efficiency and light output of the vertical direction of LEDs. Flip-chip LEDs (FCLEDs) with an Ag/SiO2/distributed Bragg reflector/SiO2 composite reflection micro structure (CRS)
Liang Xu, Kaiping Fan, Huiqing Sun, Zhiyou Guo   +3 more
doaj   +1 more source

Monolithically Integrated Light Feedback Control Circuit for Blue/UV LED Smart Package

IEEE Photonics Journal, 2017
Given the performance decay of high-power light-emitting diode (LED) chips over time and package condition changes, having a reliable output light for sensitive applications is a point of concern.
Zahra Kolahdouz Esfahani, Massoud Tohidian, Henk van Zeijl, Mohammadreza Kolahdouz, Guoqi Zhang   +4 more
doaj   +1 more source

A Review on the Progress of AlGaN Tunnel Homojunction Deep-Ultraviolet Light-Emitting Diodes

Crystals, 2023
Conventional deep-ultraviolet (UV) light-emitting diodes (LEDs) based on AlGaN crystals have extremely low light-emission efficiencies due to the absorption in p-type GaN anode contacts.
Kengo Nagata, Taichi Matsubara, Yoshiki Saito, Keita Kataoka, Tetsuo Narita, Kayo Horibuchi, Maki Kushimoto, Shigekazu Tomai, Satoshi Katsumata, Yoshio Honda, Tetsuya Takeuchi, Hiroshi Amano   +11 more
doaj   +1 more source

A Numerical Model for Studying Multimicrochip and Single-Chip LEDs With an Interdigitated Mesa Geometry

IEEE Photonics Journal, 2013
A 3-D numerical model has been developed to investigate the transient thermal, electrical, and optical output performance of a single-chip light-emitting diode (LED) with an interdigitated mesa geometry under dc operation and a multimicrochip LED under ...
Farn-Shiun Hwu, Ti-Hsiang Sung, Chun-Hung Chen, Jia-Wei Tseng, Heng Qiu, Jyh-Chen Chen   +5 more
doaj   +1 more source

Efficient superfluorescent light sources with broad bandwidth [PDF]

, 1997
We demonstrate various efficient broad-band light sources at ~1µm wavelength with a 3dB bandwidth of up to 65nm at 108mW output power, based on rare-earth doped silica fibers and a simple adjustable spectral ...
Tropper, A.C., Hanna, D.C., Nilsson, J., Paschotta, R.   +3 more
core   +1 more source

A Hybrid Indoor Ambient Light and Vibration Energy Harvester for Wireless Sensor Nodes

Sensors, 2014
To take advantage of applications where both light and vibration energy are available, a hybrid indoor ambient light and vibration energy harvesting scheme is proposed in this paper.
Hua Yu, Qiuqin Yue, Jielin Zhou, Wei Wang   +3 more
doaj   +1 more source