Characterization of a mortar made with cement and sludge from the light-emitting diode manufacturing process

2014 ◽  
Vol 56 ◽  
pp. 106-112 ◽  
Author(s):  
Wei-Jer Wang ◽  
Cheng-Der Wang ◽  
Tzen-Chin Lee ◽  
Cheng-Cheng Chang
Keyword(s):  
Manufacturing Process ◽  
Light Emitting Diode ◽  
Light Emitting

Characterization and Elimination of Forward Snapback Defects in GaAs Light Emitting Diodes

1996 ◽  
Author(s):  
J. Zimmer ◽  
D. Nielsen ◽  
T.A. Anderson ◽  
M. Schade ◽  
N. Saha ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Light Emitting Diode ◽  
Elevated Concentration ◽  
Forward Voltage ◽  
Light Emitting ◽  
Intermittent Yield ◽  
Si Doped ◽  
Secondary Ion ◽  
Furnace Pressure

Abstract The p-n junction of a GaAs light emitting diode is fabricated using liquid phase epitaxy (LPE). The junction is grown on a Si doped (~1018/cm3) GaAs substrate. Intermittent yield loss due to forward voltage snapback was observed. Historically, out of specification forward voltage (Vf) parameters have been correlated to abnormalities in the junction formation. Scanning electron (SEM) and optical microscopy of cleaved and stained samples revealed a continuous layer of material approximately 2.5 to 3.0 urn thick at the n-epi/substrate interface. Characterization of a defective wafer via secondary ion mass spectroscopy (SIMS) revealed an elevated concentration of O throughout the region containing the defect. X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) data taken from a wafer prior to growth of the epi layers did not reveal any unusual oxidation or contamination. Extensive review of the processing data suggested LPE furnace pressure was the obvious source of variability. Processing wafers through the LPE furnace with a slight positive H2 gas pressure has greatly reduced the occurrence of this defect.

scholarly journals Implantable Optrode Array for Optogenetic Modulation and Electrical Neural Recording

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 725
Author(s):  
Saeyeong Jeon ◽  
Youjin Lee ◽  
Daeho Ryu ◽  
Yoon Kyung Cho ◽  
Yena Lee ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Neural Recording ◽  
Electrophysiological Recording ◽  
Light Emitting ◽  
Technological Advances ◽  
Neuroscience Research ◽  
Cell Type Specific ◽  
Novel Design

During the last decade, optogenetics has become an essential tool for neuroscience research due to its unrivaled feature of cell-type-specific neuromodulation. There have been several technological advances in light delivery devices. Among them, the combination of optogenetics and electrophysiology provides an opportunity for facilitating optogenetic approaches. In this study, a novel design of an optrode array was proposed for realizing optical modulation and electrophysiological recording. A 4 × 4 optrode array and five-channel recording electrodes were assembled as a disposable part, while a reusable part comprised an LED (light-emitting diode) source and a power line. After the characterization of the intensity of the light delivered at the fiber tips, in vivo animal experiment was performed with transgenic mice expressing channelrhodopsin, showing the effectiveness of optical activation and neural recording.

Design, Measurements and Characterization of Smart Electronic Board for PV Streetlight based on LED and High Intensity Discharge Lamps

2013 ◽  
pp. 153-165
Author(s):  
Paolo Visconti ◽  
Daniele Romanello ◽  
Giovanni Zizzari ◽  
Vito Ventura ◽  
Giorgio Cavalera
Keyword(s):  
Rural Areas ◽  
High Intensity ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Electronic Board ◽  
Lighting Systems ◽  
And Control ◽  
Near Future ◽  
Hid Lamps

This work presents an electronic board for driving and control of High Intensity Discharge (HID) lamps and Light Emitting Diode (LED) lamps. The proposed electronic board is able to drive HID or LED lamps by means of a reconfigurable output. This feature allows using the ballast in lighting systems that currently use traditional discharge lamps, as well as keeping the same ballast when discharge lamps are replaced by LED modules in the near future, when LED street lighting systems will be more affordable. Additionally, since the lighting system is designed to be used in rural areas where there is no public electricity, each lighting point incorporates a system to convert solar energy into continuous voltage by means of photovoltaic panels. In this work, energy saving issues are taken into account.

scholarly journals Fabrication and Characterization of Light Emitting Diode Based on n-ZnO Nanorods Grown Via a Low-Temperature

2020 ◽  
Vol 1535 ◽  
pp. 012009
Author(s):  
Sabah M. Mohammad ◽  
Nabeel M. Abd-Alghafour ◽  
Z. Hassan ◽  
Naser M. Ahmed ◽  
Amal Mohamed Ahmed Ali ◽  
...  
Keyword(s):  
Low Temperature ◽  
Light Emitting Diode ◽  
Zno Nanorods ◽  
Light Emitting ◽  
Fabrication And Characterization

Preparation and luminescence characterization of GGAG:Ce3+,B3+ for a white light-emitting diode

2008 ◽  
Vol 43 (8-9) ◽  
pp. 1982-1988 ◽  
Author(s):  
Jun-Gill Kang ◽  
Myung-Kyo Kim ◽  
Kwang-Bok Kim
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Light Emitting

Synthesis and Characterization of Stannane-Terminated Poly(silole-co-germole) for the Evaluation of Luminescent Polymeric Light-Emitting Diode

2011 ◽  
Vol 11 (5) ◽  
pp. 4620-4623 ◽  
Author(s):  
Myoung-Hee Kim ◽  
Jong Hyun Kim ◽  
Jung Pyo ◽  
Hee-Gweon Woo ◽  
Kap-Seung Yang ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Synthesis And Characterization ◽  
Light Emitting
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