ENGINEERING RESEARCH PAPERS

free EEE paper-light emitting diode-LED recent 2014




Nanoscale Plasmonic Light Emitting Diode
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Our research consists at developing a new method for information processing based on the local transduction between electrons and photons with a nanoscale plasmonic light emitting diode. This technology proposes to bridge nano-electronics with a nanophotonics layer for

Transcranial Light Emitting Diode Therapy (TCLT) and its Effects on Neurological Disorders
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Abstract The Transcranial LED Therapy (TCLT) is a modality of low-level energy therapy based on the principle of photons delivered in a non-invasive manner for the rehabilitation of some neurological conditions such as psychological disorders, traumatic brain injuries,

Curing depth of pit and fissure sealants with use of light emitting diode (LED) at different distances
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ABSTRACT In the process of caries prevention, placement of pit and fissure sealants is a low-priced, effective and safe procedure. Presently, clinical operators prefer LED lamps. In pediatric dentistry, certain complications might arise such as lack of patient cooperation The availability of new, higher intensity Blue Light-Emitting Diodes (LEDs), as used in the development of our LED phototherapy blanket, led us to hypothesise that our blue LED phototherapy system would phototransform bilirubin more rapidly, in vitro, than the current

Wavelength tunable infrared light emitting diode based on ordered ZnO nanowire/Si1-xGex alloy heterojunction
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ABSTRACT We proposed and developed a novel infrared light emitting diode (LED) based on ordered pn heterojunction built of p-Si1-xGex alloy and n-ZnO nanowires. The Electroluminescence (EL) emission of this LED is in the infrared range, which is

Pulsed Light-Emitting Diode Photography for Coarse Water Characterization
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An optical photography probe employing pulsed light-emitting diode (LED) illumination has been developed for application to coarse water measurement in wet steam. High image resolution (1.38 lm/pixel) and low exposure time (100ns) photographs capture details of

A programmable pulsed-light source using a light-emitting diode
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Abstract This report describes the hardware and firmware for a low-power pulsed-light source using a high-brightness LED. The device can wait for a trigger signal, delay a little and then apply a large current across the LED for a short period. The intent is to produce a

Relative evaluation of comfort level associated with light-emitting diode lighting based on near infrared spectroscopy
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Although the use of light-emitting diode (LED) lighting has rapidly become popular as the next-generation of lighting, the degree of comfort associated with these lights has not been sufficiently examined. Therefore, establishing both subjective and objective evaluation

Improving the performance of MEH-PPV based light emitting diode by incorporation of graphene nanosheets
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The effect of incorporation of graphene nanosheets on the efficiency of poly [2-methoxy-5-(20 -ethyl- hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) based light emitting diodes (LED) has been examined by varying the graphene concentration from 0 to 0.1 wt%. It was observed

The Long-term Effects of Red Light-emitting Diode Irradiation on the Proliferation and Differentiation of Osteoblast-like MC3T3-E1 Cells
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Low level laser therapy (LLLT) affects various biological processes, and it is said that the non-coherent light of the light-emitting diode (LED) has a similar action. The purpose of this study was to examine the effects of LED light on the proliferation and differentiation of

Efficiency Improvement of 590 nm AlGaInP Light Emitting Diode with a Reflective Top Electrode
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Abstract: In this work, enhancement of the light extraction efficiency of a 590 nm AlGaInP light-emitting diodes (LED) with a reflective top electrode (RTE) was investigated. A distributed Bragg reflector (DBR), consisting of AlAs/AlGaAs pairs, grown on an AlGaInP

Theoretical Investigation of Highly Efficient ZnO Heterostructure-based Bluish Light Emitting Diode
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ABSTRACT A comprehensive numerical analysis has been accomplished for ZnO system based double heterostructure visible light emitting diode (LED) with superior electrical and optical performances. The optimized device with thin active region of CdZnO layer having

ORGANIC LIGHT EMITTING DIODE DISPLAYS: ENABLING THE NEXT GENERATION OF ELECTRONICS
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Abstract:The current standards of display technologies, such as liquid crystal display (LCD), light emitting diode (LED) and plasma, are limited by their physical and aesthetic properties. Organic light emitting diode (OLED) displays do not have these limitations.

Numerical Analysis of Planar Light-Emitting Diode with Designed p-Electrode
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Abstract:Light-emitting diode (LED) with designed metal electrode to the top p- semiconductor layer is studied. Original numerical model and procedure are developed for the LED with nonuniform distributions of electrical and optical characteristics caused by

Effect of 6-Benzylaminopurine (BA) and Hyaluronic Acid (HA) under White Light Emitting Diode (LED) on Organogenesis in Protocorm-Like Bodies (PLBs) of
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Abstract: Growth and development of PLBs cultured in vitro largely dependent on the presence of different plant growth regulators. In this study, potential effect of BAand hyaluronic acid on organogenesis of protocorm-like bodies (PLBs)

Effects of flashing light-emitting diode (LED) of several colors on the growth of the microalga Isochrysis galbana
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The growth rate of Isochrysis galbana was determined under flashing light conditions (104 µmol m-2s-1 light intensity, 10 kHz frequency, and 50% of the duty cycle) of several colors. The most suitable light for the growth of I. galbana was blue (dominant wavelength: 470

Terahertz Emission from InGaN/GaN Multiple Quantum Well Light-Emitting DiodeHeterostructures under Two-Photon Excitation
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It should be pointed out that terahertz signals registered in our study were considerably lower than in Refs 2-4, especially at one-photon excitation (used in Refs 2-4). In part this can be explained by the fact that piezoelectric fields were lower due to lower indium content (x

Polarized Gan-Based Light-Emitting Diode with a Silver Sub Wavelength Grating and Dielectric Layer
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Abstract: The effect of silver/dielectric sub-wavelength gratings and silicon dioxide transition layer, when embedded onto InGaN/GaN-LED system, has been studied for enhancement of the polarized light. The SiO2 transition layer is placed between InGaN/GaN-LED and the

Radiation Model of Light Emitting Diode Based on Algainp Heterostructures with Multiple Quantum Wells
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Neutron degradation was investigated for AlGaInP light-emitting diodes with wavelengths in the 690 nm region. The process of degradation light output power is shown in three stages. Watt- ampere, volt-watt and current-voltage characteristic of the light-emitting diodes

INFLUENCE OF COLORED LIGHT-EMITTING DIODE ILLUMINATION ON THE GROWTH PERFORMANCE AND MEAT QUALITY TRAITS OF PEKIN DUCKS (
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The present experiment has been executed to find out the impact of different colors of light- emitting diode (LED) on growth performance and meat quality traits of Pekin ducks (Anas platyrhynchos). For this purpose, a total of 360 day-old mixed sex ducklings were

Light Emitting Diode in Comparison to Halogen Curing Technology: Microshear Bond Strength of Dental Composite Resin Restorative Material
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Abstract The aim of this study was to compare the micro-shear bond strength of composite resin cured with halogen visible light and blue light emitting diode curing units. Flat enamel surfaces of 50 segments of teeth were prepared. 50 cylindrical composite resin specimens

POLARIZED LIGHT VERSUS LIGHT-EMITTING DIODE ON HEALING OF CHRONIC DIABETIC FOOT ULCER
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Abstract. Background: Phototherapy is characterized by its ability to induce photo biological processes in both cellular and subcellular levels. Many studies and researches have recommended the successful application of light therapy in the

Fabrication and characterization of green light emitting diode
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Abstract: Phosphorescent polymer light emitting diodes (PLEDs) have been fabricated and characterized. A PLED was configured in an ITO/PEDOT: PSS/TPD: PBD: PVK: Ir (mppy) 3/LiF/Al device structure. Thicknesses of the active layer were optimized for an efficient

HIGH BRIGHTNESS LIGHT EMITTING DIODE DIMMER USING FLYBACK CONVERTER
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ABSTRACT High brightness LED dimmer using Flyback converter is an LED driver in which the brightness of LED can be controlled. Flyback converter is a DC-DC converter that can produce variable output voltage. The magnitude of Flyback converter output voltage can

led driver research papers 2014



Multi-string AC-powered LED driver with current regulation reduction based on simple circuitry
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Abstract: In this letter, a new simple circuitry LED driver with current reduction is proposed, realized and experimentally validated. The proposed circuit comprises with very few components intended for making a cost effective and compact design while still shows a

An Experiment Demonstration of A LED Driver Based on A 2 nd Order Pre-emphasis Circuit for Visible Light Communications
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Abstract:We demonstrate a proposed LED driver with a 2nd order pre-emphasis circuit for visible light communications with a E/O/E bandwidth of 130 MHz, and with a flatness of 0.4 dB up to 110MHz. Experiments show that the bit error rate of the system at 300 Mbps is

Highly AC Voltage Fluctuation-Resistant LED Driver with Sinusoid-Like Reference
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Abstract A novel converter-free AC LED driver that is highly resistant to the fluctuation of AC voltage is proposed in this study. By removing large passive components, such as the bulky capacitor and the large-value inductor, the integration of the driver circuit is enhanced

Analytical study of harmonics issued from LED lamp driver
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Abstract:Harmonics are always generated in any non-linear electrical/electronic systems, and cause severe problems in terms of performance and operation. This paper focuses on analytical study of harmonics originated from LED lamps usually functioning using a driver

Overstress-Free Charge Pump White LED Driver
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(LED) driver that utilized charge pump in boosting the input voltage. The output voltage had been made sure that it was sufficient enough to overcome the forward voltage of the LED as well as provide voltage headroom for the transistors in every LED channel branch. The

Single-switch LED Driver with the Function of Power Factor Correction
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Abstract. This paper proposes asingle-switch LED driver with the function of power factor correction (PFC). The proposed driver uses a single-switch power conversion circuit topology which are the boost converter and the flyback converter into. The proposed

The Study of LED Linear Dimming with Hysteresis Current Driver and Peak Current DetectionDriver
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This paper presents mathematical analysis, design and simulation of a quadratic buck converter used as LED lamp driver, and the performance of the converter is compared with two different control strategies. The objective is to provide tight regulation of the LED

Design and Implementation of a White-Led Driver for Cell-Phones Application
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Abstract This paper presents a white light emitter diode (LED) driver suitable for mobile applications. The proposad is capable to drive up to three legs. The current flowing in the WLEDs, which is provided by an embedded 8-bit Digital-to-Analog Converter (DAC), is not

High-Efficiency Led Driver without Electrolytic Capacitor for Street
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Abstract: High-brightness light-emitting diodes (LEDs) are considered as a remarkable lighting device due to their high reliability, chromatic variety, and increasing efficiency. As a consequence, a high number of solutions for supplying LED strings are coming out. One-

automatic led light



Home LED light control system with automatic brightness tuning for the difference in luminous decay
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ABSTRACT In this paper we present a design at the software and hardware modules of an embedded board with a sensor and an interface circuit both to control home LED lighting appliances and to avoid their difference in brightness caused by luminous decay. Our

Automatic light control in domotics using artificial neural networks
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ABSTRACT Home Automation is a field that, among other subjects, is concerned with the comfort, security and energy requirements of private homes. The configuration of automatic functions in this type of houses is not always simple to its inhabitants requiring the initial

Home LED light control system with automatic brightness tuning for the difference in luminous decay
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ABSTRACT In this paper we present a design at the software and hardware modules of an embedded board with a sensor and an interface circuit both to control home LED lighting appliances and to avoid their difference in brightness caused by luminous decay. Our

AUTOMATIC LIGHT CONTROL FOR EFFICIENT DOMESTIC USE OF ENERGY
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ABSTRACT It is a major task of every household, company and industry to save energy by using it more efficiently. This could benefit individuals and the country as a whole. Different aspects of energy saving and efficient energy usage are examined here for

State-of-the-Art Logarithmic Transimpedance Amplifier with Automatic Gain Control and Ambient Light Rejection for fNIRS
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TECHNICALAbstract Logarithmic transimpedance amplifier (LogTIA) is practically useful in systems that need scale-invariant and wide dynamic range operation. Its sensitivity to the contrast (ac/dc) of the input and its scale-invariant fractional amplification is beneficial in

Automatic Street Light Control System Using Microcontroller
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ABSTRACT This paper aims at designing and executing the advanced development in embedded systems for energy saving of street lights. Nowadays, human has become too busy, and is unable to find time even to switch the lights wherever not necessary. The

Design Of Semi-Automatic Traffic Light Control System
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ABSTRACT Today's traffic light system has a lot of limitations at road junction. The system is not flexible or in other words cannot modify on real time. The static traffic control have fixed timing for the three traffic lights the green, yellow and red . The cars waste a lot of fuel

IMPLEMENTATION OF AUTOMATIC SOLAR STREET LIGHT CONTROL CIRCUIT
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ABSTRACT An automatic control circuit for LED street lamp is designed. Solar power is utilized and electric energy is stored in battery. This circuit works in four mode control,(1) light control,(2) intensity adjustment,(3) under voltage and overvoltage control and (4)

Improving light spot tracking for an automatic headlight control algorithm
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ABSTRACT target tracking is an important task for an Automatic Headlight Control Algorithm (AHC). The task is challenging due to the presence of small, closely spaced light spots and the limited computing power of an embedded platform. Thus the tracking

VIII-AUTOMATIC CONTROL OF LIGHT INTENSITY AND SPECTRAL COMPOSITION USING SMALL COMPUTER
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SUMMARY A radiation system with automatic control of intensity and spectral composition of light in a growth cabinet was developed. Feed-forward system with an on-line computer was adopted for control of spectral composition, combining the feedback system of light

enhanced technologies of illumination control in led lighting control



Light tamers
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Displays and lasers Such a micro lens array could work in projection screens and enhance and features that are not possible with diffractives or any other diffuser technology. Most diffuser technologies have little difficulty generating, for example, round diffusion patterns.

The possibility to control the metabolism of green vegetables and sprouts using light emitting diode illumination
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in this field and developed the outset for new progressive vegetableYgrowing technologies. The enhanced antioxidant activity could be associated to the expression of antioxidant by the Lithuanian Science and Study foundation under the high technology project PHYTOLED.

Synergies of controller-based LED drivers and quality solid-state lighting
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and SSL in particular, between the main potential energy-efficient technologies in the While solid-state light sources experiment rapid technological developments, the drivers and control of current, voltage, temperature or optical signals will furthermore enhance the capability of

Ultrathin self-assembled layers at the ITO interface to control charge injection and electroluminescence efficiency in polymer light-emitting diodes
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The conducting CP interlayers are found to enhance both carrier injection and electroluminescence This build-up of electron concentration near the ITO anode further enhances electron±hole from leaving the emissive polymer plays an important role in enhancing the efficiency.

3D-camera of high 3D-frame rate, depth-resolution and background light elimination based on improved PMD photonic mixer device-technologies
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Resolution and Background Light Elimination Based on Improved PMD Photonic Mixer Device-Technologies die with an 8 stage readout circuitry using a standard wire bonding technology. the grayscale image of the scene can be detected for an enhanced image processing.

Gesture-controlled user interfaces, what have we done and what's next
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for elderly and disable people has been reviewed along with the other gesture technologies. In the Proceedings of International Conference on Hybrid Information Technology (ICHIT'06 Improving Web accessibility through an enhanced open- source browse, IBM System Journal

Digital signal processing for light emitting diode based visible light communication
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Abstract:The realization of enhanced efficiency light emit- ting diodes (LED) and the trend to The SRRC filter at the Rx then enhances the SNR of the received signal. and experimentally demonstrated the 4-ASK modulation with FIR digital equalizer to further enhance the direct

Development of Phosphors for LEDS
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LED long UV radiation, will produce white light suitable for general- purpose illumination. properties that influence quantum efficiency and develop methods to enhance QE through lamps would certainly represent the most significant revolution in lighting technology since the

Led-based visible light communication system: a brief survey and investigation
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Light emitting diodes: The recent emerging developments in LEDtechnologies have produced significant This iLight technology has many characteristics that are different from IR. However, different modulation schemes are being experimented for enhanced performance.

Standardizing communication between lighting control devices
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Integrated lightingcontrols can significantly improve building performance, increase energy efficiency, and enhance occupant comfort Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology, Building Technologies Program, of

A Simplified LED Converter Design and Implement.
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Author (Assistant Professor of Department of Mechanical Engineering and RD Center for Membrane Technology, Chung Yung The illumination module of high power LEDs for test is the Luxeon Power Light Source But the norm of electromagnetic interference will enhance.

Integrating automated shading and smart glazings with daylight controls
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occupants with a visual connection with the outdoors and daylight to enhance the quality of the indoor environment. Fortunately the technology elements adaptive controls to fully realize the potentials of these emerging technologies. The continuing studies Page 9.

Energy Efficient Lighting Control System Design For Corridor illumination
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in input power, as well as reductions in peak power demand, and enhanced lighting flexibility. These sensors can also be used to enhance the efficiency of centralized controls by Some sensors use infrared technology, some use ultrasonic technology, while others use a

LED TV: technology overview and the DLP advantage
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Conclusion As LEDtechnology developments continue to improve brightness and reliability, LEDillumination may of the fast LED switching time to improve video performance, enhance contrast without With the advantages of LED and DLP technologies working together, it is

The promise and challenge of solid-state lighting
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but nitride devices producing green light need to have their efficiencies enhanced by a but should be reachable as we improve our understanding and develop appropriate new technologies. OLED technology There are two main classes of OLED devices: those made with

Home LED light control system with automatic brightness tuning for the difference in luminous decay
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is not only to reduce the power consumption but also to enhance the illuminationLED multi-chip module packaging, International Conference on Electronic Packaging Technology High Hybrid Indoor Ambient Light and Thermal Energy Sources for Enhanced Performance of

Multi-Sensor wireless signal aggregation for environmental monitoring system via multi-bit data fusion
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various types of sensors developed for environmental monitoring systems to enhance multi-Sensor Many related technologies are widely used in the surrounding environment for greater frequency bands including 2.4GHz, 868MHz, 915MHz and 128-bit encryption technology.

Energy saving lighting efficiency technologies
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Least expensive and convenient. ·Can be directed freely. ·Enhance color. ·Give us comfort. The turning point was the oil shock in the 1970s. Efficiency technologies have been actively developed for fluorescent lamps. Enhancedlamp efficacy is the present issue.

The light stages and their applications to photoreal digital actors
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the Light Stage 2 system at the USC Institute for Creative Technologies in the Through technology licensees Aguru Images and Light Stage, LLC, the gradient illumination facial The basic gradient illumination facial scanning process has been usefully enhanced in several ways.

LEDs lighting: Two case studies
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With regard to the luminaries technologies, efficiency of lamps and optical systems has been historical luminaries (one central and four lateral ceiling lights) and to enhance the architectural The need to find new technological solutions for lighting systems is proved by numerous

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