Kang Bae Material Science MEEN 3344

Slides:



Advertisements
Similar presentations
TERM 2 SCIENCE ACE DONE BY: HOON TIAN JUN, TERRENCE LEDs VS Energy-saving Light Bulbs.
Advertisements

Optical sources Lecture 5.
THE LIGHT EMITTING DIODE
USING LIGHT EMITTING DIODES FOR LIGHTING BY: GRANT GORMAN AND ALEC PAHL 5/6/2013 ABSTRACT: LIGHT EMITTING DIODES ARE SEMICONDUCTOR DEVICES THAT EMIT LIGHT.
An LED dancing penguin in Locomotive Park, Lewiston Idaho. Created by Dr. Jesse Huso & Dr. Leah Bergman Department of Physics, University of Idaho Supported.
LED – Light Emitting Diodes Anne Lynn Gillian-Daniel Ben Taylor Interdisciplinary Education Group University of Wisconsin-Madison.
CH. 3 Solar Cell Basic III: Principle Organic Materials for Electronics and Photonics II.
LED Lighting Technology By: Dan Kaser 9/17/2007. What Are LED’s? LED is an acronym for Light Emitting Diode Instead of a filament they use a semiconductor.
Light Emitting Diode: LED. What is an LED?  Light-emitting diode  Semiconductor  Has polarity.
Robots Week 3a Lego Light Sensors Betsy Natter Design & Society.
Physics of Semiconductor Devices. Formation of PN - Junction When a P-type Semiconductor is joined together with an N-type Semiconductor a PN junction.
Semiconductor Devices Physics 355. Semiconductor Devices The control of semiconductor electrical and optical properties make these materials useful for.
Hands-on activities with LEDs and light Nikolaos Voudoukis Sarantos Oikonomidis George Kalkanis Science, Technology and Environment Laboratory, Pedagogical.
Semiconducting Light- Emitting Devices James A. Johnson 16 December 2006.
How to Color LEDs LED Color Standard BrightnessHigh Brightness Chip Material lpk (NM) Iv (mcd) Viewing Angle Chip Material lpk (NM) Iv 3 (mcd) Viewing.
Xiaoyu Sun  Intro – what is led  How does it works  Where it uses  Advantages and disadvantages  Green city
CBE 555 Matt Zauner Geological Engineering Major.
LED’s, what is it? LED: (Light-emitting diode) is an electric device that allows current to go in one way. LED uses a special material called semiconductors.
By: Garett henriksen 5/4/2015
If a substance emits a different color of light than it absorbs, that is called Fluorescence Quantum dots in solution fluoresce under UV light at different.
SPECIAL DIODES P. SYAM SUNDAR ASSOCIATE PROFESSOR DEPT. OF ECE K L UNIVERSITY.
LED Lights vs. Incandescent Lights vs. CFLs. What are LEDS ? LEDs, or light–emitting diodes, are semiconductor devices that produce visible light when.
ZENER DIODE / BREAKDOWN DIODE
Characteristics, Structures, and Applications.  Description of LED and Infrared LED  Schematic Symbol  Structure  Function and Characteristics  Application.
Light Emitting Diodes (LEDs) By: Love Lor “There are numerous sources used for lighting. The ideal light source is definitely one that has lower costs.
Images:
1 Introduction to Optoelectronic Devices Dr. Jing Bai Assistant Professor Department of Electrical and Computer Engineering University of Minnesota Duluth.
LIGHT EMITTING DIODES (LED) By: Chris Grimm Megdi Morina Mike Oster Tony Joe Chupela.
IEEE’s Hands on Practical Electronics (HOPE) Lesson 6: PN Junctions, Diodes, Solar Cells.
Solid State Lighting: The Future is here Xavier Fernando Ryerson University.
Chapter 3 Astronomy TEST REVIEW. WHAT ARE ALL THE FORMS OF ENERGY THAT COME FROM THE SUN? Radio waves Microwaves Infrared Rays (Heat) Visible light Ultraviolet.
Solar Cells Early development of solar tech. starts in the 1960s Conversion of sunlight to electricity – by photovoltaic effect In 1974 only.
What ARE all those little things anyway?
LIGHT EMITTING DIODES A brief analysis. What is an LED? A light emitting diode (LED) is essentially a PN junction opto- semiconductor that emits a monochromatic.
A Light-Emitting Diode (LED) in essence is a P-N junction solid-state semiconductor diode that emits light when a current is applied though the device.
Light Emitting Diode By Rabail Faizan.. What is a LED?  A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps.
Daniel Bowser Fernando Robelo
CHAPTER 9: PHOTONIC DEVICES
By Squadron Leader Zahid Mir CS&IT Department, Superior University PHY-BE -13 Light Emitting Diode & Tunnel Diode.
Photovoltaics Continued: Chapter March 2014
SMART LIGHTING Diodes K. A. Connor Mobile Studio Project Center for Mobile Hands-On STEM SMART LIGHTING Engineering Research Center ECSE Department Rensselaer.
PRACTICAL # 11 Introduction to light emitting diode (LED), its working principle and terminal identification By:Engr.Irshad Rahim Memon.
By: Christopher Heil November 18, What is OLED? An Organic Light-emitting Diode (OLED) is a light emitting diode (LED) that is made of semiconducting.
Light Emitting Diodes Presented by-Aamna khan Manali Kapadia.
QW 1-14 Draw a Venn Diagram to compare and contrast Transverse and Longitudinal Waves.
SEMICONDUCTOR PHYSICS NEW AGE LIGHTING TECHNOLOGIES THEN AND NOW HUCK GREEN GRADUATE STUDENT UNIVERSITY OF NEW MEXICO SCHOOL OF ELECTRICAL ENGINEERING.
LED Research James Edwards. What is an LED? An LED is also called by it’s full name a “Light Emitting Diode” They are compact light sources Much more.
Light Emitting Diodes(LED) and Organic Light Emitting Diodes(OLED)
Onoprienko N. E-71. LED or light emitting diode - a semiconductor device with a pn junction created by the optical radiation by passing electric current.
Opto-electronic Devices A study of the devices and their characteristics…. LEDs are available in different shapes, sizes & colours.
L.E.D. Labs. Background Light is transmitted as electromagnetic waves in tiny packets called photons. The energy associated with each photon is inversely.
Physics of Semiconductor Devices
It converts light energy into electrical energy.
Physics of Semiconductor Devices Mr. Zeeshan Ali, Asst. Professor
Chapter 9. Optoelectronic device
Circuit Components 4.1 Amplifier Fundamentals
Photonics-More 22 February 2017
Color How do we see color? What is color?
A Nice Decorative Way to Set the Mood of Your Home
Photonics-LED And LASER 29 February 2016
Atomic Emission Spectra
Light Emitting Diode: LED
Actives Devices: Diodes, Transistors, Tubes
Atomic Emission Spectra
Types of Light Production
PRINCIPLE AND WORKING OF A SEMICONDUCTOR LASER
LED Basics Jim Hinds RICHMOND CONTROLS.
Light.
Photonics-More 6 March 2019 One More slide on “Bandgap” Engineering.
Sources of Light.
Presentation transcript:

Kang Bae Material Science MEEN 3344 LEDs Kang Bae Material Science MEEN 3344

What is LED LED stands for Light Emitting Diode. LED is a semiconductor device that produces infrared lights when electric current is applied to the device This process is also called Electroluminescense

HISTORY OF LED Radio Corporation of America first reported on infrared emission from gallium arsenide in 1955. Texas Instrument found Gallium Arsenide emits infrared lights when electric current were applied 1961. GE developed the first working LED in 1962.

How LED works A LED is a semiconductor diode that consists of a chip of semiconducting material that creates a p-n junction. P-N junction is where current flows and it flows from the p-side to the n-side Charge-carriers - electrons and electron holes - flow into the junction releases energy in the form of a photon. The wavelength of the light emitted distinguishes LED’s color Examples of colors aluminum gallium arsenide (AlGaAs) - red and infrared aluminum gallium phosphide (AlGaP) - green aluminum gallium indium phosphide (AlGaInP) - high-brightness orange-red, orange, yellow, and green diamond (C) - ultraviolet

Uses of LED flash lights. LED Display Bicycle lights Traffic signs and signals Mouse for computers Cars (Lexus tailamp)

Advantages and Disadvantage Lasts longer than incandescent lights Extremely durable and less heat Lights up in microseconds High ambient temperature cause overheat. More efficient, lower power usage than incandescent lights.

References Whatis June 18 2001, Nov 9 2006 http://whatis.techtarget.com/definition/0,,sid9_gci213613,00.html Wikipedia Nov 9 2006, Nov 9 2006 http://en.wikipedia.org/wiki/LED_%28Light-emitting_diode%29#Physical_function