PPT-LIGHT EMMITING DIODE(LED)

INTRODUCTION The Light Emitting Diode or LED as it is more commonly called is basically just a specialized type of diode as they have very similar electrical characteristics to a PN junction diode . 1 Introduction A light emitting diode LED is a device which converts electrical energy to light energy LEDs are preferred light sources for short distance local area optical fiber network because they are inexpensive robust and have long life the lon Two Types. Diode-Phototransistor Pair. Sharp Sensors. Sharp Sensor. Pros. Easy to use. Cons. Expensive. Large. Noisy readings. Diode-Phototransistor Pair. Pros. Cheap. Small. More accurate. Cons. Complex to manage. Optoelectronics. Optoelectronics. is the study and application of . electronic. devices that source, detect and control . light. , usually considered a sub-field of . photonics. .. Optoelectronic devices are . Introduction to Light Emitting Diode (LED) Principle of LED - p-n Homojunction Double Heterojunctions LED Materials - Direct and Indirect Band Gaps LED CircuitA light emitting diode (LED) is a device Clippers, Clampers, Voltage Multipliers and Displays. Diode Clippers. A clipper (or limiter) is a circuit used to eliminate some portion (or portions) of a waveform.. A series clipper is in series with its load.. A non-standard way to deal with . it. Assumes. . confidence. with. Basic . S. olid . S. tate . Physics. :. Crystals. Electrons. , . Holes. , . direct-indirect. Band Gap. Their. . foundation. on the . By: Grant Gorman and . alec. . pahl. 5/6/2013. Abstract: Light emitting diodes are semiconductor devices that emit light when a voltage . is places . across them. They have become increasingly popular in lighting applications because of their high efficiency and long lasting output. . Introduction. Aim . of Project. Diode stack inventory. Procurement of new parts. Complementary activities . on diodes. New diode . Lab in . Bd. 272. Coming steps. Conclusion. Giorgio on behalf of . M.Bednarek. Assistant Professor. Department of Electronics. St. Joseph’s College, . Trichy. . . What Are Diodes Made Out Of?. Silicon (Si) and Germanium (Ge) are the two most common single elements that are used to make Diodes. A compound that is commonly used is Gallium Arsenide (GaAs), especially in the case of LEDs because of it’s large bandgap. . Tunnel diode is one of the most significant solid-state electronic devices which is . heavily doped with impurities. , it exhibits . negative resistance. . which means the electric current across the tunnel diode decreases when the voltage increases. A . pn. junction is known as a . semi-conductor . or . crystal . diode. .. The outstanding property of a crystal diode to conduct current in . one direction . only permits it to be used as a rectifier. is a special type of device designed to operate in the . zener. breakdown region (. reverse breakdown region. ), The breakdown voltage of a . zener. diode is carefully set by controlling the doping level during manufacture. . Presented By Prof. D. M. Parshuramkar. N-Type Material. N-Type Material:. When extra valence electrons are introduced into a material such as silicon an n-type material is produced. The extra valence electrons are introduced by putting impurities or . 1. Recap. When a current-carrying . semiconductor or metal. is kept in a magnetic field, the charge carriers of the . semiconductor. experience a force in a direction perpendicular to both the magnetic field and the current. At equilibrium, a voltage appears at the .