Light emitting diode’s a Basic Description of LED Bulbs...
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Transcript of Light emitting diode’s a Basic Description of LED Bulbs...
led lights are efficient
Light Emitting Diodes ( l.e.dS )This Presentation is based on The Light Emitting Source..
Enlightening yours Life
CONTENTS..HistoryWhy its Implemented : Adverse Effect on EnvironmentIntroductionBasic Working PrincipleTypes Of ledConstruction of LedAnatomy Of LedLed DistributionConstruction Details & StructureLed Product & RangeComparisonsProposals & ConclusionApplicationsFuture TechnologyThanks' & Quires
HistoryIn 1962, when Nick Holonyak Jr. invented first visible led, emitting red light but they are not enough to illuminate surroundings.Hence used as Indicators, Seven segment displays like(calculators, watches, t.v, telephones etc..)By mid 1970s,more colors green, yellow were manufactured It got somewhat succeeded with improved efficiency.In early 1980s LED were being used for messages and other outdoor applications. They used less power and were ten times brighter than previous ones.By early 1990s High brightness LED packages were developed and were widespread used in Traffic lights.
Need to implement: EFFECT OF MERCURY ON THE ENVIRONMENT
One teaspoon of mercury can contaminate a 20 acre lake.
introduction
It is a semiconductor device that emits light when a current is passed through it.Instead of a filament they use a semiconductor diode which emits narrow-spectrum light.Depending on the composition & condition of the semiconducting material used (Silicone, germanium), they come in either Infrared for sensing heat, Visible for every day use, or Near-Ultraviolet for spotting stains at a crime-scene.LED consists of a chip of semiconducting material that has been doped with impurities in order to create a p-n junction.The wavelength and color of the LED depends on the band-gap energy of the materials forming the p-n junction.
Basic working principleWhen a PN junction diode is forward biased, the electrons and holes move in opposite directions.During this free movement, an electron may fall into hole releasing some energy.This energy is in the form photon and hence light is emitted.This phenomenon is termed as Electroluminescence.
TYPES OF LED
1. DIP LED 1. SMD LED
DIP LED(Dual Inline Packed) 2. SMD LED (Surface-Mounted-Device)CONSTRUCTIONAL DETAILS
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DETAILS:-LENSO-RINGSCREWSLEDSMC PCBHEAT SINKO-RINGPLUG HOLDERREPLACABLE PLUGCONSTRUCTION DETAILS:-
STRUCTURE OF AN LED BULB
Panels and down lights
T8 Retrofit Tubes and Fittings
High efficiency high bay fittingsFlood Lights for domestic and commercial applications
LED Surface Luminaires LED Product Range
A Comparison Between LED Lighting, Incandescent light Bulb and CFL
Carbon Dioxide Emissions (30 bulbs per year)
4500 pounds/year
451 pounds/yearClear Winner LED1051 pounds/year
1515
PROS AND CONS OF LED BULBSPROSInstant light without flickering4 times longer life time than CFL Not contains mercury and other hazardous materials so it can be recycle Very energy efficientCONSCostlier than ordinary bulbsThey are vulnerable to high temperature
applications
FUTURE TECHNOLOGIESOLED (Organic LED)Self powered LED bulbLED light can use as an alternative for wifi
This whole Presentation is Presented by:-Abhishek JangidElectrical Eng. (Final Year Std.)Roll No.:-12EAXEE702