LED灯的发展简史(英文)课件.ppt

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1、ABriefHistoryofLED(LightEmittingDiode)1907In1907,BritishscientistHenryJ.Rounddiscoveredthephysicaleffectofelectroluminescence,anopticalandelectricalphenomenoninwhichamaterialemitslightinresponsetoanelectriccurrentpassedthroughitortoastrongelectricfield.Thelightproducedwasverydi

2、mandnotbrightenoughtostimulatefurtherresearch.1962In1962thefirstvisiblespectrumLEDlightwasproducedbyNickHolonyakJr.andwasredincolor.Thiscoinedhisnickname,'FatheroftheLightEmittingDiode'.TheredLEDswerenotbrightenoughtobeseenindaylightsothefirstLEDapplicationsweremainlyusedasindi

3、catorlightsformilitaryuse.1972M.GeorgeCraford,astudentofHolonyak,inventedthefirstyellowLEDin1972andthenwentontoproduceamuchbrighterredLED.1970'sAstechnologyprogressedinthe1970‘s,additionalcolorswerecreatedandasnewcolorsbecameavailable,newusesforLEDlightswereindemand.LEDswereuse

4、dinapplicationssuchascalculators,digitalwatchesandtestdevices.FirstElectronicCalculatorofTheWorldFirstDigitalWatchofTheWorld1980'sThefirstsuperbrightLEDsweredevelopedinthe1980'sandwerebrighter,morestableandcostefficient.ThedemandforLEDsrosedramatically.1990---From1990theuseofLE

5、Dsbecamestandardinvariousindustrialapplicationsfromswitchcabinetstomeasuringinstruments,inconsumerproductssuchasHiFiequipment,telephonesorpersonalcomputersandintrafficsignalinstallationsforroadandrailwayorinindoorandoutdoorautomotivelighting.FortwodecadesLEDlightshavebeenreplac

6、ingincandescentglobesinhomesandbusinesses,offeringacheaper,moreefficientserviceinawidevarietyofcontexts.OLED(OrganicLight-EmittingDiode)THANKYOU!