資源描述：
《LED燈的發(fā)展簡(jiǎn)史(英文)課件.ppt》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
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!
