资源描述：
《学术英语演讲课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、TheresearchofefficientblueLED学生：庞彦红王鑫李帅魏铎垒TheresearchofefficientblueLEDPartOneThedevelopmentofLEDPartTwoPartThreePartFour庞彦红王鑫李帅魏铎垒ThefictionsofLEDThedevelopmentofLEDTheresearchofefficientblueLED庞彦红PartOneFrom1907itwasdiscoveredthatasemiconductormaterialcanshineafterpower,whichleadtobirthof
2、high-brightnessLEDlamp.TherapiddevelopmentofLEDlightingtechnology,hasbroughtgreatchangesfortopeople'slivesABOUTLEDTheIntroductionLEDdevelopment)1ONETWOTHREEThetypesofmonochromaticlightLEDanditsdevelopmenthistoryThedevelopmentofcompositelightLEDTherapiddevelopmentofthewhiteLED1Thetypesofmono
3、chromaticlightLED1ThetypesofmonochromaticlightLEDanditsdevelopmenthistoryTheearlymonochromaticlightLEDwasmadein1960s.whichonlyglowred.bythemid-70s,thatcanGreen,yelloew,andorange.intheearly80s,brighenessgreatlyenhanced22ThedevelopmentofcompositelightLEDTheLEDfromredtoblueLEDandLEDwhiteLEDthr
4、oughthreestages,redandgreenaremonochromatic(单色)LED.ThewhiteLEDappearedonthemarketin1998,markingacompositelightwhiteLEDwithwhite,thatpushedthedevelopmentofLEDlightingtoanewstartingpoint.ThedevelopmentofcompositelightLED(双色光LED)33TherapiddevelopmentofthewhiteLEDWithtechnologyadvancesinrecenty
5、ears,LEDdevelopedrapidlyandbeusedintheautomotivehighbeamsandotherhighbrightnessapplications.TherapiddevelopmentofthewhiteLED(复合光LED)PartTwoTheresearchofefficientblueLED王鑫ThefictionsofLED1.Smallsizeandlightweight2.Consumelessenergy3.Longlife4.GreenfirstSmallsizeandlightweightvariousdevicessc
6、reen:streetlamp:1secondConsumelessenergyVSReduce80%energycomsumption2ThirdLonglife60,000-100,000hours10timesaslongastraditionailights3AvoidfrenquentlampreplacementFourthnon-poisonousRecyclableGreen4李帅TheresearchofefficientblueLEDPartThree魏铎垒TheresearchofefficientblueLEDPartFourINOURDAILYLIF
7、EUSELIGHTINGGLASSMAKING1,saveenergy2,environmentprotection3,smallandpowerFIRST------AEROSPACE1,beautifulandcolorful2,energysaving=moneysaving3,highsafetySECOND------SKYSCRAPERclothesviewdecorationTHIRD------EXPANSIBILITYWestillhavealongwaytosearch.Ibelie
