学术英语演讲PPT培训课件.ppt

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1、学术英语演讲PPTThe development of LEDThe research of efficient blue LED庞彦红庞彦红Part OnePart OneFrom 1907 it was discovered that a semiconductor material can shine after power,which lead to birth of high-brightness LED lamp.The rapid development of LED lighting technology,has brought great changes for to peo

2、ples livesABOUT LED The Introduction LED development)1 ONE TWOTHREEThe types of monochromatic light LED and its development historyThe development of composite light LEDThe rapid development of the white LED1The types of monochromatic light LED 1The types of monochromatic light LED and its developme

3、nt history The early monochromatic light LED was made in 1960s.which only glow red.by the mid-70s,that can Green,yelloew,and orange.in the early 80s,brigheness greatly enhanced22The development of composite light LED The LED from red to blue LED and LED white LED through three stages,red and green a

4、re monochromatic(单色)LED.The white LED appeared on the market in 1998,marking a composite light white LED with white,that pushed the development of LED lighting to a new starting point.The development of composite light LED(双色光双色光LED)33The rapid development of the white LED With technology advances i

5、n recent years,LED developed rapidly and be used in the automotive high beams and other high brightness applications.The rapid development of the white LED(复合光复合光LED)Part TwoPart TwoThe research of efficient blue LED王鑫王鑫The fictions of LED1.Small size and light weight2.Consume less energy3.Long life

6、4.Green firstSmall size and light weightvarious devicesscreen:street lamp:1second Consume less energyVSReduce 80%energy comsumption2Third Long life60,000-100,000 hours10 times as long as traditionai lights3Avoid frenquent lamp replacementFourth non-poisonousRecyclableGreen4李帅李帅The research of effici

7、ent blue LEDPart ThreePart Three魏铎垒魏铎垒The research of efficient blue LEDPart FourPart FourIN OUR DAILY LIFE USE LIGHTING GLASS MAKING1,save energy2,environment protection3,small and power1,beautiful and colorful2,energy saving=money saving3,high safety clothes view decoration We still have a long way to search.I believe blue LED lights will lighten the 21st centary.Thank you for watching此课件下载可自行编辑修改，仅供参考！此课件下载可自行编辑修改，仅供参考！感谢您的支持，我们努力做得更好！谢谢感谢您的支持，我们努力做得更好！谢谢