Later，Holonyak started 1ooking into how semiconductors could be used to generate 1ight.But while his colleagues were 1ooking at how to generate invisible light，he wanted to generate visible light.The LEDS he invented in 1962 now last about 10 times longer than incandescent bulbs，and are more environmentally friendly and cost effective.

　　Holonyak，now a professor of electrical and computer engineering and physics at the University of Illinois，said he suspected that LEDs would become as commonplace as they are today，but didnt realize how many uses they would have.

　　You dont know in the beginning.YOU think youre doing something important.you think its worth doing，but you really cant tell what the big payoff is going to be，and when，and how.You just dont know，he said.

　　The Lemelson.MIT Program also recognized Edith Flanigen，75，with the$1 00，000

　　Lemelson-MIT Lifetime Achievement Award for her work on a new generation ofmolecular sieves，that can separate molecules by size.

　　词汇：

　　semiconductor n.半导体

　　alloy n.合金

　　diode n.二极管

　　incandescent adj.白炽的

　　bulb n.灯泡

　　commonplace adj.普通的

　　molecular adj.分子的

　　sieve n.筛

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