制造白光LED的新方法
文章来源: 文章作者: 发布时间:2006-09-04 08:47 字体: [ ]  进入论坛
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制造白光LED的新方法

Light from a blue light-emitting diode is converted into yellow light using phosphors. The resulting white light is produced quite efficiently1.

 

日本科学家利用新的萤光剂可以让LED发出接近日光的光谱。

发光二极体可以很有效的将电能转变成光。目前的技术可以很有效的制造出红光、绿光及蓝光的二极体。不过要让发光二极体来取代传统灯泡,那就必须让二极体能够发出像日光般的白光。

一般日光可以经由适当的混合红绿蓝三种颜色的色光来达到。所以科学家有试着利用混合红光绿光及蓝光二极体来发出白光。但是这个方法的问题是成本太高。所以科学家发明另外一种方法,就是在蓝光二极体中加入萤光剂来吸收蓝光并发出黄光。日本的National Institute for Materials Science及夏普公司利用Li–alpha-SiAlON:Eu2+这个萤光剂,可以把460nm的蓝光转换成573-577nm的黄光。他们得到的二极体每瓦的亮度为55流明,比市面上相同色度的发光二极体亮度高了一倍

A new LED design employs a handy combination of light and phosphors to produce light whose color spectrum2 is not so different from that of sunlight.

Light emitting diodes (LEDs) convert electricity into light very efficiently, and are increasingly the preferred design for niche3 applications like traffic and automobile4 brake lights. To really make an impression in the lighting5 world, however, a device must be able to produce room light. And to do this one needs a softer, whiter, more color balanced illumination.

The advent6 of blue-light LEDs, used in conjunction with red and green LEDs, helped a lot. But producing LED light efficiently at blue, red, and yellow wavelengths7 is still relatively8 expensive, and an alternative approach is to use phosphors to artificially achieve the desired balance, by turning blue into yellow light. Scientists at the National Institute for Materials Science and at the Sharp Corporation, in Japan, have now achieved a highly efficient, tunable9 white light with an improved yellow-producing phosphor . Their light yield is 55 lumens per watt10, about twice as bright as commercially available products operating in the same degree of whiteness.



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1 efficiently ZuTzXQ     
adv.高效率地,有能力地
参考例句:
  • The worker oils the machine to operate it more efficiently.工人给机器上油以使机器运转更有效。
  • Local authorities have to learn to allocate resources efficiently.地方政府必须学会有效地分配资源。
2 spectrum Trhy6     
n.谱,光谱,频谱;范围,幅度,系列
参考例句:
  • This is a kind of atomic spectrum.这是一种原子光谱。
  • We have known much of the constitution of the solar spectrum.关于太阳光谱的构成,我们已了解不少。
3 niche XGjxH     
n.壁龛;合适的职务(环境、位置等)
参考例句:
  • Madeleine placed it carefully in the rocky niche. 玛德琳小心翼翼地把它放在岩石壁龛里。
  • The really talented among women would always make their own niche.妇女中真正有才能的人总是各得其所。
4 automobile rP1yv     
n.汽车,机动车
参考例句:
  • He is repairing the brake lever of an automobile.他正在修理汽车的刹车杆。
  • The automobile slowed down to go around the curves in the road.汽车在路上转弯时放慢了速度。
5 lighting CpszPL     
n.照明,光线的明暗,舞台灯光
参考例句:
  • The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。
  • The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。
6 advent iKKyo     
n.(重要事件等的)到来,来临
参考例句:
  • Swallows come by groups at the advent of spring. 春天来临时燕子成群飞来。
  • The advent of the Euro will redefine Europe.欧元的出现将重新定义欧洲。
7 wavelengths 55c7c1db2849f4af018e7824d42c3ff2     
n.波长( wavelength的名词复数 );具有相同的/不同的思路;合拍;不合拍
参考例句:
  • I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话,因为我们俩完全不对路。 来自《简明英汉词典》
  • Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
8 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
9 tunable e846714832475261a7cdb5d8f2d1c687     
adj.可调的;可调谐
参考例句:
  • Researchers realised that a tunable laser beam might be useful in surgery. 研究人员意识到,可调谐激光束也许可以用在外科手术中。 来自辞典例句
  • The experiment of wavelength conversion using tunable external-cavity semiconductor laser is performed. 利用可调谐外腔半导体激光器进行了波长转换实验。 来自互联网
10 watt Lggwo     
n.瓦,瓦特
参考例句:
  • The invention of the engine is creditable to Watt.发动机的发明归功于瓦特。
  • The unit of power is watt.功率的单位是瓦特。
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