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荷兰埃因霍温的菲利浦公司基于单异质结镓铝砷化物技术,推出自称为世界第一的红外LED和光电耦合器。该异质结含有两个外延层:上面一层为掺碲的N型注入层;下面一层是掺锌的P型注入层,辐射从这两外延层中产生。据菲利浦公司宣称:注入层比激活层多含30%的铝,因而注入效率较高。该器件的波长可以通过改变激活层的铝含量来改变。目前计划生产两种器件:波长为830nm的器件可与标准的光电二极管和三极管配用;波长为740nm的器件可与集成光电接收机配用。这两种器件是用来取
Phillips, based in Eindhoven, the Netherlands, has introduced itself as the world’s first infrared LED and optocoupler based on single-heterojunction gallium-aluminum-arsenide technology. The heterojunction includes two epitaxial layers: the upper layer is an N-type implant layer doped with tellurium; the lower layer is a P-type doped layer doped with zinc, and radiation is generated from the two epitaxial layers. According to Philips, the company claims that the injection layer is 30% more aluminum than the activation layer and therefore has a higher injection efficiency. The wavelength of the device can be changed by changing the aluminum content of the active layer. Two devices are currently planned for production: devices with a wavelength of 830nm can be used with standard photodiodes and transistors; devices with a wavelength of 740nm can be used with integrated optoelectronic receivers. These two devices are used to take