西门子公司曾用SiC做成的PN结来制备蓝色发光二极管。此工艺先在西德汉诺威工业大学进行研究,系采用一种特殊的掺杂方法来获得蓝色光发射。然而,批量生产这种二极管的最大障碍是缺乏作为衬底材料所要求的大面积的SiC单晶。市场上何时出售这种二极管,尚难预测。 Siemens made a blue light-emitting diode using a PN junction made of SiC. The process was first studied at the Hanover University of Technology in West Germany using a special doping method to obtain blue light emission. However, the biggest obstacle to mass-producing such diodes is the lack of a large area of ​​SiC single crystal required as a substrate material. When to sell the diode in the market, it is hard to predict.