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发光二极管是一种较新颖的半导体器件。它不但具有一般晶体二极管的单向导电性能,而且在正向电压的作用下,会发出优美的形色光来。它的工作电流小。常用的发光二极管有磷化镓红色发光二极管和磷砷化镓红色发光二极管,还有发绿光发黄光的,用发光二极管可作如下的两个物理演示实验: 一、晶体二极管的单向导电性取一只发红光的磷化镓发光二极管LED,一只30Ω限流电阻,3 V直流电源。连接如图一电路。当把LED的正极(标记为外壳上有尖角)接A端,负极接B端,合上开关K,则LED发出显亮的红色光来,再把LED的正负极
Light-emitting diodes are a relatively new type of semiconductor device. It not only has the unidirectional conductivity of the general crystal diode, but also emits beautiful shaped light under the action of the forward voltage. It's working current is small. Commonly used light-emitting diodes gallium phosphide gallium red and red light-emitting diodes gallium arsenide, as well as green hair yellow, light-emitting diodes can be used for the following two physical demonstration experiments: First, the crystal diode unidirectional Electrical Take a glowing gallium phosphide LED, a 30Ω current limiting resistor, 3 V DC power supply. Connect a circuit as shown in Figure. When the LED's positive (marked with a sharp angle on the shell) then A terminal, the negative terminal B, close the switch K, the LED emits a bright red light, and then the positive and negative LED