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下载“第Ⅴ章:光半导体” (PDF:1.8MB)
发光二极管(LED)的发光原理是向化合物半导体的pn结施加正向电流。
当正向电流通过发光二极管时,载流子(电子和空穴)移动。p型区的空穴向n型区移动,n型区的电子向p型区移动。注入的载流子重组,重组前后的能量差将以光的形式释放出来。发射光取决于化合物半导体的能隙(Eg)。
(备注:传统的硅二极管不发光,因为重组能量变成了热能。)