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一、引言 众所熟知的一些结型发光器件是PN,MIS及MS结等,这些器件的发光光谱都是由半导体材料性质决定的,所以一种器件一般说只能发出一种颜色的光谱。对于直接跃迁型Ⅲ—Ⅴ族发光材料,例如GaAs_(0.6)P_(0.4)的PN结发光二极管,发光光谱取决于禁带宽度,所以只能发出红光;而直接带的Ⅱ-Ⅵ族材料,例如ZnSe:Mn肖特基二极管在反向偏压下的发光则利用杂质中心Mn的发光,只能得到黄色。目前人们已成功地制得了红色GaAsP,GaP、GaAlA以及黄色和绿色的GaP发光二极管。但这类器件的光谱并不随外加电压改变。为了得到兰色
I. INTRODUCTION It is well-known that some junction type light-emitting devices are PN, MIS and MS junctions. The luminescence spectra of these devices are determined by the nature of the semiconductor material. Therefore, a device generally emits only one color spectrum. For direct transition type III-V luminescent materials, such as PN junction LEDs with GaAs_ (0.6) P_ (0.4), the luminescence spectrum depends on the forbidden band width and therefore only emits red light; whereas the direct band II-VI materials, For example, the ZnSe: Mn Schottky diode in the reverse bias of the light emission is the use of impurity Mn center of light, can only get yellow. Currently, red GaAsP, GaP, GaAlA and yellow and green GaP LEDs have been successfully fabricated. However, the spectrum of such devices does not change with the applied voltage. In order to get blue