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§1 前言 电致发光元件的研究,直到现在还没有达到当初所期望的较大的进展,特别是对于Ⅱ—Ⅳ族化合场ZnS的EL进行了深入的研究,但在应用上还存在亮度,寿命等问题。ZnS系半导体作为可见发光材料,具有很多物理和化学特征,并且容易偏离化学比,所以不用说发光的理论研究,就是在说明是否发光的单纯现象方面,也是非常困难的。电致发光元件的分类有几种,按电压可分为直流EL和交流EL。交流EL本质是激发和发光过程间有半周期的延迟,更确切地说是指steinberger等人的学说所表示的现象,为方便起见,我们认为它是指加交流电压时发光的场合。
§1 Introduction Electroluminescent devices, until now have not yet achieved the desired initial large progress, especially for the Ⅱ-Ⅳ group of the field of ZnS EL conducted an in-depth study, but there are still applications of brightness, Life expectancy and other issues. As a visible light-emitting material, the ZnS-based semiconductor has many physical and chemical characteristics and easily deviates from the chemical ratio. Therefore, it is very difficult to study the theory of light emission, that is, to explain simple phenomenon of light emission. There are several types of electroluminescent devices, according to the voltage can be divided into DC and AC EL EL. The essence of alternating current EL is the half-cycle delay between the excitation and the light emission, and more precisely the phenomenon represented by the doctrine of Steinberger et al. For convenience, we think it refers to the light-emitting situation when AC voltage is applied.