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对ZnS:Mn,Cu粉末DCEL屏的形成过程及光电特性作了研究。观测到经形成的EL屏具有整流特性及相位开关效应,发光局限于阳极附近,EL屏具有光生伏特效应。随着形成电压的提高与形成时间的延续,EL屏的电容量由大变小,局部发光区(结区)也从阳极附近向体内迁移。上述实验结果表明:经形成EL屏的阳极附近存在势垒-Cu_xS-ZnS:Mn,Cu异质结。文中采用p-v-n结模型分析发光屏的导电机构及激发机制,指出发光区的迁移是EL屏退化的重要因素之一。 采用正弦电压(频率20Hz—20kHz)激励,观测EL屏的形成过程。初步认为,EL屏的形成与老化过程主要由热引起。因此,制备具有高度热稳定性的包铜ZnS粉末屏是十分重要的。
The formation process and photoelectric properties of ZnS: Mn, Cu powder DCEL screens were studied. It is observed that the formed EL panel has the rectifying property and the phase switching effect, the light emission is limited to the vicinity of the anode, and the EL panel has the photovoltaic effect. With the increase of the formation voltage and the formation time, the capacitance of the EL panel decreases from large to small, and the local luminescent region (junction region) also migrates from the vicinity of the anode to the body. The above experimental results show that there is a barrier-Cu_xS-ZnS: Mn, Cu heterojunction near the anode forming the EL panel. In this paper, the p-v-n junction model is used to analyze the conduction mechanism and the excitation mechanism of the luminescent screen. It is pointed out that the migration of luminescent region is one of the important factors of EL panel degradation. Using sinusoidal voltage (frequency 20Hz-20kHz) excitation, observation EL screen formation process. Preliminary view, the EL screen formation and aging process is mainly caused by heat. Therefore, it is very important to prepare Cu-ZnS powder screen with high thermal stability.