论文部分内容阅读
本文报导ZnS—Ⅰ单晶的均匀(没有通常看到的那种亮点和线)击穿前场致发光。用欧姆接触加电压,当电压达到晶体内平均电场为≥10~2v/cm时,可以看到这种场致发光。单晶是用气体输运反应法制得的,接着在熔融锌中进行处理,在室温和液氮温度研究了光谱、电压—亮度、电流—电压(Ⅰ—Ⅴ)和随时间变化的特性。场致发光光谱除了宽的红带和兰带以外,还有个一紫外带,延伸到330nm。在用上升时间为0.2微秒的方脉冲电压激发时,场致发光亮度波形的前沿没有时间延迟。N形的伏安特性和电流及亮度发生振荡的事实表明,晶体中产生了可动的电子畴,它集中了电场,并可能是决定这种场致发光的特征的主要因素。从振荡周期计算出的电子畴的运动速度和ZnS中的声速一致。从这一事实可以设想,在场致发光时存在着声电不稳定性。
This article reports the homogenization of ZnS-I single crystals (no commonly seen bright spots and lines) before electroluminescence. With ohmic contact plus voltage, when the voltage reaches the crystal average electric field is ≥ 10 ~ 2v / cm, you can see this electroluminescence. Single crystals were prepared by gas transport reaction followed by treatment in molten zinc. Spectroscopy, voltage-brightness, current-voltage (I-V) and time-dependent properties were investigated at room temperature and at liquid nitrogen temperatures. Electroluminescence spectrum in addition to the wide red and blue band, there is a UV band, extending to 330nm. When excited with a square pulse with a rise time of 0.2 microseconds, the leading edge of the EL waveform has no time delay. The fact that the N-shaped volt-ampere characteristics oscillate with respect to current and brightness suggests that mobile electrons are generated in the crystal, which concentrate the electric field and may be a major factor in determining the characteristics of this electroluminescence. The moving speed of the electron domain calculated from the oscillation period coincides with the speed of sound in ZnS. From this fact, it is conceivable that there is electro-acoustic instability in electroluminescence.