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本文研究了粉末直流电致发光(DCEL)器件在直流(DC)和交流(AC)电压下光电特性的关联和区别及其物理机制. 实验发现,在DC和AC条件下DCEL器件的阻抗特性之间没有任何有规律的关联,而AC条件下的激发电流I_A和亮度B_A以及DC条件下的亮度B_D和发光效率η_D四个参量之间则表现出某种程度的一致性,但AC条件下的发光效率η_A与上述四个参量之间却表现出某种相反和相对立的关系. DCEL器件的光电特性具有强烈非线性和对电压方向的非对称性.正半周(或DC条件下)DCEL器件是在高电场和低电流激发下的发光.对发光起主要作用的是电场强度.在负半周时则是低电场和大电流激发下的发光.对发光起主要作用的是激发电流而不是电场强度.在AC条件下依材料、工艺、形成条件和工作电压的不同,DCEL器件可能更多地显示出正半周,负半周或两半周综合的光电特性.上述观点可以解释本文的实验结果.
In this paper, the relationship and difference of photovoltaic characteristics between DC and AC voltage and the physical mechanism of DCEL device were studied.The experimental results show that the DCEL device’s impedance characteristics under DC and AC conditions There is no regular correlation between the AC conditions, the excitation current I_A and brightness B_A and the DC conditions of the brightness B_D and luminous efficiency η_D four parameters showed some degree of consistency, but the AC conditions of the light Efficiency η_A and the above four parameters show a certain opposite and opposite relationship between the photoelectric properties of DCEL devices with strong non-linear and voltage direction of asymmetry. Positive half-cycle (or DC conditions) DCEL device is The luminescence under high electric field and low current excitation The main effect on luminescence is the electric field intensity and in the negative half cycle luminescence under low electric field and high current excitation The main effect on luminescence is the excitation current rather than the electric field intensity . Under AC conditions, depending on material, process, formation conditions, and operating voltage, DCEL devices may show more of a positive half-cycle, negative half cycle, or two weeks of combined optoelectronic characteristics. Experimental results.