Equivalent Circuits and Efficacy of Single-Layer ACPEL Devices

Equivalent Circuits and Efficacy of Single-Layer ACPEL Devices
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单层 ACPEL 器件的等效电路和功效

DOI:
10.1149/2.015406jss
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发表时间:
2014
影响因子:
2.2
通讯作者:
Winscom C
Winscom C
中科院分区:
材料科学4区
文献类型:
--
作者:
Winscom C

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本文用串联电阻-电容等效电路来描述单层交流粉末电致发光(ACPEL)灯的工作状态。该实际等效电路的两个关键组成部分是频率和电压相关的,并且已经在50-800 Hz和10-150 V的范围内针对单层ACPEL器件独立地确定。含有铁电组分的有机粘合剂主要负责确定电容元件,因为它与主要来自磷光体的较大电容贡献串联作用。串联电阻元件将主要由磷光体颗粒决定,并且示出灯结构的有效串联电阻和电容的显著变化是由ZnS磷光体的激活所带来的。的有效电阻是一致的模型,其中电导率是由给定的内部场和频率条件下的平均电荷复合时间。利用等效电路的有效电阻和电容值,可以很容易地计算出能量耗散的平均速率作为施加电压和频率的函数。对于正弦波形,第一个迹象是在低电压下将优化功效,但仅微弱地依赖于频率。
A series resistance–capacitance equivalent circuit has been used to describe a single layer AC Powder Electroluminescence (ACPEL) lamp in operation. The two crucial components of this practical equivalent circuit are frequency and voltage dependent and have been independently determined for a single layer ACPEL device over a range of 50–800 Hz and 10–150 V. The organic binder containing a ferroelectric component is mainly responsible for determining the capacitive element since it acts in series with a larger capacitative contribution mainly from the phosphor. The series resistive element will be determined by mainly the phosphor particles, and the remarkable changes in the effective series resistance and capacitance of the lamp structure are shown to be brought about by the activation of the ZnS phosphor. The effective resistance is consistent with a model where conductivity is governed by the average charge recombination time under given internal field and frequency conditions. Using the effective resistance and capacitance values of our equivalent circuit, the average rate of energy dissipation can be easily calculated as a function of applied voltage and frequency. For sinusoidal waveforms, first indications are that efficacy will be optimized at low voltages, but only weakly dependent on frequency.
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