Bandwidth Dependency of (O)LEDs on Bias current
Bandwidth Dependency of (O)LEDs on Bias current
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DOI：
10.1109/wasowc49739.2020.9410027
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
A. Burton;P. Haigh;P. Chvojka;Zabih Ghassemlooy;S. Zvánovec
中科院分区：
文献类型：
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作者：
A. Burton;P. Haigh;P. Chvojka;Zabih Ghassemlooy;S. Zvánovec
本工作研究了有机和非有机发光二极管(OLED\LED)的调制带宽(Bmod)与外加偏置电流(IB)的关系。给出了两种器件的等效集总元件暂态电路模型，并从经验上提取了关键元件。除了四个高功率LED(白色荧光粉、红色、绿色和蓝色)外，还测试了四个不同大小的OLED。通过对电流-电压特性的分析，确定了器件和动态二极管的电阻以及理想系数。我们发现，OLED具有比传统LED更高的理想系数(几乎是传统LED的两倍)，从而增加了开启电压，但在器件发射部分具有类似的交流驱动电压特性，范围在8%-12%之间。此外，两种设备的Bmod都随着IB的增加而增加。结果表明，OLED的Bmod与IB呈线性关系，当≥达到其最大IB额定值的60%时，≥达到最大Bmod的80%。相反，LED显示出Bmod相对于IB的指数增长，在≥为其最大IB额定值的35%时，≥为最大Bmod的80%，而红色LED显示的结果最好，仅为17%。
This work investigates the modulation bandwidth (Bmod) dependency of organic and non-organic light emitting diodes (OLED\LED) on the applied bias current (IB). The equivalent lumped element transient circuit models are shown with the critical components empirically extracted for both types of device. Four OLEDs of varying sizes are tested in addition to four high power LEDs (white phosphor, red, green and blue). Through analysis of the current-voltage characteristics, the device and dynamic diode resistances are determined as well as the ideality factors. We show that OLEDs have higher ideality factors to the traditional LEDs (almost double) hence the increased turn-on voltage, however have similar AC drive voltage characteristics across the emitting portion of the device between 8–12%. Furthermore, both devices exhibit an increase in Bmod with an increase in IB. It is shown that the OLEDs Bmod increases linearly in relation to IB, reaching ≥80% of the maximal Bmod at ≥60% of their maximum IB rating. Conversely, the LEDs display an exponential rise in Bmod in relation to IB, with ≥80% of the maximal Bmod at ≥35% of their maximum IB rating, with the red LED showing the greatest results at just 17%.