Chen Jiangshan

High Current Transfer Ratio Organic Optocoupler Based on Tandem Organic Light-Emitting Diode as the Input Unit

An organic optocoupler (OOC) is fabricated with a tandem organic light-emitting diode (OLED) as the light source (input unit) and an organic photodiode (OPD) as the detector (output unit). It is found that using the tandem OLED as the input unit can significantly increase the current transfer ratio of the organic optocoupler. When the tandem OLED operates under 8 V and the OPD operates under −4 V, the current transfer ratio of the optocoupler reaches 5.4%. Simultaneously, the ION/IOFF ratio of the optocoupler reaches 105, which can be attributed to the small leakage current of the OPD, and the high efficiency of the OPD and the tandem OLED.

Nonvolatile Memory Devices Based on Gold Nanoparticle and Poly (N-Vinylcarbazole) Composite

A rewritable polymer memory device based on gold nanoparticle doped poly (N-vinylcarbazole) (PVK), which can be easily fabricated by simple spin coating, has been described. An electrical bistable phenomenon is observed in the current-voltage characteristics of this device, and it is found that the electrical bistability is repeatable by proper writing voltage and erasing voltage. The unique behaviour of the devices provides an interesting approach such that doping nanoparticles in polymer can be used to realize high performance nonvolatile polymer memory devices.