Lowering the driving voltage and improving the luminance of blue fluorescent organic light-emitting devices by thermal annealing a hole injection layer of pentacene

We chose pentacene as a hole injection layer (HIL) to fabricate the high performance blue fluorescent organic light-emitting devices (OLEDs). We found that the carrier mobility of the pentacene thin films could be efficiently improved after a critical annealing at temperature 120 °C. Then we performed the tests of scanning electron microscopy, atomic force microscopy, and Kelvin probe to explore the effect of annealing on the pentacene films. The pentacene film exhibited a more crystalline form with better continuities and smoothness after annealing. The optimal device with 120 ℃ annealed pentacene film and n-doped electron transport layer (ETL) presents a low turn-on voltage of 2.6 V and a highest luminance of 134800 cd/m² at 12 V, which are reduced by 26% and improved by 50% compared with those of the control device.     

基于单T网络的忆阻混沌电路

利用RC单T选频网络构成的正弦波振荡电路和三次光滑模型忆阻器,通过不同的耦合方式,设计了并联型和串联型忆阻混沌电路.通过分岔图、Lyapunov指数和相图分析了电路的基本动力学特性,观察到了当耦合电容值变化时电路呈现的倍周期分岔、周期窗口和快慢效应等复杂动力学行为.电路仿真得到的实验结果与数值计算结果基本一致.