Transient Electroluminescence Measurement on Organic Light-Emitting Diodes (OLED) of Mutilayer Electron-Injection Structure

The influence of electron-injection structure of cesium carbonate/silver nanocluster/cesium carbonate (CSC) is investigated in this study. The silver nanoclusters (SNCs) are introduced between the cesium carbonate electron-injection layers. When the CSC electron-injection structure replaces the cesium carbonate electron-injection layer of the single layer, the shorter response time and rising time are obtained by measuring transient electroluminescence. In addition, the maximum luminance for the device with CSC electron-injection structure is enhanced by 93% compared with that of the device with cesium carbonate electron-injection layer of the single layer because the electron-injection barrier between the cathode and the electron-transporting layer can be remarkably reduced. Moreover, the localized electric field around the SNCs is enhanced, resulting in an increase in electron injection from the cathode electrode.