| 초록 |
To achieve highly efficient OLEDs, continuous stacking of multiple functional layers (e.g. hole injeciton layer and electron injection layer) is critical. The structure however complicates the fabrications process of flexible OLEDs through solution processes. LECs (light emitting electrochemical cells) can be an alternative device structure that require only a single active layer (a blend of electrolyte, light emissive material, and additives) for efficient charge injection for operation. Due to the using of electrochemcial processes, galvanostatic operation (current-driven method) rather than potentiostatic operation (voltage-driven method) should yield more stable and reliable device operation. In this paper, we systematically investigate how the current-driving methods (driving current density, driving frequency, or duty-cycle) affects the polymer LEC operation, towards attaining stable and long-lived PLEC with low internal voltage. |
