| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-emitting device, system, and an operational method which enables the achievement of a longer device lifetime.SOLUTION: A light-emitting device comprises: a first electrode 11; a second electrode 12; and a light-emitting active material 13 contacting and separating the first and second electrodes. The device further comprises: a combination of a conjugated polymer and an electrolyte. The electrolyte includes ions, which enables the electrochemical doping of the conjugated polymer. In the device, A ratio between the ions and the conjugated polymer is selected to allow for the formation of: (i)a doped region at each electrode interface; and (ii)an effectively undoped region separating the doped regions. The ratio between the ions and the conjugated polymer is low enough for the undoped region to remain effectively undoped and free from the ions, as substantially all ions in the active material are locked up in the doped regions.SELECTED DRAWING: Figure 3 |
