Organic light-emitting electrochemical cells (oLECs) are very promising candidates for future applications in low cost and low power consuming full colour flat panel displays. Different from conventional polymer light-emitting diodes (pLEDs), in oLECs the conjugated polymer is blended with a solid-state electrolyte, forming a mixed ionic electronic conductor. The mode of operation of these devices uses the ionic species of the solid-state electrolyte in order to enhance the electronic properties of the conjugated polymer by electrochemical doping processes. The result is an in-siru formation of p-type and n-type doped interfacial layers of the conjugated polymer with the anode and cathode materials, separated by a non-doped region of the conjugated polymer. Thereby, a so called organic p-i-n-junction structure is established.
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