Question

Explain the principle of OLED in 5 steps.

Answer 1

1. OLED compsed of emmisive layer, a conductive layer, a substrate, cathode and anode terminals.

2. Voltage is applied accross the OLED, so anode is positive with respect to the cathode

3. Leads to flow of electrons through the device from cathode to anode.

4. So Cathode gives electrons to the emissive layer and the anode takes electrons from conductive layer viceversa to holes

5. The emissive layer becomes negatively charged, while the conductive layer becomes rich in positively charged holes. Electrostatic forces bring the electrons and the holes towards each other and they recombine.