* Question
| Please briefly explain the illuminating process of 0LED? |
* Answer
| (1) Carrier injection.Appropriate forward bias is applied to the device. After electrons and holes overcome the interface energy barrier, electrons are injected through the cathode and anode. The electrons are injected into the lowest unoccupied orbital level of the electron transport layer by the low work function metal cathode.The gap of the transparent ITO film is implanted into the highest occupied orbital level of the hole transport layer.The excitons transfer energy to the organic luminescent molecules and excite the electrons of the organic luminescent molecules from the ground state to the excited state.(5) Electroluminescence.Excited state electron radiation is deactivated, producing photons, releasing energy back to a stable ground state. |
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