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Working
Principle of OLED
OLED has a simple structure, which has an organic
light emitting layer between anodes and cathodes.
When a direct current is applied to the device, holes with positive
charges are injected from anodes and electrons with negative charges
are injected from cathodes into the organic light emitting layer.
Then, the organic molecules emit light when the positive hole
and the negative electron couple and generate energy in the organic
light emitting layer.
Because most of the organic materials are isolators and are difficult
to conduct current, organic light emitting layers need to have
very thin structures, approximately 0.1um.
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Device
Structure of OLED
The typical device structure of OLED is a laminated
anode (transparent electrode), a hole injection layer, a hole transport
layer, an emitting layer, an electron transport layer, an electron
injection layer and a cathode (metal electrode) on the glass substrate.
Each layer is stacked on the glass substrate using vacuum deposition
technology. Because organic materials are affected by oxygen and
moisture, OLED panels are encapsulated by sealing materials such
as metal or glass after being produced into layers on the glass
substrate. |
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