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Basic Overview of OLEDs

What is Organic EL (Electro Luminescence)?

Organic EL is the phenomenon of light emitted by organic materials to which a voltage has been applied. OLED (Organic Light Emitting Diode) stands for Organic EL. The emitting color varies depending on the molecular structure of the organic materials. OLEDs are expected to be used as next-generation displays and lighting. Because the thickness of organic materials is only a few hundred nanometers, OLED panels can be very thin.

Light emission principle

When a voltage is applied to OLED, the holes (positive electric charge) and the electrons (negative electric charge) are generated from each of the two electrodes.
When they recombine in the emissive layer, organic materials turn into a high energy state termed “excitation”.
The excess energy is released as light when the layer returns to its original stability, termed “ground state”.