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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) are devices that employ this phenomenon. 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 it is available in a range of colors, shapes and sizes, it provides a greater degree of flexibility in the design for various space and application.

Light emission principle

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

  • Light emission principle

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