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February 7, 2001
Technical Principles of the Organic Electroluminescence (OEL) Display
OEL device and the light emission principle
Organic EL substrate is characterized by its simple physical structure where the organic film is sandwiched between a cathode and an anode.When direct electric current is run through this device, the cathode releases an electron and the anode releases a hole* into the organic film.Within the organic film, the electron and the hole recombinate, thereby releasing energy that excites the organic material.This excitation emits light in the color which is characterized by the organic material. In order for the light to emit outward, either the cathode or the anode must be made transparent or translucent.
*hole:vacancy of an electron that behaves like a positive particle
Characteristics of the OEL Display