An OLED light panel is a planar emission device that makes use of the electroluminescent properties of organic semiconductor materials to produce visible light. The operation principle of OLEDs is similar to that of LEDs but the light-emitting layer takes the form of an organic stack, rather than an epitaxial layer of inorganic compound semiconductors. When a DC bias is applied to the electrodes (anode and cathode), the injected electrons and holes can recombine in the light-emitting layer to form excitons. The excitons can then radiatively decay (relax down into the ground state) and release their energy through the emission of photons at wavelengths in the visible portion of the electromagnetic spectrum. The process of emitting light through radiative recombination of charge carriers is referred to as electroluminescence. The wavelength of the light emitted by the organic emissive layer and the color of the light may depend on the band gap energy of the material, which is the difference in energy between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO).
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