= Organic light-emitting diode
An <organic light-emitting diode> produces <light> when injected <electrons> and <electron holes> recombine in an organic emitting layer. Contacts and transport layers bring the two charge-carrier types together; radiative relaxation of the resulting excited states supplies the emitted <photons>. The device is emissive, so an individual display pixel can generate its own <light>.
The 1987 two-layer device used an <indium tin oxide> anode, an organic hole-transport layer, an aluminum-chelate emitting layer and a magnesium-silver cathode. Electrode choice and the organic interface confined recombination to the emitting region. Measuring current and escaping <light> separately distinguished charge injection from useful optical output.<Organic electroluminescent diodes by C. W. Tang and S. A. VanSlyke>[Figure 1 and apparatus description, printed page 913]{ref}
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