One version of these devices uses a polymer of p-phenylene vinylene deposited into a thin film, while others can use tris(8-hydroxy-quinolinato)-aluminum with tryphenylamine transport layers. Common materials used to create t
One version of these devices uses a polymer of p-phenylene vinylene deposited into a thin film, while others can use tris(8-hydroxy-quinolinato)-aluminum with tryphenylamine transport layers. Common materials used to create these devices include Indium gallium nitride and gallium arsenide phosphide built upon sapphire substrates, and some versions of these devices can be coated with (*) phosphor to alter their properties. Those aforementioned organic ones have large numbers of conjugated pi bonds. These devices necessary have direct bandgaps rather than indirect ones, because materials with indirect bandgaps have fast, non-radiative transitions. The emitted wavelength is proportional to the bandgap energy. For 10 points, name this type of diode that fires visible photons.
One version of these devices uses a polymer of p-phenylene vinylene deposited into a thin film, while others can use tris(8-hydroxy-quinolinato)-aluminum with tryphenylamine transport layers.
{Light}-{emitting Diodes} [or {LEDs}]