Through specific selection of the semiconductor materials and the endowment, the characteristics of the produced light can be varied. Especially the spectral segment (in the visible segment this corresponds to the color) and the efficiency can be controlled this way:







  • aluminum-gallium-arsenide (AlGaAs) – red and infrared, max. wavelength 1,000nm
  • gallium-aluminum-arsenide (GaAlAs) – e.g. 665 nm: red, max. wavelength 1,000nm
  • gallium-arsenide-phosphide (GaAsP) and aluminum-indium-gallium-phosphide (AlInGaP) – red, orange and yellow
  • gallium-phosphide (GaP) – green\r\n* silicone-carbide (SiC) – the first commercial blue LED; low efficiency
  • indium-gallium-nitride (InGaN)/gallium-nitride (GaN) – UV, blue and green
  • white LEDs are in most of the cases blue LEDs with a phosphoric layer operating as luminescence converter (see: White LED)