Patent ID: 8188485

Claim:
A detection system comprising: a light emitting diode (LED) comprising at least one (semi)conductive electroluminescent active layer comprising at least one electroluminescent organic compound, which at least one electroluminescent organic compound provides for the simultaneous emission of at least two intensity maxima of different wavelengths of light, the simultaneous emission further comprising a reference signal comprising light emitted at a wavelength corresponding to one of the at least two intensity maxima and a detection signal comprising light emitted at a wavelength corresponding to another of the at least two intensity maxima; and a detector comprising a signal channel configured to detect the detection signal and a separate reference channel configured to simultaneously detect the reference signal in optical communication with the LED, wherein the at least two different intensity maxima of the different wavelengths are emitted by a first and a second organic electroluminescent compound, wherein the first organic electroluminescent compound has a maximum in the emission spectrum at a different wavelength than the second compound.