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Semiconductor devices make good chemical sensors, being responsive, selective and compact. Some gas analytes, for example, can be photometrically detected by the electroluminescence they absorb from semiconductor light-emitting diodes2.3. Here we show that the intensity of this electroluminescence can be modulated in another way entirely, namely as a result of the adsorption of analytes onto the surface of the light-emitting diode, which affects its radiative efficiency by altering its surface- state structure and causes rapid, stable and reversible changes in electroluminescent intensity. Such devices are complementary to existing metal oxide-based resistance sensors, offering the advantages of low-power, room-temperature operation and ready integration into array-based devices.

Additional information

Authors: DESLYS J.P, CEA, Service de Neurovirologie, DRM/DSV, Fontenay-aux-Roses (FR);COMOY E, CEA, Service de Neurovirologie, DRM/DSV, Fontenay-aux-Roses (FR);HAWKINS S, Bio-Rad Life Sciences, California (US);WELLS G, Bio-Rad Life Sciences, California (US);SIMON S, Veterinary Laboratories Agency, Surrey (UK);GRASSI J, Veterinary Laboratories Agency, Surrey (UK);SCHIMMEL H, CEA, Service de Pharmacologie et d'Immunologie, DRM/DSV, Saclay (FR);MAYNAGH J, JRC, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: An article published in: Nature (2001), vol.409, pp.476-478
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