Optical sensor element

Details Optical sensor element Optical sensor element

G - Physics

01

D

345/11, 73/51.5

G01D 5/26 (2006.01) G01K 11/20 (2006.01) G01L 1/24 (2006.01) G01L 11/02 (2006.01) G02F 1/015 (2006.01) H01L 31/10 (2006.01)

Patent

CA 1188397

ABSTRACT OF THE DISCLOSURE: The invention relates to a sensor element formed of a crystalline material and which emits reproducible luminescence spectra in response to excitation light spectra. Such a sensor element comprises a first layer of semi- conductor material emitting the reproducible luminescence spectra upon excitation by the excitation light spectra and doped with materials providing shallow energy levels and recombination centers. This first layer has a dopant concentration between 1015 to 1018/cm3. The sensor element further comprises at least second and third layers of semiconductor material surrounding the first layer and having low absorption for the excitation light and lumi- nescent light of this first layer. The second and third semiconductor layers have respective lattice constants substantially coinciding with that of the first layer and each semiconductor layer has a same type of majority charge carriers.

386818

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