The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 05, 1986
Filed:
Mar. 01, 1983
Wolfgang Ruhle, Erlangen, DE;
Claus Weyrich, Gauting, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A light-emitting diode comprises III-V semiconductor material having a pn junction as its light-active zone from which luminescent radiation is emitted, the radiation having a pressure-dependent characteristic. The diode is characterized in that, for the purpose of pressure-dependent brightness of the light radiation, the composition of the light-active zone at the pn junction comprises a semiconductor material which has a composition which corresponds to a position close to the transition from a direct energy gap to an indirect energy gap and at which a change of the composition would result in a significant change in the brightness of the emission. The invention is particularly useful for potential-free measurement of pressure forces.