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:
Jan. 10, 1995
Filed:
May. 20, 1994
Adriaan Valster, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Radiation-emitting semiconductor diodes in the form of a laser diode or in the form of an LED form important components in data-processing systems. There is a particular need for diodes which emit in the visible part of the spectrum, which have a low starting current and which can be manufactured at low cost. A radiation-emitting semiconductor diode comprising above the active layer a cladding layer and a GaAs contact layer, into which a mesa-shaped strip is etched, and provided on the upper and the lower side with a conductive layer, which forms outside the mesa-shaped strip a junction forming a barrier with a subjacent semiconductor layer, partly satisfies the aforementioned requirements. Such a diode may further advantageously include an active layer and cladding layers, which contain (Al) GaInP, and an intermediate layer between the cladding layer and the contact layer, which extends outside the mesa-shaped strip and forms at these areas current-limiting regions due to the junction forming a barrier with the conducting layer. This intermediate layer offers the possibility to optimize the barrier effect, independent of the properties of the remaining semiconductor layers. The intermediate layer can include InGaP, InAlGaP or AlGaAs.