Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – In combination with or also constituting light responsive...
Reexamination Certificate
2006-06-28
2008-12-30
Louie, Wai-Sing (Department: 2814)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
In combination with or also constituting light responsive...
C257SE33016
Reexamination Certificate
active
07470934
ABSTRACT:
In a radiation-emitting optoelectronic semiconductor chip comprising an active layer (3) at least one p-doped layer (9) and a layer sequence (8) comprising a plurality of undoped layers (4, 5, 6, 7), which is arranged between the active layer (3) and the p-doped layer (9) and contains at least a first undoped layer (5) and a second undoped layer (6), the second undoped layer adjoining the first undoped layer (5) and succeeding the first undoped layer (5) as seen from the active layer (3), the first undoped layer (5) and the second undoped layer (6) in each case contain aluminum, the aluminum proportion being greater in the first undoped layer (5) than in the second undoped layer (6). The layer sequence (8) advantageously acts as a diffusion barrier for the dopant of the p-doped layer.
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Cohen Pontani Lieberman & Pavane LLP
Jahan Bilkis
Louie Wai-Sing
Osram Opto Semiconductors GmbH
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