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US 6,661,033 B2Granted
LED with a coupling-out structure
AssigneeOSRAM Opto Semiconductors GmbH
InventorsNorbert Linder, Ralph Wirth, Heribert Zull
Life of this patent
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Abstract
On an upper side there is a structured output coupling layer with flanks which are aligned at an angle between 60° and 88° with respect to a layer plane and which form boundaries for output coupling areas provided for the emergence of radiation and offset from one another. The output coupling areas are formed as flat truncated cones and can be rippled or zigzagged at the flanks, in order to increase the probability that the radiation produced strikes an outer interface of the output coupling layer more steeply than at a limiting angle of total reflection.
Claims9
An LED, comprising:
- a first layer electrically conductively doped with a first conductivity type;
- a second layer electrically conductively doped with a second conductivity type being opposite to said first conductivity type;
- an active layer provided for radiation production disposed between said first and second layers, said active layer, said first layer and said second layer defining a layer sequence having an upper surface;
- an output coupling layer disposed on said upper surface and provided for emergence of the radiation, said output coupling layer having and bounded by lateral flanks defining at least two output coupling areas corresponding to mutually offset proportions of said output coupling layer, an angle formed between said lateral flanks and a plane of said output coupling layer lying between 45° and 88°;
- and
- two contacts, including a first contact disposed on said output coupling layer and a second contact disposed on said layer sequence, providing electrical connections.
3 more elements
Dependencies are inferred from the claim text.