Light extraction using feature size and shape control in LED surface roughening
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United States of America Patent
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Nov 6, 2018
Grant Date -
Nov 10, 2016
app pub date -
Jul 21, 2016
filing date -
Jun 1, 2012
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Abstract
The structural characteristics of the light-exiting surface of a light emitting device are controlled so as to increase the light extraction efficiency of that surface when the surface is roughened. A light emitting surface comprising layers of materials with different durability to the roughening process exhibits a higher light extraction efficiency than a substantially uniform light emitting surface exposed to the same roughening process. In a GaN-type light emitting device, a thin layer of AlGaN material on or near the light-exiting surface creates sharper features after etching compared to the features created by conventional etching of a surface comprising only GaN material.
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