Method for enhancing electrical injection efficiency and light extraction efficiency of light-emitting devices
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United States of America Patent
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Aug 20, 2013
Grant Date -
Jun 2, 2011
app pub date -
Dec 2, 2009
filing date -
Dec 2, 2009
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Abstract
A method for enhancing electrical injection efficiency and light extraction efficiency of a light-emitting device is disclosed. The method includes the steps of: providing a site layer on the light-emitting device; placing a protection layer on the site layer; forming a cavity through the protection layer and the site layer; and growing a window layer in the cavity. The shape of the window layer can be well controlled by adjusting reactive temperature, reactive time, and N2/H2 concentration ratio of atmosphere such that light escape angle of the window layer can be changed.
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