Method for controlling color contrast of a multi-wavelength light-emitting diode
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United States of America Patent
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Jan 25, 2011
Grant Date -
Feb 14, 2008
app pub date -
Jun 26, 2007
filing date -
Nov 8, 2006
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Expired
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Abstract
A method for controlling the color contrast of a multi-wavelength light-emitting diode (LED) made according to the present invention is disclosed. The present invention includes at least the step of increasing the junction temperature of a multi-quantum-well LED, such that holes are distributed in a deeper quantum-well layer of the LED to increase luminous intensity of the deeper quantum-well layer, thereby controlling the relative intensity ratios of the multiple wavelengths emitted by the LED. The step of increasing junction temperature of the multi-quantum-well LED is achieved either by controlling resistance through modulating thickness of a p-type electrode layer of the LED or by modifying the mesa area size to control its relative heat radiation surface area.
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