METHOD FOR COATING PHOSPHOR, APPARATUS TO PERFORM THE METHOD, AND LIGHT EMITTING DIODE COMPRISING PHOSPHOR COATING LAYER
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United States of America Patent
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app pub date -
Feb 8, 2013
filing date -
Mar 26, 2008
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Abandoned
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Abstract
A method of forming a phosphor coating layer on a light emitting diode (LED) chip using electrophoresis includes separating phosphor particles in a suspension according to a particle size, and coating the phosphor particles on a surface of the LED chip by sequentially depositing the separated phosphor particles on the surface of the LED chip according to the particle size. An apparatus to form a phosphor coating layer on an LED chip includes an electrophoresis bath to accommodate a suspension containing phosphor particles separated into layers according to a particle size, and electrodes disposed inside the electrophoresis bath. The electrodes may include a cathode electrode on which the LED chip may be arranged, and an anode electrode.
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