Color yield of white LEDs
First Claim
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1. A method of manufacturing a light emitting component, the method comprising:
- determining a color target for the light emitting component;
preparing a phosphor material based on the color target;
determining an initial amount of the phosphor material required to meet the color target for the light emitting component;
providing at least one light emitting die attached to a substrate;
disposing the initial amount of the phosphor material over the at least one light emitting die;
performing the steps of;
(i) comparing light emitted from the light emitting component to the color target;
(ii) if the light emitting component is above the color target, removing at least some of the initial amount of phosphor material from the light emitting component;
(iii) if the light emitting component is below the color target, adding phosphor material to the light emitting component;
repeating steps (i) through (iii) more than once; and
curing the phosphor material disposed on the light emitting component.
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Abstract
A method of disposing a phosphor material on an LED such that the LED emits white light and adjusting the quantity of phosphor material such that the white light meets a color target. A formulated procedure is used to determine the adjustment required, and includes a correlation between a change in position of a color of an LED on a CIE diagram and a known quantity of phosphor material added to the LED.
22 Citations
20 Claims
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1. A method of manufacturing a light emitting component, the method comprising:
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determining a color target for the light emitting component; preparing a phosphor material based on the color target; determining an initial amount of the phosphor material required to meet the color target for the light emitting component; providing at least one light emitting die attached to a substrate; disposing the initial amount of the phosphor material over the at least one light emitting die; performing the steps of; (i) comparing light emitted from the light emitting component to the color target; (ii) if the light emitting component is above the color target, removing at least some of the initial amount of phosphor material from the light emitting component; (iii) if the light emitting component is below the color target, adding phosphor material to the light emitting component; repeating steps (i) through (iii) more than once; and curing the phosphor material disposed on the light emitting component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of manufacturing a plurality of light emitting components, the method comprising:
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determining a color target for the plurality of light emitting components; preparing a phosphor material based on the color target; determining an initial amount of the phosphor material required to meet the color target for the plurality of light emitting components; providing a plurality of light emitting dice attached to a substrate; disposing the initial amount of the phosphor material over the plurality of light emitting dice; comparing light emitted from each of the plurality of the light emitting components to the color target; performing the steps of; (i) identifying passing light emitting components that meet the color target; (ii) identifying high light emitting components that are above the color target and removing at least some of the initial amount of phosphor material from the high light emitting components; (iii) identifying low light emitting components that are below the color target and adding phosphor material to the low light emitting components; (iv) comparing light emitted from each of the high and each of the low light emitting components to the color target; curing the phosphor material disposed on the plurality of light emitting components; and singulating the plurality of light emitting components. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification