Laminating encapsulant film containing phosphor over LEDS
First Claim
1. A method of fabricating a light emitting diode (LED) comprising:
- providing a plurality of groups of LEDs, each group of LEDs producing a different range of peak wavelengths determined by testing;
mounting a plurality of LEDs of a single particular group onto a submount;
providing a plurality of different wavelength-conversion sheets, each sheet comprising a phosphor combined with a flexible encapsulate material, each sheet having a different phosphor conversion characteristic;
selecting a particular one of the wavelength-conversion sheets for applying over the LEDs on the submount;
energizing one or more LEDs on the submount;
detecting an emitted color generated by the combination of the energized one or more LEDs and the particular wavelength-conversion sheet to ensure the emitted color meets a predetermined color; and
encapsulating LEDs from the single particular group mounted on a submount with the particular wavelength-conversion sheet if the emitted color meets the predetermined color.
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Accused Products
Abstract
A process is described for wavelength conversion of LED light using phosphors. LED dies are tested for correlated color temperature (CCT), and binned according to their color emission. The LEDs in a single bin are mounted on a single submount to form an array of LEDs. Various thin sheets of a flexible encapsulant (e.g., silicone) infused with one or more phosphors are preformed, where each sheet has different color conversion properties. An appropriate sheet is placed over an array of LED mounted on a submount, and the LEDs are energized. The resulting light is measured for CCT. If the CCT is acceptable, the phosphor sheet is permanently laminated onto the LEDs and submount. The lamination encapsulates each LED to protect the LEDs from contaminants and damage. The LEDs in the array of LEDs on the submount are separated. By selecting a different phosphor sheet for each bin of LEDs, the resulting CCT is very uniform across all bins.
80 Citations
29 Claims
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1. A method of fabricating a light emitting diode (LED) comprising:
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providing a plurality of groups of LEDs, each group of LEDs producing a different range of peak wavelengths determined by testing;
mounting a plurality of LEDs of a single particular group onto a submount;
providing a plurality of different wavelength-conversion sheets, each sheet comprising a phosphor combined with a flexible encapsulate material, each sheet having a different phosphor conversion characteristic;
selecting a particular one of the wavelength-conversion sheets for applying over the LEDs on the submount;
energizing one or more LEDs on the submount;
detecting an emitted color generated by the combination of the energized one or more LEDs and the particular wavelength-conversion sheet to ensure the emitted color meets a predetermined color; and
encapsulating LEDs from the single particular group mounted on a submount with the particular wavelength-conversion sheet if the emitted color meets the predetermined color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A light emitting diode (LED) structure comprising:
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one or more LEDs mounted on a submount, each LED on the submount emitting a peak wavelength within a predetermined range of peak wavelengths; and
a preformed encapsulant sheet, of uniform thickness, overlying and encapsulating each LED on the submount, the encapsulant sheet containing one or more types of phosphors for converting light emitted by each LED into light of a different wavelength. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification