Patent ID: 11881542
Assignee: LUMILEDS, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method for making a wavelength-conversion layer, the method comprising:
forming, growing, or depositing regions of a first conversion layer material on a set of unmasked first pixel areas of a surface of a substrate, a set of second pixel areas of the surface of the substrate surface and a set of third pixel areas of the surface of the substrate being masked, the sets of first, second, and third pixel areas contiguously filling at least a portion of the surface of the substrate;
selectively removing the mask material from the second pixel areas while leaving the mask material on the third pixel areas;
forming, growing, or depositing a first sidewall layer on exposed side surfaces of both the regions of the first conversion layer material and the mask material remaining on the third pixel areas, those having been exposed by removal of the mask material from the second pixel areas;
forming, growing, or depositing regions of a second conversion layer material, different from the first conversion layer material, on the second pixel areas, each side surface of the regions of the second conversion layer material being positioned against the first sidewall layer;
removing the mask material from the third pixel areas;
forming, growing, or depositing a second sidewall layer on exposed side surfaces of the regions of the first conversion layer material and exposed portions of the first sidewall layer on side surfaces of the regions of the second conversion layer material, those having been exposed by removal of mask material from the third pixel areas; and
forming, growing, or depositing regions of a third conversion layer material, different from the first and second conversion layer materials, on the third pixel areas, each side surface of the deposited third conversion layer material being positioned against the second sidewall layer, at least two among the first, second, and third conversion layer materials being wavelength-converting phosphor materials, the regions of the first, second, and third conversion layer materials forming the wavelength-conversion layer.