Phosphor-coated light extraction structures for phosphor-converted light emitting devices

摘要

A conformal thin-film phosphor layer is disposed over a surface of a hemispherical lens, a Fresnel lens, or a microlens array, thereby forming a phosphor-coated light extraction structure. Also disclosed is a phosphor-converted photonic crystal light emitting device that incorporates a thin-film phosphor layer. A wafer-level packaging process incorporating a thin-film phosphor layer is also disclosed herein.

主权项

1. A method of forming a phosphor-converted light emitting device, comprising:
providing a packaging substrate including an array of submount reflectors; connecting an array of light emitting devices to the packaging substrate; providing a phosphor-coated microlens array; connecting the provided phosphor-coated microlens array to the packaging substrate, wherein the phosphor-coated microlens array is spaced apart from the array of light emitting devices; and dicing the packaging substrate to form individual phosphor-converted light emitting devices, wherein providing the phosphor-coated microlens array includes:
depositing a first phosphor powder layer on a microlens array, the first phosphor powder layer including first phosphor particles that are distributed on a surface of the microlens array; andsubsequent to depositing the first phosphor powder layer, depositing a first polymer film over the first phosphor powder layer to serve as a binder for the first phosphor particles.