Stenciling phosphor layers on light emitting diodes

Details Stenciling phosphor layers on light emitting diodes Stenciling phosphor layers on light emitting diodes

2006-05-23

2006-05-23

Luu, Chuong Anh (Department: 2818)

Semiconductor device manufacturing: process

Making device or circuit emissive of nonelectrical signal

C438S033000, C438S082000, C438S099000

Reexamination Certificate

active

07049159

ABSTRACT:
A method for forming a luminescent layer on a light emitting semiconductor device includes positioning a stencil on a substrate such that a light emitting semiconductor device disposed on the substrate is located within an opening in the stencil, depositing a stenciling composition including luminescent material in the opening, removing the stencil from the substrate, and curing the stenciling composition to a solid state. The resulting light emitting device includes a stack of layers including semiconductor layers comprising an active region and a luminescent material containing layer having a substantially uniform thickness disposed around at least a portion of the stack. A surface of the luminescent material containing layer not adjacent to the stack substantially conforms to a shape of the stack. In one embodiment, the light emitting device emits white light in a uniformly white spatial profile.

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