Stenciling phosphor layers on light emitting diodes
US7049159B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2003 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Nov 5, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/0361
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.