Patent ID: 7364772

Claim:
A method for coating an organic layer onto a substrate in a vacuum chamber comprising: (a) providing a manifold including side and bottom walls defining a chamber for receiving organic material, and an aperture plate disposed between the side walls, the aperture plate having a plurality of spaced apart apertures for emitting vaporized organic material; the aperture plate including conductive material which in response to an electrical current produces heat; (b) heating the organic material to a temperature which causes its vaporization, and heating the side walls of the manifold, the aperture plate includes a first aperture plate emissive surface that radiates energy into the chamber and a second aperture plate emissive surface that radiates less energy to the substrate wherein the second aperture niate emissive surface has an emissivity lower than the first aperture plate emissive surface; and (c) concentrating heat in an unsupported region of the aperture plate adjacent to the apertures by providing an electrical insulator coupling the aperture plate to the side walls.