Patent ID: 7704554

Claim:
A method for vaporizing organic materials onto a substrate surface to form a film, comprising: a) providing a vaporization apparatus for receiving a quantity of organic material that can have one or more components, each one having a different vaporization temperature, and defining a first region and a second region spaced from the first region; b) actively cooling the organic material in the first region so that each of the one or more organic components is maintained below its vaporization temperature to reduce degradation of the organic material; c) heating the second region of the vaporization apparatus above the vaporization temperature of each of the one or more organic components; and d) metering, at a controlled rate, organic material from the first region, through a member permeable to vaporized organic material, into the second region so that a thin cross section of the organic material is heated at a desired rate-dependent vaporization temperature, whereby organic material vaporizes and forms a film on the substrate surface.