Organic materials for an evaporation source

A method of using a compacted pellet having uniform blended mixture with at least first and second different organic components that sublime at temperatures T1 and T2 respectively, wherein T1 represents the temperature of the first organic material with the lowest sublimation temperature and T2 represents the temperature of the second organic material with the highest sublimation temperature, to form an organic layer having a uniform blended mixture of the organic components, comprising:

• (a) providing a compacted pellet, having a top and bottom surface, into a boat having an open top surface wherein the compacted pellet conforms to the interior of the boat;
• and
• (b) applying heat to the top of the compacted pellet to cause the deposition of a uniform blended mixture of the organic components to form an organic layer, wherein the top surface of the compacted pellet reaches T2 before the bottom surface reaches T1.