Evaporation source, apparatus and method for the preparation of organic El device

摘要

An evaporation source includes an insulating container adapted to receive a volume of source material therein and a heater closely disposed around the container for heating and evaporating the source material into a vapor. The effective contact area of the container in contact with the source material is correlated to the volume of source material. The evaporation source is useful in the preparation of organic EL devices.