NOVELTY - The evaporator comprises a heat source for the evaporation of organic materials in vacuum for the production of large surface coating during the production of light diodes or organic solar cells and/or organic electronics, and an evaporation container (3) with discharge opening (5) for evaporated materials and a discharge channel (7) arranged downstream of the discharge opening, where the evaporated material flows through the discharge channels to a material to be coated. A regulation and/or control unit (12) is provided for the adjustment of free cross-section of the discharge opening.    USE - Evaporator useful in a coating plant for the evaporation of organic materials in vacuum for the production of large surface coating during the production of organic light diodes or organic solar cells (claimed).    ADVANTAGE - The evaporator can be manufactured with good controllability and durability.    DETAILED DESCRIPTION - The evaporator comprises a heat source for the evaporation of organic materials in vacuum for the production of large surface coating during the production of light diodes or organic solar cells and/or organic electronics, and an evaporation container (3) with discharge opening (5) for evaporated materials and a discharge channel (7) arranged downstream of the discharge opening, where the evaporated material flows through the discharge channels to a material to be coated. The free cross-section of the discharge openings and/or the free cross-section of the discharge channel are adjustable during the evaporation of materials. The evaporation container is arranged relative to the discharge channel and is adjustable relative to the discharge channel of the free cross-section of the discharge opening and/or the discharge channel through relative pivoting. A regulation and/or control unit (12) is provided for the adjustment of free cross-section of the discharge opening and/or the discharge channel in dependent upon an actual- and/or desired value such as evaporation rate and/or mixing contents. The heat source is a double tube quartz lamp (6) external of the evaporation container heated through the heat radiation. The metallic evaporation container is double walled. The evaporation container and/or the discharge opening has a linear extension and is formed as metallic tube. A number and arrangement of lamp providing a homogeneous heating of the evaporation container are realized. The discharge channel is funnel-shaped and the evaporated material flows through the discharge channel directly on a substrate to be coated moving relative to the discharge channel. A wall of the discharge channel is heated at a temperature that lies over an evaporation temperature of the organic materials. Sensors are provided for monitoring the temperature in the area of the evaporation container and are connected with a temperature control device in signal-transmitting manner. A housing coolable by water is provided. INDEPENDENT CLAIMS are included for:    (1) an arrangement of two evaporators; and    (2) a coating plant for in-line coating.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of an evaporator.    Evaporation container (3)    Discharge opening (5)    Lamp (6)    Discharge channel (7)    Regulation- and/or control unit. (12)