Abstract: Aspects of the present invention concern a device and a process for continuous production of substrates provided with organic electroluminescent materials (OLED), especially OLED displays, screens, panels or other lighting elements, in which the device has a vacuum space and a transport device for transporting the substrates to be coated, which is at least partially arranged along the vacuum space and comprises carriers for the substrates, with the transport device comprising at least one endless loop for transport of the carriers and with the vacuum space being divided at least into two with a first part, in which is provided a first section of the transport device for transporting the carriers in a first direction (substrate-transport direction), and with a second part, in which is provided a second section of the transport device for transport of the carriers in a second direction (carrier-return-transport direction).