OLED Fabrication Procedures

The existing OLED fabrication procedures fall into two major categories (1) thermal vacuum evaporation of the organic layers in small molecular OLEDs, and (2) wet coating techniques of the polymer layers in PLEDs. 

One of the most salient advantages of thermal vacuum evaporation is that it enables fabrication of multilayer devices in which the thickness of each layer can be controled easily, in contrast to spin coating (see below). In addition, 2-dimensional combinatorial arrays of OLEDs, in which two parameters (e.g., the thickness or composition of two of the layers) may be varied systematically across the array, can be relatively easily fabricated in a single deposition procedure.50,12 This combinatorial fabrication greatly enhances the efficiency of systematic device fabrication aimed at optimizing the various parameters. 

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