Materials and Methods for OLED Microcavities and Buffer Layers
The present teachings provide methods for forming organic layers for an organic light-emitting device (OLED) using an inkjet printing or thermal printing process. The method can further use one or more additional processes, such as vacuum thermal evaporation (VTE), to create an OLED stack. OLED stack structures are also provided wherein at least one of the charge injection or charge transport layers is formed by an inkjet printing or thermal printing method at a high deposition rate. The structure of the organic layer can be amorphous, crystalline, porous, dense, smooth, rough, or a combination thereof, depending on deposition parameters and post-treatment conditions. An OLED microcavity is also provided and can be formed by one of more of the methods.
1 . An organic light-emitting device comprising:
a first electrode;
a crystalline organic layer over and electrically associated with the first electrode and having a conductivity of from 1.0×10 −9 S/m to 1.0×10 −1 S/m;
an emitting layer over and electrically associated with the crystalline organic layer, the emitting layer comprising a light-emitting organic material that emits light, upon excitation, at an emission wavelength; and
a second electrode over and electrically associated with the emitting layer.
2 . The organic light-emitting device of claim 1 , wherein the crystalline organic layer has a conductivity of from 1.0×10 −9 S/m to 1.0×10 −7 S/m.