Fabrication of Organic Light‐Emitting Devices by Low‐Pressure Cold Welding

Low‐pressure cold welding has been used to fabricate 200 μm diameter organic light‐emitting devices (OLEDs) (see Figure). The contacts are made by transferring a metal film from a patterned, soft elastomeric stamp onto unpatterned organic and metal layers on a substrate. The process does not adversely affect the OLED performance when compared with those fabricated by shadow mask patterning.