Abstract
Multilayer structure polymer light-emitting diodes (PLEDs) with a patterned second emission layer are presented. We utilize polydimethylsiloxane (PDMS) mask combined with blade coating method to fabricate multilayer patterned PLEDs by solution process. Multilayer structure and patterned emission layer are achieved by blade coating and a PDMS mask, respectively. Owing to the elasticity and good adhesion of PDMS mask, it can stick on the first emission layer very tightly without any damage on the emission layer. The second emission layer is then blade coated with a designed pattern by the PDMS layer; therefore, the solution can be enclosed by the patterned PDMS layer to form a uniform organic layer. We can easily define the emission region and colors with such method, which leads to dual-color, uniform and patterned PLEDs. The current efficiency of patterned and standard device are 1.78 cd/A and 1.56 cd/A, and the luminance of patterned and standard device are 4133 cd/m2 and 3893 cd/m2. Therefore, device performance of patterned PLEDs is comparable to that of a standard one. PDMS mask certainly does no significant damage on the organic layer.