Contact printing of the emitting layer for high performance multilayered phosphorescent organic light-emitting diodes

Efficient multilayered organic light-emitting diodes (OLEDs) were fabricated using contact printing. In order to overcome the mixing problem occurring between the organic layers during the solution processes, contact printing was utilized on a small molecule layer. Since this contact printing allows multilayer stacking without the damage caused by organic solvents, high-performance OLEDs could be fabricated with solution-based small molecules employing a low cost process. In this study, the performance of the multilayered OLEDs manufactured by the contact printing process is significantly enhanced than that found in spin-coated devices.

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► Efficient multilayered OLEDs utilized by contact printing.
► Two structures fabricated by process difference.
► The performance of the OLEDs employing contact printing is significantly enhanced than that found in spin-coated devices.
► The contact printing process allows the fabrication of high performance OLEDs in a low cost process.