Fabrication and Characteristics of Increased Efficiency of Layered Polymeric Electroluminescent Diodes

概要

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We fabricated polymer electrophosphorescent organic light-emitting diodes (PHOLEDs) with a layered structure using water-soluble materials and a poly(n-vinylcarbazole) (PVCz) host doped with fac-tris(2-phenylpyridyl)Ir(III) (Ir(ppy)3). The 3-layered structure of PHOLEDs exhibit emission from Ir(ppy)3 (the emission maximum was observed at 520 nm) and show a significantly improved current efficiency of 21.0 cd/A and a luminous power efficiency of 5.2 lm/W (peak external quantum efficiency of about 6.0% has been realized compared to the conventional PHOLEDs with 2-layered structure. Furthermore, the 4-layered structure of PHOLEDs using tris(8-hydroxyquinoline)aluminum (Alq3) as electron transport layers exhibited a current efficiency of 28.1 cd/A and a luminous power efficiency of 6.0 lm/W (peak external quantum efficiency of about 8.0%). Our results suggest that the layered structure using water-soluble materials improves device performances and is effective for facilitating the fabrication by a wet process.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-04-15