Rapid Combinatorial Synthesis and Chromatography Based Screening of Phosphorescent Iridium Complexes for Solution Processing

• Published in: Advanced functional materials Vol. 22; no. 16; pp. 3406 - 3413
• Main Authors: Hohenleutner, Andreas, Schmidbauer, Susanna, Vasold, Rudolf, Joosten, Dominik, Stoessel, Philipp, Buchholz, Herwig, König, Burkhard
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 21.08.2012; WILEY‐VCH Verlag
• Subjects: combinatorial synthesis; iridium complexes; organic light-emitting diodes; phosphorescence; photodegradation; screening
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201200397

This work reports the combinatorial synthesis and screening of phosphorescent iridium complexes as solution processable emitters for OLEDs. The approach taken here allows for the rapid synthesis, isolation, spectroscopic characterization and identification of the libraries based on chromatographic methods. Subsequent analysis of the irradiation induced degradation provides insight on the stability of the complexes under continuous excitation. The method is versatile and can easily be applied to other metal complexes or organic dyes for various applications, e.g., in electroluminescence, photovoltaics and sensing. Combinatorial synthesis in combination with a chromatography based separation and characterization allows for the rapid screening of new phosphorescent iridium complexes as emitters for organic light‐emitting diodes. The approach provides information on the photophysical properties, phosphorescence efficiencies, and photostabilities of the new compounds and speeds up the discovery of promising new emitters for solution processing.