3‐(9‐Carbazolyl)carbazoles and 3,6‐Di(9‐carbazolyl)carbazoles as Effective Host Materials for Efficient Blue Organic Electrophosphorescence

Linking topology in oligocarbazoles (see figure) has a strong influence on their electronic properties. 3 (6), 9′-linked oligocarbazoles exhibit unusual suppression of electronic coupling between units, leading to localized excited states and very small reduction of triplet energies (compared to the monomer). Coupled with their excellent morphological stability, this makes them suitable as host materials for blue electrophosphorescence devices. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂089/2007/c0822ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.