Synthesis and Characterization of π-Conjugated Multi-branched Molecules Bearing Carbazole and Phenothiazine Peripheral Groups

Abstract

A novel class of conjugated multi-branched molecules bearing N-hexyl substituted carbazoles and phenothiazine as peripheral groups and [2,4,5-Tris-(diethoxyphosphorylmethyl)benzyl]phosphonic acid diethyl ester core has been synthesized through Horner-Emmons reaction in moderate to good yield. 8HCz-Den and 8HPTz-Den molecules have absorption maxima at 349 and 381 nm in solution states and maximum PL intensities were observed at 434 and 506 nm, respectively. They exhibited good self-film forming properties by solution casting and spin coating. In particular, by doping [2,6-bis(2-(5-(dibutylamino)phenyl)vinyl)-4H-pyran-4-ylidene]propanedinitrile, red emission could be achieved through complete Förster energy transfer process from the light harvesting host to the guest molecule.

Keywords:

• absorption
• electroluminescence
• energy transfer
• multi-branched molecule
• photoluminescence

Acknowledgments

This work was supported by LG-Philips LCD for financial support. (Grant M1-0302-00-0027, 2007). Particularly, Prof. D. H. Choi thanks the Seoul R&BD Program for financial support. (2006–2007).