Threshold Reduction in Polymer Lasers Based on Poly(9,9-dioctylfluorene) with Statistical Binaphthyl Units (pages 1188–1192)
T. Rabe, M. Hoping, D. Schneider, E. Becker, H.-H. Johannes, W. Kowalsky, T. Weimann, J. Wang, P. Hinze, B. S. Nehls, U. Scherf, T. Farrell and T. Riedl
Article first published online: 4 JUL 2005 | DOI: 10.1002/adfm.200500023
Novel poly(9,9-dioctylfluorene) copolymers containing statistically distributed binaphthyl spacer groups hinder the formation of the highly ordered β-phase in thin films of the copolymers, resulting in a dramatic reduction of the excitation density required to reach the threshold of distributed feedback lasers (see Figure). Thus, these copolymers may be useful as gain materials in organic solid-state lasers.