|Scheler, E.; Betthausen, E.; Strohriegl, P.: Synthesis and Properties of Alternating Fluorene-Based Oligomers for Sub-µm Photopatterning, Macromolecular Chemistry and Physics, 211(19), 2081-2089 (2010) -- DOI: 10.1002/macp.201000165|
The synthesis of alternating photo-crosslinkable fluorene co-oligomers via Suzuki cross coupling is reported. The co-oligomers were characterized using NMR and GPC, the results showing effective control of molecular weight. The oligomers have low T(g)s of 53-63 degrees C and are thermally stable up to approximate to 300 degrees C. Using TPD as co-monomer, a blue-emitting oligomer was obtained, a yellow-fluorescent material for benzothiadiazole, and a red (film) and yellow-green (solution) emitting material for bithiophene. The energy levels are very similar to those of randomly linked oligomers. The photo-crosslinking behavior was studied and under optimized conditions a lateral resolution of 600 nm was obtained.