Novel Glassy Tetra(N-alkyl-3-bromocarbazole-6-yl)silanes as Building Blocks for Efficient and Nonaggregating Blue-Light-Emitting Tetrahedral Materials
journal contributionposted on 07.07.2005, 00:00 by Xue-Ming Liu, Jianwei Xu, Xuehong Lu, Chaobin He
Tetrahedral precursors of tetra(N-alkyl-3-bromocarbazole-6-yl)silanes (1−3), which were amorphous with Tg being adjustable by changing the chain length of the N-substitutent, were developed. Fluorene-conjugated glassy compound 4 and hyperbranched polymer 5 were synthesized from the precursors via Suzuki coupling reaction. 4 and 5 emitted blue light efficiently in the condensed state with high quantum efficiencies of 80 (4) and 59% (5) and small fwhm (full width at half-maximum) of 48 (4) and 55 nm (5), indicating that they did not pack into detrimental aggregates in the solid state.