Novel glassy tetra(N-alkyl-3-bromocarbazole-6-yl)silanes as building blocks for efficient and nonaggregating blue-light-emitting tetrahedral Materials.
[structure: see text] Tetrahedral precursors of tetra(N-alkyl-3-bromocarbazole-6-yl)silanes (1-3), which were amorphous with T(g) 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.
Institute of Materials Research and Engineering, 3 Research Link, Singapore. xm-liu@imre.a-star.edu.sg
Xue-Ming
XM
Liu
Jianwei
J
Xu
Xuehong
X
Lu
Chaobin
C
He