32.
Novel light-emitting organic materials comprising conjugated oligomers chemically attached
via a flexible spacer to an electron–or hole-conducting core were synthesized by
Stille cross-coupling methodology and designed for tunable charge injection and optical properties. The hyperbranched structures
have been characterized by
1H NMR,
13C NMR, and UV-VIS spectroscopy. The obtained structures show good stability in common organic solvents such as CHCl
3, toluene, and CH
2Cl
2 and exhibit excellent thermal stability. A preliminary electroluminescence properties were also investigated. This class
of materials will help to balance charge injection and transport and to spread out the charge recombination zone, thereby
significantly improving the device efficiency and lifetime of unpolarized and polarized OLEDs.
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