Unraveling the positive effect of twisted helicene structure on narrowband electroluminescence
Abstract
π-extension of a classic MR backbone (CzBN) and disclose how the twisted structure plays a positive role in reducing the emission bandwidth. Specifically, π-extension of CzBN to form a [5]helicene substructure (BN-5H) induces serious vibrations, while further extending the helicene moiety to build a [7]helicene substructure (BN-7H) suppresses undesirable vibrations by locking the conformation. As a consequence, BN-7H achieves a smaller full-width at half-maximum (FWHM) of 28 nm compared with BN-5H (33 nm) in organic light-emitting diodes and longer device lifetime. These results overturn the traditional cognition of the detrimental effect of highly twisted structures on narrowband emission and offer a new design concept for the future development of narrowband electroluminescence materials.
Fields of Study & Subjects
Synthesis and Properties of Aromatic Compounds
Organoboron and organosilicon chemistry
Graphene research and applications
Publication details
- Journal / source
- Chemical Science
- Publisher
- Royal Society of Chemistry (RSC)
- Volume
- 17
- Issue
- 11
- Pages
- 5694–5700
- Publication date
- 1 January 2026
- Language
- EN