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Color-tunable circularly polarized electroluminescence from a helical chiral multiple resonance emitter with B-N bonds.
- Source :
- SCIENCE CHINA Chemistry; Sep2023, Vol. 66 Issue 9, p2612-2620, 9p
- Publication Year :
- 2023
-
Abstract
- Chiral B,N-doped polycyclic aromatic hydrocarbons with circularly polarized luminescence (CPL) and small full-width at half-maxima (FWHM) are promising multiple resonance (MR) emitters for CP organic light-emitting diodes (CP-OLEDs). This work presents a pair of chiral MR enantiomers, P/M-o[B-N]<subscript>2</subscript>N<subscript>2</subscript>, featuring B-N bonds incorporated within a [7]-helicene skeleton. These enantiomers exhibit narrow 0–0 and 0–1 electronic transition bands, whose relative intensity can be fine-tuned by increasing doping concentrations, resulting in redshifts of the emission peak from 542 to 592 nm. The enantiomers show mirror-symmetric CPL spectra with an asymmetry factor (∣g<subscript>PL</subscript>∣) of 1.0 × 10<superscript>−3</superscript>. The hyperfluorescent CP-OLEDs with double-sensitized emitting layers display a FWHM of 33 nm, an external quantum efficiency of 25.1%, and a ∣g<subscript>EL</subscript>∣ factor of 7.7 × 10<superscript>−4</superscript>. Notably, the CP-OLEDs realize color-tunable CP electroluminescence peak from 553 to 613 nm by regulating the vibrational coupling. This work provides a novel concept for the design of helical CP-MR materials and CP-OLEDs, highlighting their potential for future applications in advanced optoelectronic devices. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16747291
- Volume :
- 66
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- SCIENCE CHINA Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 171843956
- Full Text :
- https://doi.org/10.1007/s11426-023-1712-5