Details

Autor(en) / Beteiligte

• Yuan, Li
• Tu, Zhen-Long
• Xu, Jun-Wei
• Ni, Hua-Xiu
• Mao, Zhi-Ping
• Xu, Wen-Ye
• Zheng, You-Xuan

Titel

Color-tunable circularly polarized electroluminescence from a helical chiral multiple resonance emitter with B-N bonds

Ist Teil von

• Science China. Chemistry, 2023-09, Vol.66 (9), p.2612-2620

Ort / Verlag

Beijing: Science China Press

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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] 2 N 2 , 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 PL ∣) of 1.0 × 10 −3 . 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 EL ∣ factor of 7.7 × 10 −4 . 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.