Efficient Narrowband Circularly Polarized Light Emitters Based on 1,4‐B,N‐embedded Rigid Donor–Acceptor Helicenes
Fangyuan Zhang, Florian Rauch, Asim Kumar Swain, Todd B. Marder, Prince Ravat
Abstract
Abstract Narrow‐band emission is essential for applicable circularly polarized luminescence (CPL) active materials in ultrahigh‐definition CP‐OLEDs. One of the most promising classes of CPL active molecules, helicenes, however, typically exhibit broad emission with a large Stokes shift. We present, herein, a design strategy capitalizing on intramolecular donor‐acceptor interactions between nitrogen and boron atoms to address this issue. 1,4‐B,N‐embedded configurationally stable single‐ and double helicenes were synthesized straightforwardly. Both helicenes show unprecedentedly narrow fluorescence and CPL bands (full width at half maximum between 17–28 nm, 0.07–0.13 eV) along with high fluorescence quantum yields (72–85 %). Quantum chemical calculations revealed that the relative localization of the natural transition orbitals, mainly on the rigid core of the molecule, and small values of root‐mean‐square displacements between S 0 and S 1 state geometries, contribute to the narrower emission.