Circularly polarized (CP) organic light-emitting diodes (OLEDs) are optoelectronic devices that are capable of emitting left-and right-CP light using organic CP luminescence (CPL) emitters under unpolarized excitations, making them highly valuable in applications such as 3D and high-resolution displays, information encryption, and spintronic devices. With the rapid conceptual advancement in the molecule design of CPL emitters, the performances of CP-OLEDs have made significant progress. Among all CPL molecules, multiple resonance (MR) organoboron chiral emitters have aroused particular attention owing to their unique alternative distribution of frontier molecular orbitals on single atoms, which can suppress vibronic couplings and minimize structural relaxation to generate high color-purity narrowband emissions. Consequently, boron/nitrogen (B/N) embedded CPL-MR emitters with axial chirality, central chirality, and planar chirality structures, etc have been developed, enabling the realization of highly efficient CP-OLEDs with narrowband emission across the whole visible region. Among the various manifestations of chirality, helical chirality is particularly notable. The highly twisted spiral structure ensures a stable molecular configuration, guaranteeing exceptional physical and chemical stability and also effectively suppresses the intermolecular π-π stacking in aggregate films. In 2022, Zhu et al. constructed a pair of greenish-blue BN-[4]helicene enantiomers employing sulfur atoms and acridan substituents to disrupt peripheral symmetry, realizing a |glum| of (1.0-2.0)ⅹ10 -3 and an FWHM of 43 nm. Based on this emitting core, Yang et al. enhanced the helicity of helicenes by developing a pair of green BN-[5]helicene enantiomers, which exhibited glums of +2.0/-2.1ⅹ10 -3 and an FWHM of 46 nm. Wang et al. also reported a green BN [6]helicene CPL emitter utilizing an edge-topology molecular-engineering strategy, featuring glums of +5.19/-3.81ⅹ10 -4 for the enantiomers and a relatively small FWHM of 35 nm. Quite recently, Chen and Li et al. constructed a highly helical BN [9]helicene, exhibiting a high |glum| of 5.8ⅹ10 -3 with an orange emission peaking at 575 nm and an FWHM of 47 nm. Albeit those preliminary works, devising B,N-MR heterohelicenes that balance the dissymmetry factor and the photoluminescence quantum yield remains a formidable challenge, not to mention that most previous reported helicenes always exhibited wide emission spectra with FWHM> 40 nm (Figure ). Besides, simply extending the rigid helical π-conjugated skeleton by incorporating additional fused aromatic rings to enhance the g values seems does not always work. A more profound investigation into the relationship between molecular geometry and electronic structure is therefore necessary for the aim of refining B,N-MR hetero-helicene structures. Undoubtedly, the synthesis of such helicenes is also an enormous challenge and till now, no BN-hetero[8]helicenes have been reported. Regarding the performances of CP-OLEDs, despite the significant enhancements in device efficiency, the stability of CP-MR emitters under electrical excitation remains a relatively understudied area. This gap in knowledge is critical, as stability is a key factor for practical applications of these materials in optoelectronic devices.