As promising luminescent materials for organic light-emitting diodes (OLEDs), thermally activated delayed fluorescence materials are booming vigorously in recent years, but robust blue ones still remain challenging. Herein, we report three highly efficient blue and deep-blue delayed fluorescence materials comprised of a weak electron acceptor chromeno[3,2-c]carbazol-8(5H)-one with a rigid polycyclic structure and a weak electron donor spiro[acridine-9,9’-xanthene]. They hold distinguished merits of excellent photoluminescence quantum yields (99%), ultrahigh horizontal transition dipole ratios (93.6%), and fast radiative transition and reverse intersystem crossing, which furnish superb blue and deep-blue electroluminescence with Commission Internationale de I’Eclairage coordinates (CIE_x,y) of (0.14, 0.18) and (0.14, 0.15) and record-beating external quantum efficiencies (η_exts) of 43.4% and 41.3%, respectively. Their efficiency roll-offs are successfully reduced by suppressing triplet-triplet and singlet-singlet annihilations. Moreover, high-performance deep-blue and green hyperfluorescence OLEDs are achieved by utilizing these materials as sensitizers for multi-resonance delayed fluorescence dopants, providing state-of-the-art η_exts of 32.5% (CIE_x,y = 0.14, 0.10) and 37.6% (CIE_x,y = 0.32, 0.64), respectively, as well as greatly advanced operational lifetimes. These splendid results can surely inspire the development of blue and deep-blue luminescent materials and devices.

作为有机发光二极管（OLED）的有前途的发光材料，热激活延迟荧光材料近年来蓬勃发展，但稳健的蓝色材料仍然具有挑战性。在此，我们报告了三种高效的蓝色和深蓝色延迟荧光材料，由弱电子受体铬烯[3,2-c]咔唑-8(5H)-具有刚性多环结构和弱电子供体螺[吖啶]组成-9,9'-呫吨]。它们具有优异的光致发光量子产率（99%）、超高水平跃迁偶极比（93.6%）、快速辐射跃迁和反向系间穿越等显着优点，可提供具有国际照明委员会坐标的极好的蓝色和深蓝色电致发光(CIE _x,y) 的 (0.14, 0.18) 和 (0.14, 0.15) 以及创纪录的外部量子效率 ( η _ext s) 分别为 43.4% 和 41.3%。通过抑制三重态-三重态和单重态-单重态湮灭，成功降低了它们的效率下降。此外，通过将这些材料用作多共振延迟荧光掺杂剂的敏化剂，可实现高性能深蓝色和绿色超荧光 OLED，提供 32.5%（CIE x , _y = _0.14  ， 0.10) 和 37.6% (CIE _x,y  = 0.32, 0.64)，以及大大延长的使用寿命。这些出色的成果必将激发蓝色和深蓝色发光材料和器件的发展。