Simultaneously achieving high efficiency, high color purity, and low efficiency roll-off remains a critical challenge in deep-blue organic light-emitting diodes (OLEDs). Herein, we strategically synthesize two novel rigid tetradentate Pt(II) emitters incorporated with a new polycyclic aromatic hydrocarbon molecular skeleton, 7,12-dihydro-5H-7,12-[1,2]benzenonaphtho[2,3-b]carbazole (BNCz) (PtJY1 and PtJY2). A three-dimensional triptycene group is firstly merged into the carbazole ligand, together with bulky steric substituents in the benzocarbene unit, to synergistically suppress inter- and intramolecular interactions, enhance molecular rigidity, and modulate excited-state properties. PtJY1 and PtJY2 exhibit ultra-narrow deep-blue emission in toluene at room temperature, with peaks at 461.8 and 464.2 nm and full-width at half-maximum (FWHM) values of 16.6 and 15.1 nm, respectively. High photoluminescence quantum yields (ΦPL) of 95% and 99% are achieved in doped host films. Corresponding deep-blue OLEDs achieve maximum external quantum efficiencies (EQEmax) of 29.3% and 31.2%, with Commission Internationale de l’Éclairage (CIE)y of 0.133 and small FWHM values of 21 and 19 nm, respectively. At 1000 cd/m2, the EQEs are retained at 27.0% and 27.8%, exhibiting extremely low efficiency roll-off. Notably, the device performance of PtJY2 ranks among the best-balanced Pt(II)- and Ir(III)-based blue phosphorescent OLEDs with CIEy < 0.15. This work provides a valuable strategy for developing highly efficient, narrow-spectrum deep-blue tetradentate Pt(II) emitters for optimal performance in OLED applications.
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