Abstract
Developing organic deep-blue multiple-resonance (MR) emitters with narrow full widths at half maximum (FWHMs) is of great significance for improving the color purity of organic light-emitting diodes (OLEDs). Herein, two MR polycyclic aromatic hydrocarbons with three-indolo[3,2,1-jk]carbazole (ICz)-embedded fragments are designed and synthesized via prolonging multiple-ICz strategy, accompanied by a deep-blue narrowband emission of 452 nm, a FWHM of 20 nm, and high photoluminescence quantum yield of 76%. Theoretical studies unveil that enlarging the atomically separated frontier molecular orbital distribution and extending the π-electron delocalization on the PAH skeleton are conducive to bathochromic-shift emission and simultaneously maintaining a small FWHM. In addition, the optimized blue OLEDs fabricated with the nitrogen-embedded MR emitter achieved a high external quantum efficiency of 12.6%.
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