A Deep Blue Heteroatom Doped Nonacene That Exhibits Multi-Resonant Thermally Activated Delayed Fluorescence and its Use as an Emitter in High-Performance Deep Blue Organic Light-Emitting Diodes

17 October 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


We present a p- and n-doped nonacene compound, NOBNacene, that represents a rare example of a linearly extended ladder-type multiresonant thermally activated delayed fluorescence (MR-TADF) emitter. This compound shows efficient narrow deep blue emission (PL = 410 nm, FWHM = 38 nm, ФPL = 71%, d = 1.18 ms) in 1.5 wt% TSPO1 thin film. The organic light-emitting diode (OLED) using this compound as the emitter shows a comparable electrolumines-cence spectrum (EL = 409 nm, FWHM = 37 nm) and a maximum external quantum efficiency (EQEmax) of 8.5% at CIE coordinates of (0.173, 0.055). The EQEmax values were increased to 11.2% at 3 wt% doping of the emitter within the emissive layer of the device. At this concentra-tion, the electroluminescence spectrum broadened slightly, leading to CIE coordinates of (0.176, 0.068).


Multi-resonant thermally activated delayed fluorescence
organic light-emitting diodes

Supplementary materials

Electronic Supporting Information


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