摘要： Narrow-band deep-blue (emission peak < 460 nm) TADF emitters are in demand for commercial OLED display applications, yet the development of efficient emitters with low efficiency roll-off is very challenging. To address this issue herein we studied carbazole-naphthyridine (donor-acceptor) based blue-emitting TADF compounds, which were designed by considering both H-bonding and sterically controlled charge-transfer (CT) interactions between D and A units. Methyl substitution employed at the 1st position of t-butyl-carbazole donors was found to affect CT strength and consequently TADF properties of the studied compounds enabling significant reduction of delayed fluorescence lifetime (down to 3.1 μs) and enhancement of reverse intersystem crossing rate (up to 106 s-1). The naphthyridines were demonstrated to hold great potential for deep-blue TADF emitters suitable for both vacuum- and solution-processed TADF OLEDs. The optimized devices with 7 wt% of naphthyridine emitter in weakly polar mCP host delivered external quantum efficiencies (EQEs) of up to ~17.6% and ~13.5% for vacuum- and solution-processed OLEDs, respectively. Unsubstituted naphthyridine exhibited deep-blue (λmax < 460 nm) and narrow-band (FWHM = 66 nm) electroluminescence, whereas more twisted methyl-substituted compound expressed broader band (FWHM >80 nm) sky-blue (λmax ? 480 nm) emission. The demonstrated emitters are among the best-performing conventional D-A-type blue/deep-blue TADF emitters in terms of EQE and efficiency roll-off properties of their devices.