Abstract
We present two multi-resonant thermally activated delayed fluorescence (MR-TADF) emitters and show how further borylation of a deep blue MR-TADF emitter, DIDOBNA-N, both blue shifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N. DIDOBNA-N emits bright blue light (lPL = 444nm, FWHM = 64nm, FPL = 81%, td = 23 ms, 1.5 wt% in TSPO1). The deep blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQEmax) of 15.3% for a device with CIEy of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near UV emission (lPL = 402nm, FWHM = 19nm, FPL = 74.7%, td = 133 ms, 1.5 wt% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near UV OLED at 16.2%. With a CIEy coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date. This article is protected by copyright. All rights reserved.
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