26‐1: Invited Paper: Boron Based Deep Blue TADF Materials and Hyperfluorescence Devices

We report boron based deep blue thermally activated delayed fluorescence (TADF) material and its hyperfluorescence devices. Our synthesized TADF materials show EQEs of 30~39% and long device lifetime (LT 90 ) of over 40 hrs at initial luminance of 1,000 cd/m 2 with consideration of the bond dissociation energy and host engineering. The hyperfluorescence device with these TADF hosts shows the high EQE of 39.3% and 19 nm of narrow full width at half medium (FWHM) with maximum peak at 473 nm.