P‐215: Novel Design Strategy of Multiple‐Resonance‐Type Blue Fluorescent Dopants with High Efficiency and High Color Purity

Deep blue boron based multiple resonance (MR) type fluorescent materials, BD‐1 and BD‐2 were synthesized and evaluated. Benzo[b]thiophene substituent which has low triplet energy was introduced to lower triplet energy to suppress the intermolecular interactions. Furthermore, bulky donating group was introduced to control the wavelength, color purity, and to increase molecular distance. As a result, BD‐2 based fluorescent device showed CIE coordinates of (0.134,0.087) and EQ Emax of 7.9%.