“…vibrational transition. 26 Zhang and Adachi proposed an ultrapure green emitter of 11,16,28,33,39pentakis(2-methylprop-2-yl)-19,36-dibora-1,7,24-triazatridecacyclo [21.19.2.12,6.17,18.124,35.020,43.019,47.036,44.031,45.014, 46.08,13.037,42.025,30]heptatetraconta-2(3),4,6 (47),8(9),10,12, 14 (15), 16,18(46),20 (43), 21,23(44),25 (26), 27,29,31(45), 32,34,37-(42),38,40-henicosaene (DBTN-2) based on organic boron with a highly twisted fused p-conjugated molecular design. This design concept significantly reduced the relaxation energy between the excited state and the ground state geometries, resulting in an FWHM of only 20 nm.…”