| abstract |
The invention relates to the technical field of organic luminescent materials, in particular to a spirofluorene compound and a luminescent device thereof. Spiro difluorene compounds selected freely I compounds: Y 1 and Y 2 denote hydrogen, electron-absorbing groups or electron-donating groups independently, respectively; at least a substituent in X1 and X2 is the substituent shown in formula II; M denotes —S—, —P—, —SO—, —SO 2 —, —S(═S)—, —S(═S)(═S)—, —PO—, —PO 2 —, —P(═S)—, —P(═S)(═S)—, —C(═O)—; N 1 , N 2 , N 3 and N 4 denote carbon or nitrogen atoms independently, respectively; N is an integer of 0˜4. The spirobifluorene compound of the invention has A-D-A chemical structure, and a spatial dihedral angle of nearly 90° is formed between an electron D unit and an electron-absorbing A unit, which is good for HOMO-LUMO orbital separation of thermal activation of delayed fluorescence materials, in order to obtain ideal ΔEST. |