Benzofuran [3, 2-b] benzofuran compound as well as preparation method and application thereof

The invention discloses a benzofuran [3, 2-b] benzofuran compound as well as a preparation method and application thereof, and relates to the technical field of organic light-emitting devices. Comprising a structural general formula (I), and a main structure formed by connecting a benzofuran [3, 2-b] benzofuran (BFBF) group and a benzofuran [3, 2-D] pyrimidine (BFPD) group through a sigma bond is constructed, so that the compound has the strong fluorescence characteristic of BFBF and the excellent charge migration characteristic of BFPD. Meanwhile, through modification of a substituent group, the thermal stability of a BFBF group can be improved, molecular accumulation is further improved, molecules have higher rigidity, and the service life of a light-emitting device can be prolonged and the light-emitting efficiency of the device can be improved when the BFBF is used for preparing the light-emitting device. 本发明公开了一种苯并呋喃[3,2-b]苯并呋喃化合物及其制备方法和应用，涉及有机发光器件技术领域。包括结构通式（Ⅰ），本发明构建了以苯并呋喃[3,2-b]苯并呋喃（BFBF）基团与苯并呋喃[3,2-D]