10H-spiro[acridine-9,9'-xanthene]

10H-spiro[acridine-9,9'-xanthene] is a weak electron donor moiety. Its structure is similar to spiro[acridine-9,90 -fluorene] and their properties are similar. They all have effective donor properties and the expectation of a large dihedral angle arising from steric repulsion by the two H atoms in the peri-position. Hence, they are often used simultaneously to synthesize TADF and compare the properties of the two synthesized materials.

10H-spiro[acridine-9,9'-xanthene] could used as an intermediates of photoelectric materials to fabricate a TADF OLED emitter. Since its good donor properties and the expectation of a large dihedral angle arising from steric repulsion by the two H atoms in the peri-position, it was commonly selected as a wide-gap donor moiety to fabricate highly efficient blue TADF materials whit diphenylsulphone (DPS) as an electron acceptor[1]. 10H-spiro[acridine-9,9'-xanthene] is also used to construct phosphine oxide (PO) hosts through introducing one or two diphenylphosphine oxide groups at 2 and 7 positions of acridine ring, respectively. This material could used to fabricate single-emissive-layer Thermally activated delayed fluorescence (TADF) white organic light-emitting diodes[2].

[1]Lee G R, et al. Theoretical Study of Benzofuro-Pyridine Derivatives-Based Organic Light-Emitting Diodes Exhibiting Thermally Activated Delayed Fluorescence. Journal of Nanoscience and Nanotechnology, 2019; 19: 787-4790.
[2] Zhu A, et al. Phosphorylation amplified asymmetry of spiro[acridine-9,9'-xanthene] hosts for efficient blue and white thermal activated delay fluorescent diodes. Journal of Materials Chemistry C, 2023.