Three-dimensional aliphatic fused and bridged rings are key pharmacophores in drugs and bioactive natural products. Here, we reported an organocatalytic visible-light induced dearomative cycloaddition of (hetero)arenes, with organic light-emitting diode material 4CzIPN or readily accessible thioxanthone as photocatalyst. A series of cyclobutane-fused polycyclic structures and bridgedbicyclo scaffolds were prepared