In conclusion, readily available SDS micelles facilitated a [2+2] photocycloaddition with blue light via a long-lived triplet state aggregate with room temperature phosphorescence using commercially available and cheap chalcone. This represents a novel activation strategy using micellar photocatalysis for synthetic applications without the need of an expensive transition metal catalyst nor oxygen removal. The small molecule substrate is not designed to show RTP, but emission is enabled by the restricted spatial environment. Therefore, this approach is promising for applications in sustainable synthetic applications.