Super Phosphorescence Resonance Energy Transfer (PRET) of Clusterization‐Triggered Emission Enables Full‐Spectrum Dynamic Room‐Temperature Afterglow

Abstract Clusterization‐triggered emission is emerging as a powerful strategy leading to useful luminescence such as room‐temperature phosphoresce (CTE‐RTP), yet people's recognition on CTE‐RTP is still very limited, so that it remains challenging to achieve multicolor CTE‐RTP due to the difficulty in tailoring the clustering state of the atoms with lone pair electrons. The authors report that phosphorescence resonance energy transfer (PRET) can occur in the CTE‐RTP system, which enables fine‐tuning the color of the CTE‐RTP. Since the CTE‐RTP is a broad band in the range of 400–700 nm, and the dipole orientations are diverse in the CTE material, PRET can always occur between the CTE‐RTP and arbitrary fluorescent dyes to obtain delayed fluorescence ranging from green to near infrared. Because the lifetime of the delayed fluorescence depends on their molecular structure, dynamic afterglow can be facilely achieved in the ensemble of a PRET‐CTE‐RTP system, making it very appealing in anticounterfeiting.