Fig. 1: A schematic representation of thermally-stimulated dynamic organic phosphorescence.

a Energy transfer processes for phosphorescence in organic phosphors. Promoting the intersystem crossing (ISC) process (step 1) and reducing the rate of nonradiative transition (step 2) are key points for boosting phosphorescence. b Organic molecular motion model under thermal stimulus. c Presentation for influence of molecular stacking on phosphorescent behavior under thermal stimulus in previous and this works. Notably, intermolecular stacking distance and interactions along the direction of π-π stacking are usually even. The phosphorescence fades away as temperature increasing in previous work. On the contrary, there exists uneven intermolecular stacking in this work. Under thermal stimulus, the excited molecular conformations undergo deformation, thus affording the abnormally dynamic phosphorescence.