Photocontrolled pure organic room temperature phosphorescent supramolecular luminescent materials have large Stokes shift and long life, and have been widely concerned in the fields of biological imaging, anti-counterfeiting ink and optoelectronic devices.

In the recent research, professor Yu Liu 's team reported solid supramolecular bromonaphthylpyridinium polymers (P-BrNp), which exhibit tunable phosphorescence emission in the amorphous state enabled by sulfobutylether-β-cyclodextrin (SBE-β-CD) and diarylethene derivatives. The monomer BrNp gave single fluorescence emission at 490 nm, while an apparent room-temperature phosphorescence (RTP) at 550 nm emerged for P-BrNp copolymers with various feed ratios. Through fluorescence-phosphorescence dual emission, P-BrNp-0.1 displayed an ultrahigh white-light emission quantum yield of 83.9 %. Moreover, the subsequent assembly with SBE-β-CD further enhanced the phosphorescent quantum yield of P-BrNp-0.1 from 64.1 % to 71.3 %, accompanied by the conversion of photoluminescence emission from white to yellow. Diarylethene monomers were introduced as photoswitches to realize reversible RTP emission, which can be used in switchable data encryption and multifunctional writing ink. The polymer showed polymerization induced luminescence characteristics, resulting in fluorescence at 425 nm and phosphorescent double emission at 550 nm, and it was shown in the white light area in the CIE diagram, wherein P-BrNp-0.1 showed an ultra-high white light quantum yield of 83.9%. Relevant achievements were published in Angew. Chem. Int. Ed., DOI: 10.1002/anie.202213097.