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. 2019 Nov 11;58(46):16445-16450.
doi: 10.1002/anie.201908567. Epub 2019 Sep 26.

Crystal-State Photochromism and Dual-Mode Mechanochromism of an Organic Molecule with Fluorescence, Room-Temperature Phosphorescence, and Delayed Fluorescence

Lili Huang  1 , Lei Liu  1 , Xianjiang Li  2 , Huan Hu  1 , Mingxing Chen  3 , Qingyuan Yang  1 , Zhiyong Ma  1 , Xinru Jia  3
Affiliations

Crystal-State Photochromism and Dual-Mode Mechanochromism of an Organic Molecule with Fluorescence, Room-Temperature Phosphorescence, and Delayed Fluorescence

Lili Huang et al. Angew Chem Int Ed Engl. .

Abstract

A D-A-D' type pure organic molecule, named ODFRCZ, has unique triple-emission character covering fluorescence, phosphorescence, and delayed fluorescence (DF). The phosphorescence of ODFRCZ has a rather long lifetime of about 350 ms at room temperature. One dimer of ODFRCZ with enhanced parallel molecular packing acts more effectively to prompt ISC processes, which further generates room-temperature phosphorescence (RTP), owing to the larger transition dipole moment and closer energy level between S1 and Tn . ODFRCZ is a rare example of an organic RTP molecule that shows dual-stimuli responsiveness of dual-mode mechanochromism (fluorescence red-shift and RTP/DF on-off switch) and reversible crystal-state photochromism. This work may broaden the knowledge for stimuli-responsive RTP organic molecules and lay the foundation for their wide-scale applications.

Keywords: dimers; mechanochromism; photochromism; room-temperature phosphorescence.

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