Journal
CHEMISTRY OF MATERIALS
Volume 35, Issue 22, Pages 9799-9805Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.3c02505
Keywords
-
Ask authors/readers for more resources
By utilizing polymorph engineering, the production of both thermally activated delayed fluorescence and room-temperature phosphorescence has been regulated through a single polymorphic molecule. Thermodynamically controlled macrocrystals exhibit delayed fluorescence, while kinetically controlled microcrystals display phosphorescence.
Even though there is a vast library of self-assembled organic molecules offering practically infinite possibilities to produce thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP), obtaining both from a single candidate is a formidable challenge due to the difficulty in controlling the excited-state dynamics. Here, we demonstrate how a single polymorphic molecule with a donor-acceptor-donor (D-A-D) architecture can be used to regulate both TADF and RTP with the help of polymorph engineering. Thermodynamically controlled macrocrystals show TADF due to intermolecular charge transfer (inter-CT), which reduces the singlet-triplet energy gap (Delta ES-T), enhances reverse intersystem crossing (RISC), and boosts the delayed singlet radiative decay. The energy gap in kinetically controlled self-assembled microcrystals is greater due to larger intermolecular distance and hence weaker inter-CT. On the other hand, the presence of stronger intramolecular charge transfer (intra-CT), in addition to restricted RISC in the microcrystals, stabilizes the triplet excitons to favor RTP.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available