A new direction in supramolecular chemistry is to command triplet excitons for beneficial photophysical pathways such as photon upconversion, singlet fission, thermally activated delayed fluorescence, and room temperature phosphorescence (RTP). Traditionally, inorganics or organometallic compounds typically uses for triplet generator due to the heavy atom effect. By contrast, the development of purely organic RTP materials has made significant progress in recent years. However, the nature of organic solids in the triplet states is not only determined by their molecular structure, but also by numerous other factors such as molecular packing mode, intermolecular interactions, heavy-atom effects, and the vibration characteristics of surrounding molecules. Therefore, it remains a great challenge to design/prepare highly efficient RTP materials with well understood phosphorescence mechanism.
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