Abstract
Developing ultralong organic phosphorescence (UOP) materials with smart response to external stimuli is of great interest in photonics applications, whereas the manipulation of molecular stacking on tuning such dynamic UOP is still a formidable challenge. Herein, we have reported two polymorphs with distinct photoactivated dynamic UOP behavior based on a pyridine derivative for the first time. Our experiment revealed that the dynamic UOP behavior including photoactivation and deactivation feature is highly dependent on irradiation intensity and environmental atmosphere. Additionally, given the unique dynamic UOP feature, these phosphors have been successfully applied to phosphorescence-dependent molecular logic gate and timing data storage. This result not only paves a way to design smart functional materials but also expands the scope of the applications on organic phosphorescence materials.
Highlights
Stimuli-responsive materials, that is, smart materials, whose physical properties can be controllably tuned by external stimuli, such as heat, light, pressure, and solvent, are of typical interest because of their promising potential applications [1, 2]
The isosurface with the same isovalue (0.008) in PyCz-N is much larger than that in PyCz-B, indicating the stronger intermolecular interactions. These results indicated that the weaker π-π interactions caused by long π-π distance may account for faster dynamic ultralong organic phosphorescence (UOP) in PyCz-B
We have developed two crystalline polymorphs of PyCz molecule, which showed distinct dynamic UOP behaviors owing to the different molecular stacking in crystal
Summary
Stimuli-responsive materials, that is, smart materials, whose physical properties can be controllably tuned by external stimuli, such as heat, light, pressure, and solvent, are of typical interest because of their promising potential applications [1, 2]. Despite great potentials in practical applications, it remains a formidable challenge to develop such smart materials so far. Crystallization is essential to such phenomenon, implying the importance of molecular stacking on dynamic UOP. Molecular stacking has been proved to be effective in manipulating luminescent properties of organic materials in solid state [49,50,51,52].
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