Journal
CHEMICAL SCIENCE
Volume 12, Issue 23, Pages 8199-8206Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc01394g
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Funding
- National Key R&D Program of China [2017YFA0700503]
- Fundamental Research Funds for the Central Universities [14380221]
- National Natural Science Foundation of China [21875102, 21875104]
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This study presents a flexible solid film made of carbon dots and polyvinylpyrrolidone, with unique dynamic ultralong room temperature phosphorescence. The material achieved fully reversible photo-activation and thermal deactivation of the dynamic long afterglow, and ultra-fine URTP patterns were successfully photo-printed onto the films for time-temperature indicating logistics labels.
Stimuli-responsive films with a dynamic long afterglow feature have received considerable attention in the field of optical materials. Herein, we report the unique dynamic ultralong room temperature phosphorescence (URTP) in flexible solid films made of luminescent carbon dots (CDs) and polyvinylpyrrolidone (PVP). Impressively, fully reversible photo-activation and thermal deactivation of the dynamic long afterglow was achieved in this material, with a lifetime on-off ratio exceeding 3900. Subsequently, ultra-fine URTP patterns (resolution > 1280 dpi) with thermally sensitive retention time were readily photo-printed onto the films and utilized as time-temperature indicating logistics labels with multi-editing capacity. These findings not only enrich the library of dynamic URTP materials, but also extend the scope of the potential applications of luminescent CDs.
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