High-Temperature Resistance Photoluminescence Carbonized Polymer Dots Through Equilibrium Bi-Confinement Effects.
basic_science · Level V
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- Record sourced from PubMed, PMID 39670707.
- Also identified by DOI 10.1002/adma.202407811.
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Abstract
Carbon dots are emerging luminescent nanomaterials that have drawn considerable attention due to their abundance, environmental friendliness, and customizable optical properties. However, their susceptibility to temperature-induced vibrational exciton changes and the tendency to thermal quenching of emission have hindered their practical applications. Here, a method is reported for achieving high-temperature photoluminescence carbonized polymer dots (CPDs) through a bi-confinement approach that involves a highly cross-linked polymer network and a rigid Al<sub>2</sub>O<sub>3</sub> matrix. As the temperature increased from 303 to 500 K, the fluorescence and phosphorescence emission intensities of CPDs@Al<sub>2</sub>O<sub>3</sub> remained virtually unchanged, with the emission duration exceeding 150 h at 500 K. Additionally, CPDs@Al<sub>2</sub>O<sub>3</sub> composites with different degrees of carbonization exhibit dynamic excitation-dependent photoluminescence properties, which can be patterned for multiple information encryption application. This work provides a concept for designing stable and luminous CPDs under harsh conditions, thus expanding their potential application range.