Hi
Usually, AIQ has an effect on the emission spectrum. What about absorption?
Does aggregation-induced quenching (AIQ) impact on the absorption of CQDs?
Yes, aggregation-induced quenching (AIQ) can have a significant impact on the absorption of colloidal quantum dots (CQDs). AIQ refers to the phenomenon where the aggregation or clustering of nanoparticles leads to a decrease in their fluorescence or absorption intensity. This can occur due to various reasons, including changes in the electronic structure, interparticle interactions, and alterations in the local environment of the CQDs.
In the case of absorption, when CQDs aggregate, their close proximity can lead to the formation of energy transfer pathways that promote non-radiative relaxation processes. As a result, the absorption of light by the aggregated CQDs may decrease, leading to a quenching of absorption intensity. This phenomenon is particularly relevant when studying the optical properties of CQDs in solution or in solid-state films.
To mitigate AIQ and preserve the absorption properties of CQDs, researchers often focus on strategies to prevent or reduce aggregation. These strategies may include surface modification of the CQDs with functional ligands, optimizing the solvent and concentration conditions, and controlling the synthesis parameters to minimize particle aggregation.
It's important to note that the impact of AIQ on CQDs' absorption can vary based on factors such as CQD size, surface chemistry, aggregation degree, and the specific application. Therefore, careful characterization and control of aggregation effects are essential when working with CQDs for optical and optoelectronic applications.
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