Abstract
Reportedly, Aggregation Induced Emission (AIE) from Carbon Dots (CDs) is mainly induced by hydrophobic interactions. Herein, we report AIE from pristine CDs that are predominantly hydrophilic. A multistage purification protocol was employed to separate the pristine CD sample from byproducts and CD mixture. At neutral pH, the aggregated CDs exhibit a large Stokes shift with absorption maxima at 405 nm and emission in the yellow region (λmax- 535 nm) which decays mono-exponentially with a time constant of 4.03 ns. The AIE from CD quenches on moving towards the acidic region. Significant changes in the UV–visible absorption and emission spectrum are seen on increasing the pH towards alkaline medium. While the pH-induced changes in the acidic medium are reversible in nature, the emission turns blue (λmax ~ 430 nm) in alkaline medium and the process is irreversible. Microscopic and Light Scattering studies suggest pH triggered disintegration of aggregates in alkaline medium.
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