Amino Functionalization of Carbon Dots Leads to Red Emission Enhancement

The Journal of Physical Chemistry Letters
Evgeny V KundelevAndrey L Rogach

Abstract

The availability of carbon dots (CDots) with bright red photoluminescence (PL) would significantly broaden the range of their biological and optoelectronic applications. We present a theoretical model that predicts that amino functionalization of CDots not only shifts their PL to longer wavelengths but also preserves large oscillator strengths of the fundamental radiative transitions of CDots. The model considers the optical response of amino-functionalized CDots determined by molecule-like subunits of polycyclic aromatic hydrocarbons with one, two, or three -NH2 groups at the CDots' surface; the excited state of those subunits is characterized by strong charge separation between the amino groups and CDots' carbon core. Such a separation determines the Stokes shift of the CDots' emission, which increases with the growing amount of the amino functional groups at the CDot surface. Our model explains the experimentally observed dependence of the PL spectra of CDots on the excitation wavelength, the phenomenon well documented in the literature for nitrogen-containing CDots.

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Citations

Jun 4, 2020·Nanomaterials·Evgeniia A StepanidenkoAndrey L Rogach
Dec 13, 2019·Nanoscale·Evgeniia A StepanidenkoAndrey L Rogach
Jul 29, 2021·Analytical Methods : Advancing Methods and Applications·Yafeng DengJun Qian
Aug 6, 2021·The Journal of Physical Chemistry Letters·Jingkun YuSiyu Lu
Sep 8, 2020·The Journal of Physical Chemistry Letters·Evgeny V KundelevAndrey L Rogach
Aug 15, 2019·ACS Nano·Nikita V TepliakovIvan D Rukhlenko

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