NOVELTY - The method comprises performing a direct combustion of a liquid aromatic compound in air to form carbon nanoparticles. The carbon nanoparticles have an average size of 10-30 nm, a flat and round morphology, a Brunauer-Emmett-Teller surface area of 40-50 m2/g, a point absorption pore volume at p/p0=0.99 of 0.09-0.10 cm3/g, a t-plot micro pore volume of 0.01-0.02 cm3/g, and a Barret-Joyner-Halenda desorption average pore diameter (4V/A) of 8-10 nm. The carbon nanoparticles are operable for emitting blue light having a wavelength of 425-550 nm and a quantum yield of 12-13%.    USE - The method is useful for synthesizing carbon nanoparticles comprising carbon, oxygen and hydrogen at room temperature, where the carbon nanoparticles are useful in a carbon nanoparticle material that is useful in an application consisting of energy storage, electronic devices such as organic light emitting diodes and solar cells, bio-imaging, imaging for identification, authentication, catalyst support and/or biological applications and the energy storage is useful in a capacitor, in an electrode of a battery and/or in an electrode in of a fuel cell (all claimed), where the carbon nanoparticles are fluorescent carbon nanoparticles.    ADVANTAGE - The method is capable of efficiently, economically and simply synthesizing the carbon nanoparticles with improved fluorescence quantum yield thus strongly emitting photoluminescence in the visible light when excited with a wide range of wavelength.    DETAILED DESCRIPTION - The method comprises performing a direct combustion of a liquid aromatic compound in air to form carbon nanoparticles. The carbon nanoparticles have an average size of 10-30 nm, a flat and round morphology, a Brunauer-Emmett-Teller surface area of 40-50 m2/g, a point absorption pore volume at p/p0=0.99 of 0.09-0.10 cm3/g, a t-plot micro pore volume of 0.01-0.02 cm3/g, and a Barret-Joyner-Halenda desorption average pore diameter (4V/A) of 8-10 nm. The carbon nanoparticles are operable for emitting blue light having a wavelength of 425-550 nm and a quantum yield of 12-13% when the nanoparticles are excited using an excitation wavelength of 275-375 nm. The step of direct combustion comprises a confined or controlled combustion of the aromatic compound. An amount of carbon, oxygen and hydrogen present in the carbon nanoparticles is 94-96 wt.%, 3-4 wt.% and 2-3 wt.% respectively. An INDEPENDENT CLAIM is included for carbon nanoparticles.    DESCRIPTION OF DRAWING(S) - The diagram shows a transmission electron microscopy image of carbon nanoparticles.