Multicolour emission is realized in chlorine-doped GQDs (CI-GQDs) prepared by a facile hydrothermal method using fructose and hydrochloric acid as source materials. The average diameter of a CI-GQD is about 5.4 nm with 2 at% CI. The emission colour of the CI-GQDs can be tuned successively from blue to white, orange, green and red simply by varying the excitation wavelength between 300 and 600 nm. The multicolour emission from the CI-GQDs can be attributed to CI doping, which introduces additional energy levels between C π and C π*. The multicolour CI-GQDs should find applications in bioimaging and optoelectronic devices.
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