Abstract
GQDs decorated with europium (Eu), silver (Ag) and selenium (Se) at molar ratios of 0.1%, 0.3% and 0.5% were produced for the first time at different temperatures of 180°C, 200°C and 220°C. Surface passivation was carried out with polyethylene glycol (PEG) to increase the intensity of photoluminescence (PL) of the produced samples. The prepared quantum dots were characterized by X-Ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), transmission electron microscopy (TEM), PL and ultraviolet-visible spectroscopy. GQDs synthesized at 180°C and decorated with Se (0.3%) had maximum PL intensity along with long lasted afterglow over 90min compared with other samples. Excitation wavelength at 360nm produced maximum emission at 600-900nm and resulted in high singlet oxygen (1O 2) generation which makes it a good candidate for photodynamic therapy applications.
Published Version
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