Fig. 4: Optical properties of CDs@SiO2. | Nature Communications

Fig. 4: Optical properties of CDs@SiO2.

From: Ultralong lifetime and efficient room temperature phosphorescent carbon dots through multi-confinement structure design

Fig. 4

a Absorption, photoluminescence excitation, fluorescence emission, and phosphorescence emission spectra of CDs@SiO2-600. b Phosphorescent two-dimensional excitation-emission plot of CDs@SiO2-600. Emission intensity rises with the color changing from blue to green and to red. c CIE coordinates of the fluorescence emission and phosphorescence of CDs@SiO2-600. d Photographs of CDs@SiO2-600 powders under sunlight, excited with 254 nm UV lamp, and after switching off UV. e Time-resolved phosphorescence decay and fitting curve (red line) of the emission bands at 464 nm with 260 nm excitation. f Temperature-dependent time-resolved phosphorescence spectra of CDs@SiO2-600. g EPR spectra of CDs@SiO2-400, CDs@SiO2-600, and CDs@SiO2-700.

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