Fig. 5: Temperature dependence of the PL properties of the CDs.
From: Electron–phonon coupling-assisted universal red luminescence of o-phenylenediamine-based carbon dots
a PL spectrum at 77 K fitted by the sum of six Gaussian peaks, with separate P1 to P6 components. The phonon sidebands are shown in pink. b Emission peak energies and c the line widths of P1, P3, and P5 as a function of temperature. d PL spectra at 4 K with different excitation intensities. e PL intensity as a function of power density. f Comparison of the PL spectra of pulsed and continuous light excitation. g PL spectrum of R-CDs with the abscissa as the wavenumber. h Raman spectra of R-CDs excited at 473 and 633 nm at 77 K. i Raman spectra of CDs at 633 nm at different temperatures from 77 to 298 K
