Fig. 2 | Nature Communications

Fig. 2

From: Observation of a phonon bottleneck in copper-doped colloidal quantum dots

Fig. 2

Optical properties of Cu-doped QDs. a Absorption spectra of CdSe (blue) and Cu:CdSe (red) QDs dispersed in heptane. Exciton (X) and charge-transfer (CT) bands are labeled, which are associated with transitions from the valence band (VB) edge and intragap copper state (Cu*), respectively, to the conduction band (CB) edge (inset). b Photoluminescence (PL) spectra of CdSe (blue) and Cu:CdSe (red) QDs excited at 400 nm. The latter is also plotted in logarithmic scale to show both X and CT band emissions for Cu:CdSe QDs (inset)

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