Fig. 4: Vertically stacked GQD/h-BN layers with h-BN barriers.
From: Blue emission at atomically sharp 1D heterojunctions between graphene and h-BN
a Schematic of the preparation process for two kinds of stacked GQD/h-BN films. b PL spectra of stacked GQD/h-BN on a SiO2/Si substrate: a four layer stack of GQD/h-BN films (4L GQD/h-BN, red spectrum), 4L GQD/h-BN with an additional h-BN intercalation layer between each GQD/h-BN film (4L GQD/h-BN with h-BN, blue spectrum), and a single layer of GQD/h-BN film (black spectrum, same as the red spectrum in Fig. 2d). c Schematic of the nonradiative charge transfer between GQDs in adjacent layers.
