Figure 50 Illustration of the self-healing process of the photocured
polymer.
Graphene quantum dots (GQDs) have important applications in photovoltaic
devices, especially as emission layers in light-emitting diodes (leds)
due to some merits such as outstanding photoluminescence properties, low
toxicity, good biocompatibility, good electron transport capacity, and
excellent thermal conductivity.[182-186] However,
GQDs usually suffer from serious fluorescence quenching in aggregates
and the solid state due to easy agglomeration and aggregation-induced
quenching, which seriously restrict their practical
applications.[187] For this reason, our group
report a work which constructed the blue-emitting
reduced graphene oxide quantum
dot (rGOQD)-based light emitting diodes (LEDs) with efficient solid
state emission by UV photolithography,[188] as
shown in Figure 51. In this work, preparing rGOQDs by the in situ
photoreduction of graphene oxide quantum dot (GOQDs), preparation of the
rGOQD/photoresist patterns, and the in situ photoreduction of GO in the
aforementioned photoresist to rGO were achieved simultaneously. The PL
spectrum for rGOQDs prepared by UV photolithography is observed to be
blueshifted with a narrow FWHM compared to GOQDs, which leads to the
fabrication of monochromatic blue-emitting devices.