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.