Photoluminescence and light reabsorption in SiC quantum dots embedded in binary-polyelectrolyte solid matrix

摘要

We report photoluminescence (PL) and light reabsorption in the SiC quantum dots (QDs) embedded in the binary poly(allylamine hydrochloride)-sodium poly(styrene sulfonate) polyelectrolytes solid matrix. The emission maximum wavelength can be tuned over a wide blue-violet spectral region indicating a PL origin of quantum confinement. The emission maximum exhibits a red shift with increasing concentration of the QDs in the polyelectrolytes matrix. The analysis shows that this shift stems from reabsorption of PL of smaller SiC QDs by larger ones in the matrix. We find that deposition of Ag nanoparticles on the surface of the solid matrix can dramatically reduce light reabsorption owing to surface plasmon-induced concentration of incident light. Additionally, the PL intensity was enhanced by a factor of 1.4. Our results open the possibility of the SiC QDs-based solid blue-UV light emitters for applications in full-solid-state lighting and display.