Room-temperature PL spectra of NPs in hexane. Si (A), Si-C18H37 (B), C (C), C-C18H37 (D) NPs in hexane collected for an excitation of the solution volume in the bottom and in the center. The spectra in (B) and (D) were vertically stacked for clearness. The insets in (B) and (D) show, respectively, red PL of Si-C18H37 and orange PL of C-C18H37 NPs. Excitation energy is 2.54 eV.
Ryabchikov et al. Nanoscale Research Letters 2012 7:365 doi:10.1186/1556-276X-7-365