Remarkable improvements of photoluminescence (PL) efficiency together with large blueshift of PL peak wavelength have been achieved by electrochemical oxidation. It is known from Fourier transform infrared (FT-IR) measurements that the SiO2 covering on pore walls has discontinuities where the surface states are terminated by hydrogen. Dramatic degradation of luminescence transitions in anodically oxidized PSL, due to thermal hydrogen desorption, indicates the importance of hydrogen in electrochemical surface passivation.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics