The surface luminescence of silica nanospheres depending on different excitation wavelengths and accompanied photochemical reactions

Two-step excitation structure changes of luminescence centers and strong tunable blue emission on surface of silica nanospheres

“…As the lowest excitation band of dioxasilyrane and silanone (T 1 band) does not appear in both optical absorption spectra and 3D fluorescence spectra, it should be generated in photochemical reaction involving following process (Yang et al 2013):…”

“…T 1 SiÀSi ð Þ Similarly, the lowest excitation band of silanone and ODCI does not appear in both optical absorption spectra and 3D fluorescence spectra. It should be generated in photochemical reaction involving following process (Yang et al 2013 The absence of T 1 band indicates the generation process of ODCI defects. It involves an interconversions between silanones and ODCIs (Skuja 1998):…”

“…The miniaturization down to nanoscale introduces intrinsic peculiar properties, such as bright visible photoluminescence under ultraviolet excitation (Ma et al 2012), potentially promising for use of silica nanoparticles as medical nanoprobes or photoelectronic devices without the need of doping with extrinsic fluorophores (Yang et al 2013). The photoluminescence of amorphous nanosilica are expected to benefit from plenty of emission-related structure defects (Vaccaro et al 2011).…”