Electronic State Characterization of TiO2Ultrafine Particles by Luminescence Spectroscopy

Titania nanoparticles synthesis in mesoporous molecular sieve MCM-41

“…Excitation is made using 359 nm wavelength. The emission peak at 425 nm could be assigned to the bandto-band transition of free excitons (self-trapped excitons) localized on octahedral TiO 2 nanoparticles [26][27][28][29]. Peak at 402 nm could be associated with free exciton emission of anatase TiO 2 nanoparticles.…”

Synthesis of silica powders by pressured carbonation

“…Ultrafine metal and oxide particles find wide applications because they exhibit novel physical and chemical properties that markedly differ from those of bulk materials [1][2][3][4].…”

Photoluminescence properties of Tb2O3 embedded in the TiO2 nanocrystals

“…Since the resolution of our time resolved spectroscopic system was 5 ns, the lifetime of broad emission centered at 435 nm was assumed to be sub-nano second. It was reported that the broad band centered at 435 nm is due to the free excitons of the titania nanoparticles [13,14], and the broad emission bands at 535 and 650 nm are attributed to oxygen vacancy levels [12]. Since the emissions radiated by the recombination of free excitons disappear within several nanoseconds, these signals cannot be detected by photon-counting system (PC mode).…”