Strong visible photoluminescence from SiO2 nanotubes at room temperature

Citation
Hj. Chang et al., Strong visible photoluminescence from SiO2 nanotubes at room temperature, APPL PHYS L, 78(24), 2001, pp. 3791-3793
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
78
Issue
24
Year of publication
2001
Pages
3791 - 3793
Database
ISI
SICI code
0003-6951(20010611)78:24<3791:SVPFSN>2.0.ZU;2-G
Abstract
The optical studies of SiO2 mesoporous materials with hierarchical tubules- within-tubule structure have been investigated by photoluminescence and Fou rier-transform infrared transmittance (FTIR). Our results suggest that the radiative intensity can be strongly enhanced by annealing the samples in N- 2 environment. From the FTIR spectra, we have pointed out that the origin r esponsible for the strong emission is Si-OH complexes located on nanotube s urface. It has been observed that after turning off the pumping laser, the photoluminescence signal of SiO2 nanotubes can persist for several seconds, which is much longer than that of most materials performed under similar c onditions. We have round that the decay of the photoluminescence signal is due to the quantum tunneling process. These are triplet and singlet states of Si-OH complexes that are responsible for the observed persistent photolu minescence. (C) 2001 American Institute of Physics.