Visible emission of single-wall carbon nanotubes formed in micro-channels of zeolite crystals

• Published in: Journal of luminescence Vol. 97; no. 3; pp. 161 - 167
• Main Authors: Nagasawa, N., Sugiyama, H., Naka, N., Kudryashov, I., Watanabe, M., Hayashi, T., Božović, I., Božović, N., Li, G., Li, Z., Tang, Z.K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-06-2002; Elsevier
• Subjects: Carbon nanotubes; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Nanotubes; Optical absorption; Optical non-linearity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Zeolite; Carbon nanotubes; 78.67.Ch; 81.07.De; Zeolite; Optical non-linearity; Optical absorption; Interband transitions; Photoluminescence; Optical transition; Experimental study; Zeolites; Selection rules; Energy-level transitions; Polarized radiation; Laser radiation; Illumination; Excitation spectrum; Non linear effect
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/S0022-2313(02)00219-3

Emission spectroscopy is performed to study the optical transitions between electronic bands of SWCNs formed in AlPO
4−5 (AFI) crystal. Strong visible emission is observed under laser light illumination at room temperature. The emission is excited by the light polarized along the
c-axis and its polarization is also along this direction. On the other hand, non-linear emission is observed under the resonant excitation of the lowest absorption band of SWCNs. The emission is excited by the light polarized along the
c-axis, but it shows the polarization perpendicular to the
c-axis. The polarization character is discussed on the basis of the selection rules of the optical transitions predicted by the full line-group symmetry of SWCNs.