Strong ultraviolet and violet photoluminescence from Si-based anodic porous alumina films

Citation
Jh. Wu et al., Strong ultraviolet and violet photoluminescence from Si-based anodic porous alumina films, APPL PHYS A, 72(6), 2001, pp. 735-737
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
ISSN journal
0947-8396 → ACNP
Volume
72
Issue
6
Year of publication
2001
Pages
735 - 737
Database
ISI
SICI code
0947-8396(200106)72:6<735:SUAVPF>2.0.ZU;2-X
Abstract
We have investigated photoluminescence (PL) from Si-based anodic porous alu mina films formed by realtime controlled anodization of electron-beam evapo rated Al films. As-anodized samples show three strong PL bands at 295, 340, and 395 nm. These bands blueshift and their intensities decrease after the samples are annealed. When the annealing temperature increases to 1000 deg reesC, the blueshift becomes specially pronounced and meanwhile the structu res of the films develop toward crystalline Al2O3 Based on discussions on t he thermal annealing behaviors of the PL and PL excitation spectra, we sugg est that optical transitions in oxygen-related defects, F+ (oxygen vacancy with one electron) centers, are responsible for the observed ultraviolet an d violet PL.