Luminescent centres F and F<SUP>+</SUP> in α-alumina detected by cathodoluminescence technique

作     者：Ghamnia, M Jardin, C Bouslama, M 

作者机构：Univ Oran Es Senia Fac Sci Dept Phys LSMC Oran 31100 Algeria Univ Lyon 1 Dept Phys Mat F-69622 Villeurbanne France 

出 版 物：《JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA》 (电子光谱学及相关现象杂志)

年 卷 期：2003年第133卷第1-3期

页      面：55-63页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0703[理学-化学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：F F+ centres cathodoluminescence (CL) alpha-Al2O3 defects 

摘      要：alpha-Al2O3(0 0 0 1) single crystals have been investigated using cathodoluminescence (CL) technique and Auger electron spectroscopy (AES). The main luminescent centres such as F, F+ or Cr3+ activated during the irradiation of crystals by electrons of 4 keV energy were detected and discussed. CL intensity is shown to be highly dependent on both synthesis conditions and thermal annealing treatments. The air-annealing treatments at high temperature (1700degreesC reduce considerably the concentration of defects inducing a constant evolution of CL-signal of the band located at 330 nm attributed to F+ defects. On the contrary, crystals not annealed enough display a large increase of the F+ CL-signal during the electron irradiation. The F+ emission is also observed to be very sensitive to electron dose. (C) 2003 Elsevier B.V. All rights reserved.