Journal
DIAMOND AND RELATED MATERIALS
Volume 14, Issue 10, Pages 1705-1710Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2005.06.027
Keywords
photo-ionization; photochromism; nitrogen-vacancy center; optical properties
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In this paper it is shown that the [N-V](-) center in diamond is not photochemically stable. With intense excitation a proportion of the [N-V](-) centers in a crystal are converted to [N-V](0) centers. Two ionization processes are identified. One occurs when the center is directly excited to the first excited state. The other process is indirect and occurs when there is photo-ionization of the accompanying substitutional nitrogen centers in the crystal. The dynamics and the wavelength dependence of these processes are measured and interpreted. (c) 2005 Elsevier B.V. All rights reserved.
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