Electrons in feldspar II: a consideration of the influence of conduction band-tail states on luminescence processes

Nigel Poolton, K. B. Ozanyan, A. S. Murray, J. Wallinga

Research output: Contribution to journalArticlepeer-review

117 Citations (SciVal)

Abstract

Most natural feldspars contain many charged impurities, and display a range of bond angles, distributed about the ideal. These effects can lead to complications in the structure of the conduction band, giving rise to a tail of energy states (below the high-mobility conduction band) through which electrons can travel, but with reduced mobility: transport through these states is expected to be thermally activated. The purpose of this article is twofold. Firstly, we consider what kind of lattice perturbations could give rise to both localized and extended conduction band-tail states. Secondly, we consider what influence the band tails have on the luminescence properties of feldspar, where electrons travel through the sample prior to recombination. The work highlights the dominant role that 0.04–0.05-eV phonons play in both the luminescence excitation and emission processes of these materials. It also has relevance in the dating of feldspar sediments at elevated temperatures.
Original languageEnglish
Pages (from-to)217-225
Number of pages9
JournalPhysics and Chemistry of Minerals
Volume29
Issue number3
DOIs
Publication statusPublished - Apr 2002

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