Probing luminescence centers in Na rich feldspar

Amit Kumar Prasad, Torben Lapp, Myung Ho Kook, Mayank Jain

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    Abstract

    In contrast to the detailed investigations on the dosimetric electron trap in feldspar only little has been done to understand the luminescence centers. We use a comparison of multiple spectroscopic techniques, site selective photoluminescence spectroscopy and time resolved measurements to further our understanding of the luminescence mechanisms and recombination sites, in a sample of Na rich plagioclase feldspar (oligoclase). Both the UV and violet–blue emissions show resonant excitations arising from a distribution of energy levels. We propose, contrary to the general understanding, that the green emission may not arise from Mn2+ in our sample and that photoionisation of this centre may be possible by excitation to the band tail states. The deep red emission is tied to the Fe3+, and the exponential rise in the UV excitation efficiency of this centre is discussed in the context of the band-tail model.
    Original languageEnglish
    JournalRadiation Measurements
    Volume90
    Pages (from-to)292-297
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2016
    Event9th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation - Tartu, Estonia
    Duration: 20 Sept 201525 Sept 2015
    Conference number: 9

    Conference

    Conference9th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation
    Number9
    Country/TerritoryEstonia
    CityTartu
    Period20/09/201525/09/2015

    Keywords

    • Na-feldspar
    • X-ray excited optical luminescence
    • Radioluminescence
    • Photoluminescence
    • Band-tail model

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