Dynamics of the deep red Fe3+ photoluminescence emission in feldspar

Amit Kumar Prasad*, Mayank Jain

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    We present here new characteristics of the Fe3+ emission in feldspar using a combination of site/energy-selective spectroscopy and time-resolved photoluminescence at cryogenic temperatures. Although the variation in the peak energy of Fe3+ emission has been known to vary across feldspar samples depending on the composition and structure, it has never shown before that this emission can vary dynamically even within a single sample. We show that a strong excitation-energy dependent emission (EDE) occurs in Fe3+ for non-resonant excitation at cryogenic temperatures; this characteristic can be exploited for site discrimination within a complex feldspar sample. The radiative relaxation in Fe3+ (4T16A1) is shown to be a dynamic process depending on whether the ion is excited using resonant or non-resonant transition. We suggest that during resonant excitation, the excited state of Fe3+ undergoes a slow energy-transfer, possibly a spin-lattice interaction, a process that leads to a non-first order effect in the radiative relaxation process.
    Original languageEnglish
    JournalJournal of Luminescence
    Pages (from-to)462-469
    Publication statusPublished - 2018


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