Strong Visible and Near-Infrared Cathodoluminescence in Alkali Feldspar

ABSTRACT

In this study, cathodoluminescence (CL) spectroscopy at direct current and alternating current under the sample temperature condition of 40–293 K using different modulation frequencies is presented for alkali feldspar from the Dartmoor granite (UK). These feldspars contain strain-controlled lamellar crypto- and microperthites that are cross-cut by strain-free deuteric microperthites. The CL spectra of the alkali feldspar at room and low temperature confirm that the observed emission peaked at ∼460 nm could be associated with Al-O⁻-Al or Ti impurity centers, yellow emission ∼560 nm could be associated with the presence of the centers such as radiation-induced defect centers, and ∼756 nm emission could be associated with the Fe³⁺ impurity center on T₁ and T₂ sites. The consequence of their association is to produce different luminescence properties such as intensity, peak wavelength, and band shape.

KEYWORDS:

• Cathodoluminescence
• Fe³⁺
• Feldspars
• Mn²⁺

ACKNOWLEDGEMENTS

We thank all referees for providing constructive comments and help in improving the contents of this article.

Notes

Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/lstl.