Abstract
Chabazite-Ca deposited on dacite laccolith from Osódi Hill, Dunabogdány, Hungary, exhibited bluish-white luminescence under ultraviolet (UV) light. The photoluminescence (PL) and optical excitation spectra of chabazite-Ca were obtained at 300 K. The PL spectrum under 300-nm excitation consists of (1) a Ce3+ band with a peak at 340 nm, (2) a broad main band with a peak at 453 nm and (3) five narrow bands at 592, 616, 650, 700 and 734 nm due to Eu3+. The main band is spread over the entire visible-wavelength region. The excitation spectrum obtained by monitoring green luminescence at 520 nm consists of a band at wavelengths shorter than 200 nm and an extremely broad band with a peak at 385 nm. The extremely broad band is spread over not only the UV region but also the blue region. The features of PL and excitation spectra suggest that the origin of bluish-white luminescence is luminescent organic matter incorporated into chabazite-Ca crystals during growth.
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The authors sincerely thank Professor Tamás G. Weiszburg of Eötvös L. University, Budapest and his staff for the fieldwork conducted. The original manuscript was improved substantially after helpful comments and suggestions from Michael Gaft and an anonymous reviewer.
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Kobayashi, S., Aierken Sidike & Yamashita, N. Luminescence spectra of chabazite-Ca, a zeolite mineral. Phys Chem Minerals 39, 465–470 (2012). https://doi.org/10.1007/s00269-012-0500-5
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DOI: https://doi.org/10.1007/s00269-012-0500-5