Júlia Carina Orfão Costa , Fernando Fabris , Daniel Rettori , Ana Paula de Azevedo Marques , Francielle G. Teixeira , Nancy K. Umisedo , Matheus Cavalcanti dos Santos Nunes , Neilo Marcos Trindade , Elisabeth Mateus Yoshimura , Ali Francisco García-Flores , Makaiko Chithambo , Roseli Künzel
{"title":"Luminescence and structural properties of annealed and natural blue and green Kyanite","authors":"Júlia Carina Orfão Costa , Fernando Fabris , Daniel Rettori , Ana Paula de Azevedo Marques , Francielle G. Teixeira , Nancy K. Umisedo , Matheus Cavalcanti dos Santos Nunes , Neilo Marcos Trindade , Elisabeth Mateus Yoshimura , Ali Francisco García-Flores , Makaiko Chithambo , Roseli Künzel","doi":"10.1016/j.jlumin.2025.121506","DOIUrl":null,"url":null,"abstract":"<div><div>Kyanite (<figure><img></figure>) is an aluminum silicate with a triclinic crystal structure and occurs naturally in various colors due to trace impurities. This study evaluates the structural and luminescent properties of natural and annealed, at 1100 <sup><em>o</em></sup>C for 1 hour, green and blue kyanite samples. The natural and annealed samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption, photoluminescence (PL), thermogravimetric analysis (TGA), thermoluminescence (TL), and optically stimulated luminescence (OSL). X-ray fluorescence (XRF) analysis identified several impurities, including Fe, Ca, Ti, V, and Cr, with distinct concentrations in the blue and green samples. XRD, FTIR, and Raman results confirmed the preservation of the triclinic structure after annealing, with minor distortions attributed to changes in structural order. The optical absorption data revealed significant differences between blue and green samples, particularly in the iron-related charge transfer bands. <figure><img></figure> emissions observed in the PL spectra appeared more prominently in blue kyanite and showed high sensitivity to thermal treatment. The TL glow curves exhibited a profile with emission from 300 to 400 K for all the samples. The results indicate that annealing increases the OSL signal and induces a faster decay profile, suggesting that the thermal treatment contributes to the creation or activation of optically active trapping centers. The outcomes highlight the influence of trace impurity type, oxidation states, and concentration on the luminescent behavior of kyanite, supporting its potential applications in radiation dosimetry, luminescence dating, and optical sensing technologies.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121506"},"PeriodicalIF":3.6000,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Luminescence","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022231325004466","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Kyanite () is an aluminum silicate with a triclinic crystal structure and occurs naturally in various colors due to trace impurities. This study evaluates the structural and luminescent properties of natural and annealed, at 1100 oC for 1 hour, green and blue kyanite samples. The natural and annealed samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption, photoluminescence (PL), thermogravimetric analysis (TGA), thermoluminescence (TL), and optically stimulated luminescence (OSL). X-ray fluorescence (XRF) analysis identified several impurities, including Fe, Ca, Ti, V, and Cr, with distinct concentrations in the blue and green samples. XRD, FTIR, and Raman results confirmed the preservation of the triclinic structure after annealing, with minor distortions attributed to changes in structural order. The optical absorption data revealed significant differences between blue and green samples, particularly in the iron-related charge transfer bands. emissions observed in the PL spectra appeared more prominently in blue kyanite and showed high sensitivity to thermal treatment. The TL glow curves exhibited a profile with emission from 300 to 400 K for all the samples. The results indicate that annealing increases the OSL signal and induces a faster decay profile, suggesting that the thermal treatment contributes to the creation or activation of optically active trapping centers. The outcomes highlight the influence of trace impurity type, oxidation states, and concentration on the luminescent behavior of kyanite, supporting its potential applications in radiation dosimetry, luminescence dating, and optical sensing technologies.
期刊介绍：
The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid.
We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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