Vladimir V. Poborchii, Vitalii P. Petranovskii, Igor A. Glukhov, Andrei A. Fotiadi, Optical study of oriented double-Se8-ring clusters and luminescent Se2− anions in LTA at extremely high selenium loading density, Microporous and Mesoporous Materials, Volume 348, 2023, 112395, ISSN 1387-1811, https://doi.org/10.1016/j.micromeso.2022.112395
Optical study of oriented double-Se₈-ring clusters and luminescent Se₂⁻ anions in LTA at extremely high selenium loading density
|Author:||Poborchii, Vladimir V.1; Petranovskii, Vitalii P.2; Glukhov, Igor A.3,4;|
1National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Japan
2Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Baja California, Mexico
3Lab-STICC (UMR CNRS 6285), École Nationale d'Ingénieurs de Brest, France
4Ulyanovsk State University, 42 Leo Tolstoy Street, Ulyanovsk, 432970, Russia
5Optoelectronics and Measurement Techniques unit, University of Oulu, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 5.3 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2023020826356
|Publish Date:|| 2023-02-08
Recently, LTA-Se(1–8) samples with 1–8 Se atoms per cavity (simplified unit cell, large cavity + sodalite cage) obtained via adsorption at the temperature of ∼450 °C were reported. It was shown that single Se8 or single Se₁₂ ring are formed in the large LTA cavities, Se₈/Se₁₂ ring concentration ratio decreasing with an increase in the Se loading density. Contrary, in the present work, using Se vapour adsorption at ∼550 °C, we succeeded in encapsulation of ∼17 Se atoms per cavity (LTA-Se(17)) with a significant increase in the Se₈/Se₁₂ concentration ratio manifesting double Se₈-ring cluster formation in the most of the LTA large cavities, which is a step towards cluster crystal fabrication. According to our polarization/orientation Raman spectroscopic study of LTA-Se(17) single crystals, the orientations of the Se₈ and Se₁₂ appeared to be similar to those in previously investigated LTA-Se(1–8). Importantly, luminescent Se₂⁻ anions, oriented along the LTA 4-fold axes and located in the sodalite cages, are detected via Raman polarization/orientation dependencies of LTA-Se(17). Bright Se₂⁻ light emission with a maximum at ∼1.56 eV and vibronic structure is observed in the 1.3–1.8 eV spectral range. We show that the anions experience a compression in LTA which is slightly relaxing with a decrease in temperature producing an anomalous Raman band downshift. The compression of Se₂⁻ in LTA is weaker/stronger than that in sodalite/cancrinite, luminescence band photon energy depending on its strength. High concentration of regularly arranged Se₂⁻ in LTA suggests considering LTA-Se(17) as an important novel light-emitting material.
Microporous and mesoporous materials
|Pages:||1 - 7|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
114 Physical sciences
213 Electronic, automation and communications engineering, electronics
I.A.G. kindly acknowledges for the support from Ministry of Science and Higher Education of the Russian Federation (075-15-2021-581). A.A.F. is supported by the European Union's Horizon 2020 research and innovation programme (H2020-MSCA–IF–2020, #101028712).
© 2023 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).