Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics

In this work, nano-glass ceramics constituted by SiO2–Na2O–CaO–Dy2O3 are synthesized with different contents of CaO (0–30 mol%) and Dy2O3 (0.1–4 mol%) through the melt-quenching technique at 1500 °C. The precipitation of nanocrystals occurs during the cooling stage of molten glass precursors. Depend...

Full description

Bibliographic Details
Main Authors: H. Uriel López-Herrera, J. Escorcia-García, C.A. Gutiérrez-Chavarría, V. Agarwal, V.E. Ceniceros-Orozco
Format: Article
Language:English
Published: Elsevier 2022-09-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S223878542201208X
_version_ 1818027119325741056
author H. Uriel López-Herrera
J. Escorcia-García
C.A. Gutiérrez-Chavarría
V. Agarwal
V.E. Ceniceros-Orozco
author_facet H. Uriel López-Herrera
J. Escorcia-García
C.A. Gutiérrez-Chavarría
V. Agarwal
V.E. Ceniceros-Orozco
author_sort H. Uriel López-Herrera
collection DOAJ
description In this work, nano-glass ceramics constituted by SiO2–Na2O–CaO–Dy2O3 are synthesized with different contents of CaO (0–30 mol%) and Dy2O3 (0.1–4 mol%) through the melt-quenching technique at 1500 °C. The precipitation of nanocrystals occurs during the cooling stage of molten glass precursors. Depending on CaO content, nanocrystals of cristobalite (0 mol%) or combeite (30 mol%) are grown inside the amorphous silicate phase. FTIR and XPS studies indicate that non-bridging oxygens increase with CaO due to [SiO]4 tetrahedral rupture. However, if CaO is higher than 20 mol%, the non-bridging oxygens slightly decrease due to the prevalence of combeite nanocrystals. Moreover, the addition of CaO decreases the optical bandgap (4.18–3.91 eV) and increases the Urbach energy (0.54–0.75 eV). Although PL spectra acquired at λex of 348 and 386 nm show four peaks whose intensities augment with CaO, the most prominent peaks appear at 490 (4F9/2 → 6H15/2, blue) and 577 nm (4F9/2 → 6H13/2, yellow). The decrease in the yellow to blue ratio, with an increment in CaO content, is attributed to the devitrification of glass phase. The most intense PL intensity is obtained in the nano-glass ceramic constituted of 30 mol% CaO and 1 mol% Dy2O3. This sample demonstrates excellent thermal PL stability up to 400 °C, retaining 95.2% of the initial PL value. The results indicate that these nano-glass ceramics are good candidates for their use as yellow phosphors in high-power consuming and high-temperature applications, such as LED chips and luminescent solar concentrators.
first_indexed 2024-12-10T04:42:50Z
format Article
id doaj.art-2c943457d5254563be19b5eac88ffea1
institution Directory Open Access Journal
issn 2238-7854
language English
last_indexed 2024-12-10T04:42:50Z
publishDate 2022-09-01
publisher Elsevier
record_format Article
series Journal of Materials Research and Technology
spelling doaj.art-2c943457d5254563be19b5eac88ffea12022-12-22T02:01:50ZengElsevierJournal of Materials Research and Technology2238-78542022-09-012015441557Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramicsH. Uriel López-Herrera0J. Escorcia-García1C.A. Gutiérrez-Chavarría2V. Agarwal3V.E. Ceniceros-Orozco4CINVESTAV del IPN, Unidad Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial, Ramos Arizpe 25900, Coahuila, MexicoCONACYT-CINVESTAV del IPN, Unidad Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial, Ramos Arizpe 25900, Coahuila, Mexico; Corresponding author.CINVESTAV del IPN, Unidad Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial, Ramos Arizpe 25900, Coahuila, MexicoCIICAP, UAEM, Av. Universidad 1001, Col. Chamilpa, Cuernavaca 62209, Morelos, MexicoCINVESTAV del IPN, Unidad Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial, Ramos Arizpe 25900, Coahuila, MexicoIn this work, nano-glass ceramics constituted by SiO2–Na2O–CaO–Dy2O3 are synthesized with different contents of CaO (0–30 mol%) and Dy2O3 (0.1–4 mol%) through the melt-quenching technique at 1500 °C. The precipitation of nanocrystals occurs during the cooling stage of molten glass precursors. Depending on CaO content, nanocrystals of cristobalite (0 mol%) or combeite (30 mol%) are grown inside the amorphous silicate phase. FTIR and XPS studies indicate that non-bridging oxygens increase with CaO due to [SiO]4 tetrahedral rupture. However, if CaO is higher than 20 mol%, the non-bridging oxygens slightly decrease due to the prevalence of combeite nanocrystals. Moreover, the addition of CaO decreases the optical bandgap (4.18–3.91 eV) and increases the Urbach energy (0.54–0.75 eV). Although PL spectra acquired at λex of 348 and 386 nm show four peaks whose intensities augment with CaO, the most prominent peaks appear at 490 (4F9/2 → 6H15/2, blue) and 577 nm (4F9/2 → 6H13/2, yellow). The decrease in the yellow to blue ratio, with an increment in CaO content, is attributed to the devitrification of glass phase. The most intense PL intensity is obtained in the nano-glass ceramic constituted of 30 mol% CaO and 1 mol% Dy2O3. This sample demonstrates excellent thermal PL stability up to 400 °C, retaining 95.2% of the initial PL value. The results indicate that these nano-glass ceramics are good candidates for their use as yellow phosphors in high-power consuming and high-temperature applications, such as LED chips and luminescent solar concentrators.http://www.sciencedirect.com/science/article/pii/S223878542201208XSilicateNanoglass-ceramicDy2O3LuminescenceThermal stability
spellingShingle H. Uriel López-Herrera
J. Escorcia-García
C.A. Gutiérrez-Chavarría
V. Agarwal
V.E. Ceniceros-Orozco
Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
Journal of Materials Research and Technology
Silicate
Nanoglass-ceramic
Dy2O3
Luminescence
Thermal stability
title Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
title_full Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
title_fullStr Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
title_full_unstemmed Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
title_short Influence of CaO and Dy2O3 on the structural, chemical and optical properties of thermally stable luminescent silicate nanoglass-ceramics
title_sort influence of cao and dy2o3 on the structural chemical and optical properties of thermally stable luminescent silicate nanoglass ceramics
topic Silicate
Nanoglass-ceramic
Dy2O3
Luminescence
Thermal stability
url http://www.sciencedirect.com/science/article/pii/S223878542201208X
work_keys_str_mv AT huriellopezherrera influenceofcaoanddy2o3onthestructuralchemicalandopticalpropertiesofthermallystableluminescentsilicatenanoglassceramics
AT jescorciagarcia influenceofcaoanddy2o3onthestructuralchemicalandopticalpropertiesofthermallystableluminescentsilicatenanoglassceramics
AT cagutierrezchavarria influenceofcaoanddy2o3onthestructuralchemicalandopticalpropertiesofthermallystableluminescentsilicatenanoglassceramics
AT vagarwal influenceofcaoanddy2o3onthestructuralchemicalandopticalpropertiesofthermallystableluminescentsilicatenanoglassceramics
AT vecenicerosorozco influenceofcaoanddy2o3onthestructuralchemicalandopticalpropertiesofthermallystableluminescentsilicatenanoglassceramics