Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties
Novel multicomponent glasses with nominal compositions of (50−x)MoO<sub>3</sub>:xWO<sub>3</sub>:25La<sub>2</sub>O<sub>3</sub>:25B<sub>2</sub>O<sub>3</sub>, x = 0, 10, 20, 30, 40, 50 mol% doped with 3 mol % Eu<sub>2</sub...
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2024-10-01
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| author | Lyubomir Aleksandrov Margarita Milanova Aneliya Yordanova Reni Iordanova Kenji Shinozaki Tsuyoshi Honma Takayuki Komatsu |
| author_facet | Lyubomir Aleksandrov Margarita Milanova Aneliya Yordanova Reni Iordanova Kenji Shinozaki Tsuyoshi Honma Takayuki Komatsu |
| author_sort | Lyubomir Aleksandrov |
| collection | DOAJ |
| description | Novel multicomponent glasses with nominal compositions of (50−x)MoO<sub>3</sub>:xWO<sub>3</sub>:25La<sub>2</sub>O<sub>3</sub>:25B<sub>2</sub>O<sub>3</sub>, x = 0, 10, 20, 30, 40, 50 mol% doped with 3 mol % Eu<sub>2</sub>O<sub>3</sub> were prepared using a conventional melt-quenching method. Their structure, thermal behavior and luminescent properties were investigated by Raman spectroscopy, differential thermal analysis and photoluminescence spectroscopy. The optical properties of the glasses were investigated by UV–vis absorption spectroscopy and a determination of the refractive index. Physical parameters such as density, molar volume, oxygen molar volume and oxygen packing density were determined. The glasses are characterized by a high glass transition temperature. Raman analysis revealed that the glass structure is built up mainly from tetrahedral (MoO<sub>4</sub>)<sup>2−</sup> and (WO<sub>4</sub>)<sup>2−</sup> units providing Raman bands of around 317 cm<sup>−1</sup>, 341–352 cm<sup>−1</sup>, 832–820 cm<sup>−1</sup> and 928–935 cm<sup>−1</sup>. At the same time, with the replacement of MoO<sub>3</sub> with WO<sub>3</sub> some fraction of WO<sub>6</sub> octahedra are produced, the number of which increases with the increasing WO<sub>3</sub> content. A strong red emission from the <sup>5</sup>D<sub>0</sub> level of Eu<sup>3+</sup> ions was registered under near-UV (397 nm) excitation using the <sup>7</sup>F<sub>0</sub> → <sup>5</sup>L<sub>6</sub> transition of Eu<sup>3+</sup>. Photoluminescence (PL) emission gradually increases with increasing WO<sub>3</sub> content, evidencing that WO<sub>3</sub> is a more appropriate component than MoO<sub>3</sub>. The integrated fluorescence intensity ratio R (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub>/<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub>) was calculated to estimate the degree of asymmetry around the active ion, suggesting a location of Eu<sup>3+</sup> in non-centrosymmetric sites. All findings suggest that the investigated glasses are potential candidates for red light-emitting phosphors. |
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| spelling | doaj-art-64a425fe45364ab4805fe516b79497342025-08-20T02:16:54ZengMDPI AGMolecules1420-30492024-10-012919468710.3390/molecules29194687Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent PropertiesLyubomir Aleksandrov0Margarita Milanova1Aneliya Yordanova2Reni Iordanova3Kenji Shinozaki4Tsuyoshi Honma5Takayuki Komatsu6Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, G. Bonchev, str. bld. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, G. Bonchev, str. bld. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, G. Bonchev, str. bld. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, G. Bonchev, str. bld. 11, 1113 Sofia, BulgariaNational Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, JapanDepartment of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188, JapanDepartment of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188, JapanNovel multicomponent glasses with nominal compositions of (50−x)MoO<sub>3</sub>:xWO<sub>3</sub>:25La<sub>2</sub>O<sub>3</sub>:25B<sub>2</sub>O<sub>3</sub>, x = 0, 10, 20, 30, 40, 50 mol% doped with 3 mol % Eu<sub>2</sub>O<sub>3</sub> were prepared using a conventional melt-quenching method. Their structure, thermal behavior and luminescent properties were investigated by Raman spectroscopy, differential thermal analysis and photoluminescence spectroscopy. The optical properties of the glasses were investigated by UV–vis absorption spectroscopy and a determination of the refractive index. Physical parameters such as density, molar volume, oxygen molar volume and oxygen packing density were determined. The glasses are characterized by a high glass transition temperature. Raman analysis revealed that the glass structure is built up mainly from tetrahedral (MoO<sub>4</sub>)<sup>2−</sup> and (WO<sub>4</sub>)<sup>2−</sup> units providing Raman bands of around 317 cm<sup>−1</sup>, 341–352 cm<sup>−1</sup>, 832–820 cm<sup>−1</sup> and 928–935 cm<sup>−1</sup>. At the same time, with the replacement of MoO<sub>3</sub> with WO<sub>3</sub> some fraction of WO<sub>6</sub> octahedra are produced, the number of which increases with the increasing WO<sub>3</sub> content. A strong red emission from the <sup>5</sup>D<sub>0</sub> level of Eu<sup>3+</sup> ions was registered under near-UV (397 nm) excitation using the <sup>7</sup>F<sub>0</sub> → <sup>5</sup>L<sub>6</sub> transition of Eu<sup>3+</sup>. Photoluminescence (PL) emission gradually increases with increasing WO<sub>3</sub> content, evidencing that WO<sub>3</sub> is a more appropriate component than MoO<sub>3</sub>. The integrated fluorescence intensity ratio R (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub>/<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub>) was calculated to estimate the degree of asymmetry around the active ion, suggesting a location of Eu<sup>3+</sup> in non-centrosymmetric sites. All findings suggest that the investigated glasses are potential candidates for red light-emitting phosphors.https://www.mdpi.com/1420-3049/29/19/4687glassesstructureeuropiumphotoluminescencered-emitting glass materials |
| spellingShingle | Lyubomir Aleksandrov Margarita Milanova Aneliya Yordanova Reni Iordanova Kenji Shinozaki Tsuyoshi Honma Takayuki Komatsu Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties Molecules glasses structure europium photoluminescence red-emitting glass materials |
| title | Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties |
| title_full | Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties |
| title_fullStr | Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties |
| title_full_unstemmed | Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties |
| title_short | Novel Eu<sup>3+</sup>-Doped Glasses in the MoO<sub>3</sub>-WO<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System: Preparation, Structure and Photoluminescent Properties |
| title_sort | novel eu sup 3 sup doped glasses in the moo sub 3 sub wo sub 3 sub la sub 2 sub o sub 3 sub b sub 2 sub o sub 3 sub system preparation structure and photoluminescent properties |
| topic | glasses structure europium photoluminescence red-emitting glass materials |
| url | https://www.mdpi.com/1420-3049/29/19/4687 |
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