Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure
Whitlockite has the advantages of a low sintering temperature, high stability, and a low fabrication cost, and it is widely used as the host for luminescent material. In this study, Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6−x</sub>(PO<sub>4</sub>)<...
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2022-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/6/2177 |
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| author | Wanjuan Tang Qingfeng Guo Ke Su Haikun Liu Yuanyuan Zhang Lefu Mei Libing Liao |
| author_facet | Wanjuan Tang Qingfeng Guo Ke Su Haikun Liu Yuanyuan Zhang Lefu Mei Libing Liao |
| author_sort | Wanjuan Tang |
| collection | DOAJ |
| description | Whitlockite has the advantages of a low sintering temperature, high stability, and a low fabrication cost, and it is widely used as the host for luminescent material. In this study, Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6−x</sub>(PO<sub>4</sub>)<sub>2</sub>:xDy<sup>3+</sup> phosphor was prepared by the high-temperature solid-state method, and its structure, composition, and luminescence properties were systematically studied. The results showed that a new whitlockite type matrix was prepared by replacing Ca<sup>2+</sup> in whitlockite with monovalent and trivalent cations. The prepared phosphors belonged to a hexagonal crystal system with a particle size in the range of 5–20 μm. Under the excitation of 350 nm UV light, the samples emitted white light, and there were mainly two stronger emission peaks at 481 nm in the blue band and 573 nm in the yellow band, which correspond to the electron transitions at <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>15/2</sub> and <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> of Dy<sup>3+</sup>, respectively. The optimal doping concentration of Dy<sup>3+</sup> in Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6</sub>(PO<sub>4</sub>)<sub>2</sub> matrix was 0.03 (mol%). The main mechanism of concentration quenching in the sample was dipole–dipole energy transfer. When the temperature was 130 °C, the luminescence intensity of the samples was 78.7% of that at 30 °C, and their thermal quenching activation energy was 0.25 eV. The CIE coordinates of the sample at 30 °C were (0.2750, 0.3006), and their luminescent colors do not change with temperature. All the results indicate that Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6</sub><sub>−x</sub>(PO<sub>4</sub>)<sub>2</sub>:xDy<sup>3+</sup> phosphor is a luminescent material with good luminescence performance and thermal stability, which shows a promising application in the field of LED display. |
| first_indexed | 2024-03-09T13:27:56Z |
| format | Article |
| id | doaj.art-1f1d3107469a450ea4adba742230caee |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T13:27:56Z |
| publishDate | 2022-03-01 |
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| spelling | doaj.art-1f1d3107469a450ea4adba742230caee2023-11-30T21:20:45ZengMDPI AGMaterials1996-19442022-03-01156217710.3390/ma15062177Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite StructureWanjuan Tang0Qingfeng Guo1Ke Su2Haikun Liu3Yuanyuan Zhang4Lefu Mei5Libing Liao6School of Gemmology, China University of Geosciences, Beijing 100083, ChinaSchool of Gemmology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, ChinaWhitlockite has the advantages of a low sintering temperature, high stability, and a low fabrication cost, and it is widely used as the host for luminescent material. In this study, Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6−x</sub>(PO<sub>4</sub>)<sub>2</sub>:xDy<sup>3+</sup> phosphor was prepared by the high-temperature solid-state method, and its structure, composition, and luminescence properties were systematically studied. The results showed that a new whitlockite type matrix was prepared by replacing Ca<sup>2+</sup> in whitlockite with monovalent and trivalent cations. The prepared phosphors belonged to a hexagonal crystal system with a particle size in the range of 5–20 μm. Under the excitation of 350 nm UV light, the samples emitted white light, and there were mainly two stronger emission peaks at 481 nm in the blue band and 573 nm in the yellow band, which correspond to the electron transitions at <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>15/2</sub> and <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> of Dy<sup>3+</sup>, respectively. The optimal doping concentration of Dy<sup>3+</sup> in Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6</sub>(PO<sub>4</sub>)<sub>2</sub> matrix was 0.03 (mol%). The main mechanism of concentration quenching in the sample was dipole–dipole energy transfer. When the temperature was 130 °C, the luminescence intensity of the samples was 78.7% of that at 30 °C, and their thermal quenching activation energy was 0.25 eV. The CIE coordinates of the sample at 30 °C were (0.2750, 0.3006), and their luminescent colors do not change with temperature. All the results indicate that Ca<sub>1.8</sub>Li<sub>0.6</sub>La<sub>0.6</sub><sub>−x</sub>(PO<sub>4</sub>)<sub>2</sub>:xDy<sup>3+</sup> phosphor is a luminescent material with good luminescence performance and thermal stability, which shows a promising application in the field of LED display.https://www.mdpi.com/1996-1944/15/6/2177phosphorwhitlockiteDy<sup>3+</sup> |
| spellingShingle | Wanjuan Tang Qingfeng Guo Ke Su Haikun Liu Yuanyuan Zhang Lefu Mei Libing Liao Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure Materials phosphor whitlockite Dy<sup>3+</sup> |
| title | Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure |
| title_full | Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure |
| title_fullStr | Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure |
| title_full_unstemmed | Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure |
| title_short | Structure and Photoluminescence Properties of Dy<sup>3+</sup> Doped Phosphor with Whitlockite Structure |
| title_sort | structure and photoluminescence properties of dy sup 3 sup doped phosphor with whitlockite structure |
| topic | phosphor whitlockite Dy<sup>3+</sup> |
| url | https://www.mdpi.com/1996-1944/15/6/2177 |
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