Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications
A precursor was prepared using a co-precipitation method to synthesize crystalline calcium tungstate. The prepared precursor was dried in an oven at 80 °C for 18 h. The dried powders, prepared without a heat treatment process, were observed in XRD analysis to be a crystalline CaWO<sub>4</su...
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| Format: | Article |
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MDPI AG
2021-10-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/10/1214 |
| _version_ | 1827679825679089664 |
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| author | Soung-Soo Yi Jae-Yong Jung |
| author_facet | Soung-Soo Yi Jae-Yong Jung |
| author_sort | Soung-Soo Yi |
| collection | DOAJ |
| description | A precursor was prepared using a co-precipitation method to synthesize crystalline calcium tungstate. The prepared precursor was dried in an oven at 80 °C for 18 h. The dried powders, prepared without a heat treatment process, were observed in XRD analysis to be a crystalline CaWO<sub>4</sub> phase, confirming that the synthesis of crystalline CaWO<sub>4</sub> is possible even at low temperature. To use this crystalline CaWO<sub>4</sub> as a light emitting material, rare earth ions were added when preparing the precursor. The CaWO<sub>4</sub> powders doped with terbium (Tb<sup>3+</sup>) and europium (Eu<sup>3+</sup>) ions, respectively, were also observed to be crystalline in XRD analysis. The luminescence of the undoped CaWO<sub>4</sub> sample exhibited a wide range of 300~600 nm and blue emission with a central peak of 420 nm. The Tb<sup>3+</sup>-doped sample showed green light emission at 488, 545, 585, and 620 nm, and the Eu<sup>3+</sup>-doped sample showed red light emission at 592, 614, 651, and 699 nm. Blue, green, and red CaWO<sub>4</sub> powders with various luminescence properties were mixed with glass powder and heat-treated at 600 °C to fabricate a blue luminescent PiG disk. In addition, a flexible green and red light-emitting composite was prepared by mixing it with a silicone-based polymer. An anti-counterfeiting application was prepared by using the phosphor in an ink, which could not be identified with the naked eye but can be identified under UV light. |
| first_indexed | 2024-03-10T06:38:37Z |
| format | Article |
| id | doaj.art-75e13c124eff47aba1d229f69bbfe6f3 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T06:38:37Z |
| publishDate | 2021-10-01 |
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| record_format | Article |
| series | Crystals |
| spelling | doaj.art-75e13c124eff47aba1d229f69bbfe6f32023-11-22T17:53:24ZengMDPI AGCrystals2073-43522021-10-011110121410.3390/cryst11101214Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting ApplicationsSoung-Soo Yi0Jae-Yong Jung1Division of Materials Science and Engineering, Silla University, Busan 46958, KoreaDivision of Materials Science and Engineering, Silla University, Busan 46958, KoreaA precursor was prepared using a co-precipitation method to synthesize crystalline calcium tungstate. The prepared precursor was dried in an oven at 80 °C for 18 h. The dried powders, prepared without a heat treatment process, were observed in XRD analysis to be a crystalline CaWO<sub>4</sub> phase, confirming that the synthesis of crystalline CaWO<sub>4</sub> is possible even at low temperature. To use this crystalline CaWO<sub>4</sub> as a light emitting material, rare earth ions were added when preparing the precursor. The CaWO<sub>4</sub> powders doped with terbium (Tb<sup>3+</sup>) and europium (Eu<sup>3+</sup>) ions, respectively, were also observed to be crystalline in XRD analysis. The luminescence of the undoped CaWO<sub>4</sub> sample exhibited a wide range of 300~600 nm and blue emission with a central peak of 420 nm. The Tb<sup>3+</sup>-doped sample showed green light emission at 488, 545, 585, and 620 nm, and the Eu<sup>3+</sup>-doped sample showed red light emission at 592, 614, 651, and 699 nm. Blue, green, and red CaWO<sub>4</sub> powders with various luminescence properties were mixed with glass powder and heat-treated at 600 °C to fabricate a blue luminescent PiG disk. In addition, a flexible green and red light-emitting composite was prepared by mixing it with a silicone-based polymer. An anti-counterfeiting application was prepared by using the phosphor in an ink, which could not be identified with the naked eye but can be identified under UV light.https://www.mdpi.com/2073-4352/11/10/1214photoluminescenceco-precipitationanti-counterfeitingCaWO<sub>4</sub> |
| spellingShingle | Soung-Soo Yi Jae-Yong Jung Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications Crystals photoluminescence co-precipitation anti-counterfeiting CaWO<sub>4</sub> |
| title | Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications |
| title_full | Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications |
| title_fullStr | Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications |
| title_full_unstemmed | Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications |
| title_short | Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications |
| title_sort | calcium tungstate doped with rare earth ions synthesized at low temperatures for photoactive composite and anti counterfeiting applications |
| topic | photoluminescence co-precipitation anti-counterfeiting CaWO<sub>4</sub> |
| url | https://www.mdpi.com/2073-4352/11/10/1214 |
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