| Autor: |
Che, Junzhi, Deng, Bin, Song, Qinyang, Wang, Jianxu, Wang, Tao, Zhao, Shoucheng, Yu, Ruijin |
| Zdroj: |
Journal of Rare Earths; June 2021, Vol. 39 Issue: 6 p634-642, 9p |
| Abstrakt: |
Novel yellow-emitting phosphors of Dy3+-doped double perovskite Ca2MgTeO6were synthesized by using a conventional high-temperature solid-state reaction. The phase purity, particle morphology, size distribution, elemental composition, luminescence properties, and luminescence decay curves of the resulting products were then analyzed in detail. The Ca2MgTeO6:Dy3+,Na+phosphors show three emission peaks after near-ultraviolet excitation at 350 nm, which correspond to 4F9/2 → 6H11/2, 4F9/2→ 6H13/2, and 4F9/2 → 6H13/2transitions, respectively. Among them, the strongest peak is observed at 573 nm. The best doping content of Dy3+in Ca2MgTeO6:xDy3+,xNa+phosphors is x = 5 mol%. The calculated critical distance of energy transfer between Dy3+ions is 1.6 nm. Luminescence quenching is confirmed to be due to dipole-dipole interactions among Dy3+ions. The phosphors show excellent thermal stability with high activation energy (0.27 eV). The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of the Ca2MgTeO6Dy3+,Na+phosphors are located in the yellow region. White light-emitting diodes (w-LEDs) were fabricated with a high color rendering index (Ra) of 88 and a good correlated color temperature (CCT) of 5440 K. All observed properties indicate that Ca2MgTeO6:Dy3+,Na+phosphors have potential applications in display and photonic devices. |
| Databáze: |
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