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Luminescence properties and temperature sensing characteristics of Bi 2 WO 6 : Er 3+ , Tm 3+ , Yb 3+ phosphors
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| 【文章作者】Xiakeer, Arepati;Wang, Linxiang;Maimaiti, Munire;Jiang, Mengliang;Feng, Xin;Zhang, Yan |
| 【文章摘要】 Bi2WO6:x%Er3+, y%Tm3+, 6%Yb3+ (x = 0, 0.5, 1, 2, 4, 6; y = 0, 1) upconversion luminescent materials were prepared via a high-temperature solid-state method. XRD studies showed that Er3+, Tm3+ and Yb3+ doping at various concentrations had little effect on the orthorhombic structure of the Bi2WO6 crystal system. SEM images showed that the morphologies of the Bi2WO6: 1%Tm3+, 6%Yb3+ and Bi2WO6: 4%Er3+, 1%Tm3+, 6%Yb3+ powder samples were uneven, with agglomeration of nearly spherical particles and particle sizes of 0.5-5 mu m. The average granularities of the samples were slightly smaller after Er3+ codoping. With 980 nm excitation (power: 500 mW), Bi2WO6: 4%Er3+, 6%Tm3+, 6%Yb(3+)samples exhibited the strongest luminescence upconversion. With increasing Er3+ doping levels, the intensity of Er3+ luminescence in the Bi2WO6: x%Er3+, 1%Tm3+, 6%Yb3+ samples first increased and then decreased, whereas the Tm3+ luminescence significantly decreased, indicating energy transfer from Tm3+ to Er3+. For Bi2WO6: 4%Er3+, 1%Tm3+, 6%Yb3+ samples excited with 100-500 mW powers and at 980 nm, the 525 nm and 530 nm green emission peaks for Er3+ and 685 nm and 705 nm red emission peaks for Tm3+ resulted from two-photon absorption. For the Bi2WO6: 4%Er3+, 1%Tm3+, 6%Yb3+ sample excited at 980 nm, the temperature was characterized by the I-543nm/I-705nm fluorescence intensity ratio; at 298 K, the maximum S-a was 0.806 K-1, and the maximum S-r was 0.0243 K-1. When the temperature was characterized by the I-705nm/I-525nm fluorescence intensity ratio, S-a was 0.0256 K-1 at 573 K, and the maximum S-r was 0.0382 K-1. At 298 K, the sample showed a minimum temperature resolution of 0.026 K. As the temperature increased from 298 K to 573 K, the luminescence color of the sample gradually shifted from the green to orange-yellow. |
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【卷】【ISSUE】【ISSUEID】
【文章期份】2024
【发布日期】2025/5/13 10:26:32
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