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721 results on '"Wu, Mingmei"'

15. Unlocking color-tunable emission of Eu2+-activated phosphors through doping-free exploration of hidden sites.

Author

Hu, Dongkai, Rahman, Mavlanjan, Liu, Shuifu, Shen, Lina, Dai, Pengpeng, Wen, Dawei, and Wu, Mingmei

Abstract

While numerous approaches have been devised to optimize the luminescence properties of Eu2+-activated phosphors, the quest for a simple design strategy to achieve color-tunable Eu2+ emission remains a significant challenge. Here, we present a straightforward, doping-free method to tailor the site occupation of Eu2+ and modify its luminescence properties. In the pristine sample, the NaBaB9O15 (NBB) host featuring two cation sites (Na+ and Ba2+), Eu2+ exclusively occupies the Ba2+ site, resulting in blue emission when the NBB:Eu2+ phosphor is synthesized in a H2 reducing atmosphere. When we use CO instead of a H2 reducing atmosphere, impressively, the formation energy required for heterovalent substitution of Na+ by Eu2+ is lowered, leading to the emergence of a distinct green emission band. Significantly, the resultant phosphor NBB:Eu2+@CO exhibits not only a high internal quantum yield of 85.1% and zero-thermal-quenching behavior within the temperature range of 25–200 °C but also wavelength-tunable emission. Benefitting from the multi-color luminescence of the NBB:Eu2+@CO phosphor, its optical applications will no longer be confined to general lighting but extend to anti-counterfeiting and encryption. This study provides a novel design methodology for optimizing the optical properties of Eu2+-activated phosphors. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Quantifying rigidity for thermally stable Cr3+ phosphors.

Author

Xu, Shaojian, Feng, Jiahao, Zhang, Daidi, Zhang, Biqian, Wen, Dawei, Wu, Mingmei, and Li, Junhao

Abstract

Near-infrared (NIR) phosphors with high thermal stability are significant for NIR light-emitting diodes (LEDs). For a decade, Debye temperature has been a successful indicator of structural rigidity and thermal stability for phosphors, but some exceptions exist due to its dependence on atomic mass. Inspired by the Debye temperature model that relates the elastic properties of solids, our density functional theory calculations revealed that the Vickers hardness of Cr3+-doped NIR phosphors was negatively correlated with Stokes shifts (Pearson's R = −0.81) and positively correlated with thermal stabilities (Pearson's R = 0.85) within a set of 13 distinct material types. Highlighting the predictive power of Vickers hardness, two new NIR phosphors were investigated: KMg(PO3)3:Cr3+ showed low thermal stability, correlating with its lower Vickers hardness, in contrast to the high thermal stability and correspondingly higher Vickers hardness of La2MgSnO6:Cr3+. Vickers hardness can be used to screen potential hosts for Cr3+-doped NIR phosphors with high thermal stabilities, due to the advantages of the predictable feature by density functional theory calculation and low independence on atomic mass. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Data from MIF Produced by Bone Marrow–Derived Macrophages Contributes to Teratoma Progression after Embryonic Stem Cell Transplantation

Author

Wang, Xi, primary, Chen, Tianxiang, primary, Leng, Lin, primary, Fan, Jianqing, primary, Cao, Kai, primary, Duan, Zhaoxia, primary, Zhang, Xijing, primary, Shao, Changshun, primary, Wu, Mingmei, primary, Tadmori, Iman, primary, Li, Tianyi, primary, Liang, Li, primary, Sun, Dongming, primary, Zheng, Shusen, primary, Meinhardt, Andreas, primary, Young, Wise, primary, Bucala, Richard, primary, and Ren, Yi, primary

Published
2023
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40. Supplementary Methods from MIF Produced by Bone Marrow–Derived Macrophages Contributes to Teratoma Progression after Embryonic Stem Cell Transplantation

Author

Wang, Xi, primary, Chen, Tianxiang, primary, Leng, Lin, primary, Fan, Jianqing, primary, Cao, Kai, primary, Duan, Zhaoxia, primary, Zhang, Xijing, primary, Shao, Changshun, primary, Wu, Mingmei, primary, Tadmori, Iman, primary, Li, Tianyi, primary, Liang, Li, primary, Sun, Dongming, primary, Zheng, Shusen, primary, Meinhardt, Andreas, primary, Young, Wise, primary, Bucala, Richard, primary, and Ren, Yi, primary

Published
2023
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41. Supplementary Figure 3 from MIF Produced by Bone Marrow–Derived Macrophages Contributes to Teratoma Progression after Embryonic Stem Cell Transplantation

Author

Wang, Xi, primary, Chen, Tianxiang, primary, Leng, Lin, primary, Fan, Jianqing, primary, Cao, Kai, primary, Duan, Zhaoxia, primary, Zhang, Xijing, primary, Shao, Changshun, primary, Wu, Mingmei, primary, Tadmori, Iman, primary, Li, Tianyi, primary, Liang, Li, primary, Sun, Dongming, primary, Zheng, Shusen, primary, Meinhardt, Andreas, primary, Young, Wise, primary, Bucala, Richard, primary, and Ren, Yi, primary

Published
2023
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42. Supplementary Figure 1 from MIF Produced by Bone Marrow–Derived Macrophages Contributes to Teratoma Progression after Embryonic Stem Cell Transplantation

Author

Wang, Xi, primary, Chen, Tianxiang, primary, Leng, Lin, primary, Fan, Jianqing, primary, Cao, Kai, primary, Duan, Zhaoxia, primary, Zhang, Xijing, primary, Shao, Changshun, primary, Wu, Mingmei, primary, Tadmori, Iman, primary, Li, Tianyi, primary, Liang, Li, primary, Sun, Dongming, primary, Zheng, Shusen, primary, Meinhardt, Andreas, primary, Young, Wise, primary, Bucala, Richard, primary, and Ren, Yi, primary

Published
2023
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43. Supplementary Figure 2 from MIF Produced by Bone Marrow–Derived Macrophages Contributes to Teratoma Progression after Embryonic Stem Cell Transplantation

Author

Wang, Xi, primary, Chen, Tianxiang, primary, Leng, Lin, primary, Fan, Jianqing, primary, Cao, Kai, primary, Duan, Zhaoxia, primary, Zhang, Xijing, primary, Shao, Changshun, primary, Wu, Mingmei, primary, Tadmori, Iman, primary, Li, Tianyi, primary, Liang, Li, primary, Sun, Dongming, primary, Zheng, Shusen, primary, Meinhardt, Andreas, primary, Young, Wise, primary, Bucala, Richard, primary, and Ren, Yi, primary

Published
2023
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44. Interface Density Engineering on Heterogeneous Molybdenum Dichalcogenides Enabling Highly Efficient Hydrogen Evolution Catalysis and Sodium Ion Storage

Author

Huang, Senchuan, primary, Cao, Yangfei, additional, Yao, Fen, additional, Zhang, Daliang, additional, Yang, Jing, additional, Ye, Siyang, additional, Yao, Deqiang, additional, Liu, Yan, additional, Li, Jiade, additional, Lei, Danni, additional, Wang, Xuxu, additional, Huang, Haitao, additional, and Wu, Mingmei, additional

Published
2023
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46. The Upconversion Luminescence of Ca3Sc2Si3O12:Yb3+,Er3+ and Its Application in Thermometry

Author

Hong, Junyu, Liu, Feilong, Dramićanin, Miroslav, Zhou, Lei, Wu, Mingmei, Hong, Junyu, Liu, Feilong, Dramićanin, Miroslav, Zhou, Lei, and Wu, Mingmei

Abstract

To develop novel luminescent materials for optical temperature measurement, a series of Yb3+- and Er3+-doped Ca3Sc2Si3O12 (CSS) upconversion (UC) phosphors were synthesized by the sol– gel combustion method. The crystal structure, phase purity, and element distribution of the samples were characterized by powder X-ray diffraction and a transmission electron microscope (TEM). The detailed study of the photoluminescence emission spectra of the samples shows that the addition of Yb3+ can greatly enhance the emission of Er3+ by effective energy transfer. The prepared Yb3+ and Er3+ co-doped CSS phosphors exhibit green emission bands near 522 and 555 nm and red emission bands near 658 nm, which correspond to the 2H11/2→4 I15/2, 4S3/2→4 I15/2, and 4F9/2→4 I15/2 transitions of Er3+, respectively. The temperature-dependent behavior of the CSS:0.2Yb3+,0.02Er3+ sample was carefully studied by the fluorescence intensity ratio (FIR) technique. The results indicate the excellent sensitivity of the sample, with a maximum absolute sensitivity of 0.67% K−1 at 500 K and a relative sensitivity of 1.34% K−1 at 300 K. We demonstrate here that the temperature measurement performance of FIR technology using the CSS:Yb3+,Er3+ phosphor is not inferior to that of infrared thermal imaging thermometers. Therefore, CSS:Yb3+,Er3+ phosphors have great potential applications in the field of optical thermometry.

Published
2023

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