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首页> 外文期刊>Journal of Materials Research >Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate
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Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

机译：离子尺寸对掺and和do的原硅酸镁热致发光的影响

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摘要

Thermoluminescence (TL) and radioluminescence (RL) are reported over the temperature range 25-673 K from MgSiO_4:Tb and MgSiO_4:Eu. The dominant signals arise from the transitions within the Rare Earth (RE) dopants, with limited intensity from intrinsic or host defect sites. The Tb and Eu ions distort the lattice and alter the stability of the TL sites and the peak TL temperature scales with the Tb and Eu ion size. The larger Eu ions stabilize the trapped charges more than for the Tb, and so the Eu TL peak temperatures are ～20% higher. There are further size effects linked to the TL driven by the volume of the upper state orbitals of the rare earth transitions. For Eu the temperatures of the TL peaks are wavelength dependent since higher excited states couple to distant traps via more extensive orbits. The same pattern of peak temperature data is encoded in RL during heating. The data imply that there are sites in which the rare earth and charge stabilizing defects are closely associated within the host lattice, and the stability of the entire complex is linked to the lattice distortions from inclusions of impurities.
机译：据报道，在25-673 K的温度范围内，MgSiO_4：Tb和MgSiO_4：Eu的热致发光（TL）和放射致发光（RL）。主导信号来自稀土（RE）掺杂物内部的跃迁，其固有或宿主缺陷部位的强度有限。 Tb和Eu离子扭曲了晶格，并随着Tb和Eu离子的大小改变了TL位点的稳定性和TL峰值温度标度。较大的Eu离子比Tb稳定了更多的电荷，因此Eu TL的峰值温度高出约20％。还有其他与TL相关的尺寸效应，这是由稀土跃迁的上态轨道的体积驱动的。对于Eu，TL峰的温度与波长有关，因为更高的激发态通过更宽的轨道耦合到远处的陷阱。加热期间，RL中会编码相同模式的峰值温度数据。数据表明，在某些位置上，主晶格内稀土和电荷稳定缺陷紧密相关，整个配合物的稳定性与杂质夹杂物引起的晶格畸变有关。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3443-3452|共10页
  • 作者

    Ying Zhao; Yang Zhou; Yun Jiang; Weigong Zhou; Adrian A. Finch; Peter D. Townsend; Yafang Wang;

  • 作者单位

    School of Science, China University of Geosciences, Beijing 100083, China;

    School of Science, China University of Geosciences, Beijing 100083, China;

    School of Science, China University of Geosciences, Beijing 100083, China;

    School of Great Wall, China University of Geosciences, Beijing 100083, China;

    Department of Earth & Environmental Sciences, University of St Andrews, Fife KY16 9AL, United Kingdom;

    Physics Building, University of Sussex, Brighton BN1 9QH, United Kingdom;

    School of Science, China University of Geosciences, Beijing 100083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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