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Unraveling the superior role of dicarboxylic acids as surface chelators in Eu3+-doped yttrium fluorides: A systematic modulation of the crystal phases and morphologies for highly tuned optical performance
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.jallcom.2021.160847
Pablo Serna-Gallén , Héctor Beltrán-Mir , Eloísa Cordoncillo

Eu3+-doped YF3 and KY3F10 phosphors have been prepared hydrothermally in a wide range of pH values without the use of surface chelators and adding oxalic or tartaric acid. We have proved, for the first time, the usefulness of dicarboxylic acids to modulate the evolution of the surface and crystal phases in the KF-YF3 system. The morphologies and crystal structures of the materials displayed a critical dependence on the pH and the chelator employed, and a plausible mechanism to explain the differences among the distinct series of samples is proposed. As a result, the fluorides exhibited outstanding and tunable photoluminescence, with extremely high quantum efficiencies and very long lifetimes. The asymmetry ratio and Judd-Ofelt parameters calculations allowed us to establish a relationship between the optical performance of the compounds and their physicochemical properties. We feel that this study can arouse widespread interest within the materials engineering community, since similar procedures could be implemented to the extended family of complex yttrium/lanthanide fluorides for advanced applications in important fields such as bioanalytics, biomedics, or photonics. Indeed, the materials in the present work, with orangish-yellow colored emissions, could be very interesting for application in white light emitting diodes through their combination with blue chips.



中文翻译:

揭示二羧酸作为 Eu 3+掺杂的氟化钇中表面螯合剂的优越作用:系统调制晶相和形态以实现高度调谐的光学性能

Eu 3+掺杂的YF 3和KY 3 F 10磷光体已经在很宽的pH值范围内水热制备,而不使用表面螯合剂和添加草酸或酒石酸。我们首次证明了二羧酸在调节 KF-YF 3表面和晶相演变方面的有用性系统。材料的形态和晶体结构显示出对 pH 值和所用螯合剂的严重依赖,并提出了一种合理的机制来解释不同系列样品之间的差异。因此,氟化物表现出出色且可调谐的光致发光,具有极高的量子效率和非常长的寿命。不对称比和 Judd-Ofelt 参数计算使我们能够建立化合物的光学性能与其理化性质之间的关系。我们认为这项研究可以引起材料工程界的广泛兴趣,因为可以对复杂的钇/镧系元素氟化物的扩展家族实施类似的程序,以用于重要领域的高级应用,例如生物分析、生物医学、或光子学。事实上,目前工作中的材料具有橙黄色的发射,通过与蓝色芯片的结合,对于在白色发光二极管中的应用可能非常有趣。

更新日期:2021-06-19
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