Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Av. Sos Baynat s/n 12071, Castelló de la Plana, Spain.
Ultrason Sonochem. 2022 Jun;87:106059. doi: 10.1016/j.ultsonch.2022.106059. Epub 2022 Jun 6.
In this study Eu-doped yttrium fluorides were designed by ultrasound-assisted processes at different pH values (4.0-9.0). This novel strategy has enabled to obtain materials with intriguing morphologies and modulated crystal structures: α-KYF, δ-KYF·xHO, and Y(OH)F. To date, the literature has primarily focused only on the α-phase of KYF. Yet, explaining the formation of the mostly uncharted δ-phase of KYF remains a challenge. Thus, this paper offers the key to synthesizing both the α and the δ-phases of KYF and also reports the first ultrasound-assisted process for the preparation of yttrium hydroxyfluorides. It is also unraveled the connection between the different pH-dependent reactions and the formation mechanisms of the compounds. In addition to this, the unique features of the Eu ion have allowed to conduct a thorough study of the different materials and have endowed the compounds with photoluminescent properties. The results underscore a highly tunable optical response, with a wide gamut of color emissions (from orangish to red hues), lifetimes (from 7.9 ms to 1.1 ms) and quantum efficiencies (98-28%). The study unveils the importance of sonochemistry in obtaining luminescent fluorides with controlled crystal structures that can open up new avenues in the synthesis and design of inorganic materials.
在这项研究中，通过在不同 pH 值（4.0-9.0）下的超声辅助过程设计了 Eu 掺杂的钇氟化物。这种新颖的策略使我们能够获得具有有趣形态和调制晶体结构的材料：α-KYF、δ-KYF·xHO 和 Y(OH)F。迄今为止，文献主要集中在 KYF 的α相上。然而，解释 KYF 的主要未知δ相的形成仍然是一个挑战。因此，本文提供了合成 KYF 的α和δ相的关键，并首次报道了超声辅助制备钇羟基氟化物的方法。还揭示了不同 pH 依赖性反应与化合物形成机制之间的联系。除此之外，Eu 离子的独特特性使得可以对不同的材料进行深入研究，并赋予化合物发光性能。研究结果强调了具有可调谐光学响应的高度可调谐光学响应，具有广泛的颜色发射（从橙色到红色）、寿命（从 7.9ms 到 1.1ms）和量子效率（98-28%）。该研究揭示了声化学在获得具有受控晶体结构的发光氟化物方面的重要性，这为无机材料的合成和设计开辟了新途径。
