In this study Eu³⁺-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-KY₃F₁₀, δ–KY₃F₁₀·xH₂O, and Y(OH)_3–xF_x. To date, the literature has primarily focused only on the α-phase of KY₃F₁₀. Yet, explaining the formation of the mostly uncharted δ-phase of KY₃F₁₀ remains a challenge. Thus, this paper offers the key to synthesizing both the α and the δ-phases of KY₃F₁₀ 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 Eu³⁺ 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，Eu ³⁺掺杂的氟化钇是通过超声辅助工艺在不同的 pH 值（4.0-9.0）下设计的。这种新颖的策略能够获得具有有趣形态和调制晶体结构的材料：α-KY ₃ F ₁₀、δ-KY ₃ F ₁₀ · x H ₂ O 和 Y(OH) _{3- x} F _x。迄今为止，文献主要只关注 KY ₃ F ₁₀的α相。_{然而，解释了大部分未知的 KY 3} F ₁₀ δ 相的形成仍然是一个挑战。因此，本文提供了合成 KY ₃ F ₁₀的 α 和 δ 相的关键，并报告了第一个超声辅助制备羟基氟化钇的方法。它还揭示了不同的 pH 依赖性反应与化合物形成机制之间的联系。除此之外，Eu ^{3+的独特之处}离子允许对不同材料进行彻底研究，并赋予化合物光致发光特性。结果强调了高度可调的光学响应，具有广泛的颜色发射（从橙色到红色色调）、寿命（从 7.9 毫秒到 1.1 毫秒）和量子效率（98-28%）。该研究揭示了声化学在获得具有可控晶体结构的发光氟化物方面的重要性，这可以为无机材料的合成和设计开辟新途径。