A series of BaLi₂Al₂Si₂N₆ (BLASN): xEu²⁺ phosphors are successfully synthesized and their crystal structure and luminescence properties under varying hydrostatic pressures are reported herein. Structure variation is analyzed using in situ high‐pressure X‐ray diffraction and Rietveld refinements. Based on decay curves and Gaussian fitting of emission spectra, the presence of two photoluminescence centers is demonstrated. BaLi₂Al₂Si₂N₆: 0.01Eu²⁺ exhibits an evident peak position shift from 532 to 567 nm with an increase in pressure to ≈20 GPa. The possible factors and mechanisms for the variations are studied in detail. At a pressure of 16 GPa, BLASN: Eu²⁺ realizes a narrow yellow emission with a full width at half maximum of ≈70 nm. The addition of BLASN: Eu²⁺ (16 GPa) to the commercial white light‐emitting diodes combination consisting of an InGaN chip, β‐SiAlON: Eu²⁺, and red K₂SiF₆:Mn⁴⁺, can increase the color gamut by ≈15%, demonstrating the promising potential of pressure‐driven BLASN: Eu²⁺ for wide‐color gamut spectroscopy applications. Moreover, the emission shifts arising from pressure variation and the distinct color changes enable its potential utility as an optical pressure sensor; the material exhibits high pressure sensitivity (dλ/dP ≈ 1.58 nm GPa⁻¹) with the advantage of visualization.

中文翻译：

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压力驱动的Eu2 +掺杂BaLi2Al2Si2N6：一种适用于光谱学和压力传感器应用的新型彩色可调窄带发射磷光体

成功合成了一系列BaLi ₂ Al ₂ Si ₂ N ₆（BLASN）：x Eu ²⁺荧光粉，并报道了其在不同静水压力下的晶体结构和发光性能。使用原位高压X射线衍射和Rietveld精炼分析结构变化。基于衰变曲线和发射光谱的高斯拟合，证明了两个光致发光中心的存在。BaLi ₂ Al ₂ Si ₂ N ₆：0.01Eu ²⁺当压力增加到≈20GPa时，峰位置从532 nm移至567 nm。对变化的可能因素和机理进行了详细研究。BLASN：Eu ²⁺在16 GPa的压力下实现了窄的黄色发射，其全宽为≈70nm的一半最大值。在由InGaN芯片，β-SiAlON：Eu ²⁺和红色K ₂ SiF ₆：Mn ⁴⁺组成的商用白色发光二极管组合中添加BLASN：Eu ²⁺（16 GPa）可以增加颜色色域≈15％，表明压力驱动的BLASN：Eu ²⁺具有广阔的发展潜力适用于广色域光谱应用。而且，由于压力变化和明显的颜色变化而引起的发射位移使它有可能用作光学压力传感器。该材料表现出高的压力敏感性（Dλ/ d P ≈1.58纳米GPA ^-1）与可视化的优点。