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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Impact of hydrostatic pressure on the crystal structure and photoluminescence properties of Mn4+-doped BaTiF6 red phosphor
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Impact of hydrostatic pressure on the crystal structure and photoluminescence properties of Mn4+-doped BaTiF6 red phosphor

机译：静水压力对掺Mn4 +的BaTiF6红色荧光粉晶体结构和光致发光性能的影响

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摘要

High-efficiency red phosphors with non-rare-earth activators are emerging as an alternative for next generation solid-state warm white LEDs. Their optical properties depend strongly on the local site symmetry and the crystal field strength. Herein we present the pressure tuning of structural and photoluminescence (PL) properties of Mn4+-doped BaTiF6 up to 40 GPa. In situ high pressure synchrotron X-ray diffraction, Raman and PL spectroscopy studies show that the crystal symmetry changes from trigonal at ambient pressure to monoclinic from 0.5 GPa and triclinic above 14 GPa, attributed to the distortion of (Ti/Mn)F-6 octahedra. The red emission peaks shift monotonically to longer wavelengths due to the reinforced crystal field strength within MnF6 octahedra as pressure increases. A detailed comparison of emission shift rate, PL intensity and FWHM between Mn4+-doped BaTiF6 and ruby (Cr3+-doped Al2O3) was performed using neon pressure transmission medium. This demonstration provides not only an efficient way to artificially tune the emission properties of practically useful phosphors by means of hydrostatic pressure, but also alternative candidates as potential pressure gauges for high pressure techniques.
机译：具有非稀土活化剂的高效红色磷光体正在成为下一代固态暖白光LED的替代产品。它们的光学性质在很大程度上取决于局部位点对称性和晶体场强度。本文中，我们介绍了高达40 GPa的Mn4 +掺杂的BaTiF6的结构和光致发光（PL）性能的压力调节。原位高压同步加速器X射线衍射，拉曼光谱和PL光谱研究表明，由于（Ti / Mn）F-6的畸变，晶体对称性从环境压力下的三角形变为0.5 GPa的三斜晶和14 GPa以上的三斜晶。八面体。由于压力增加，由于MnF6八面体中增强的晶体场强度，红色发射峰单调移动到更长的波长。使用氖气压力传输介质对掺Mn4 +的BaTiF6和红宝石（掺Cr3 +的Al2O3）之间的发射位移速率，PL强度和FWHM进行了详细的比较。该演示不仅提供了一种通过静水压力人工调节实际有用的磷光体的发射特性的有效方法，而且还提供了替代方法作为高压技术的潜在压力表。

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