Herein we describe the synthesis, crystal structures, photoluminescence (PL) and cathodoluminescence (CL) spectra of phosphors in the Sr_0.97-xBa_xEu_0.03Al₂O₄ system between x = 0 and x = 0.97. The syntheses of these phosphors were carried out by solid state reactions at 1350°C in mixed gas (H₂/N₂). The molar fractions of the alkaline earth elements were varied in steps of 0.1. The Sr_1-xBa_xAl₂O₄ series manifested solid solutions of a monoclinic phase (at the Sr-rich side) and a hexagonal phase (at the Ba-rich side). At the Ba-rich side of Sr_x-1Ba_xAl₂O₄:Eu²⁺ we found evidence in the PL spectra that the hexagonal phase differed as the x_Ba fraction changed: it changed at room temperature from the ferroelectric P6₃ structure at x_Ba=1 to the paraelectric P6₃22 phase at x_Ba≈0.9 and at x_Ba≈0.8 it went back to P6₃. Unlike the PL spectra, the CL spectra of the hexagonal phase of Sr_0.97-xBa_xEu_0.03Al₂O₄ at x ≥ 0.5 indicated only the paraelectric P6₃22 phase at room temperature.

中文翻译：

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Eu ²⁺掺杂的Ba _1-x Sr _x Al ₂ O _4的晶体结构，光致发光和阴极发光

在此，我们描述了在x = 0和x = 0.97之间的Sr _0.97-x Ba _x Eu _0.03 Al ₂ O ₄系统中磷光体的合成，晶体结构，光致发光（PL）和阴极发光（CL）光谱。这些磷光体的合成是在混合气体（H ₂ / N ₂）中于1350°C下通过固态反应进行的。碱土元素的摩尔分数以0.1为步长变化。Sr _1-x Ba _x Al ₂ O ₄系列表现出单斜晶相（富Sr侧）和六方相（富Ba侧）的固溶体。在Sr _x-1的富含Ba的一面Ba _x Al ₂ O ₄：Eu ²⁺我们在PL光谱中发现六方相随x _Ba分数的变化而变化：它在室温下从_xBa = 1的铁电P6 ₃结构变为顺电P6 ₃在×22相_的Ba ≈0.9和x处_的Ba ≈0.8它回到P6 ₃。与PL光谱不同，在x≥0.5时Sr _0.97-x Ba _x Eu _0.03 Al ₂ O ₄的六方相的CL光谱仅表示顺电P6 ₃在室温下为22相。