Eu(HCOO)$_3$ 与 Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ 晶体的合成及其用于量子信息系统的 $^5$D$_{0}\rightarrow ^{7}$F$_0$ 跃迁观测
Synthesis of Eu(HCOO)$_3$ and Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ crystals and observation of their $^5$D$_{0}\rightarrow ^{7}$F$_0$ transition for quantum information systems
AI总结：
本文合成两种含 Eu$^{3+}$ 的金属有机框架单晶，通过室温和 1.4 K 光致发光表征其 $^5$D$_{0}\rightarrow {^7}$F$_J$ 跃迁，并首次报道 $^5$D$_{0}\rightarrow {^7}$F$_0$ 跃迁及其量子存储潜力。
摘要：
研究考察了两种含 Eu$^{3+}$ 阳离子的化学计量金属有机框架，将其作为基于光子的量子信息存储候选材料。文中给出了生长 0.2 mm 棒状 Eu(HCOO)$_3$ 和 1–3 mm 菱面体 Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ 单晶的合成步骤；Eu(HCOO)$_3$ 在加热后最快 1 h 即可见沉淀，而 Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ 需 24 h。研究分析了两种化合物在室温和 1.4 K 下 Eu$^{3+}$ 的 $^5$D$_{0}\rightarrow {^7}$F$_J$ 跃迁光致发光测量结果，讨论了峰宽和强度比较，并首次显著报道了两者的 $^5$D$_{0}\rightarrow {^7}$F$_0$ 跃迁，其超精细结构在量子存储器应用中具有潜在用途。文中还讨论了 Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ 在空气中的不稳定性及其光致发光性质的转变。
英文摘要：
Two stoichiometric metal-organic frameworks containing Eu$^{3+}$ cations are probed as candidates for photon-based quantum information storage. Synthesis procedures for growing 0.2 mm, rod-shaped Eu(HCOO)$_3$ and 1-3 mm, rhombohedral Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ single crystals are presented with visible precipitation as soon as 1 h into heating for Eu(HCOO)$_3$ and 24 h for Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$. Room temperature and 1.4 K photoluminescence measurements of the $^5$D$_{0}\rightarrow {^7}$F$_J$ transitions of Eu$^{3+}$ are analyzed for both compounds. Comparisons of peak width and intensity are discussed along with the notable first report for both of the $^5$D$_{0}\rightarrow {^7}$F$_0$ transition, the hyperfine structure of which has potential use in quantum memory applications. The air instability of Eu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ and the transformation of its photoluminescence properties are discussed.
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