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Two stoichiometric metal-organic frameworks containing Eu$^{3+}$ cations areprobed as candidates for photon-based quantum information storage. Synthesisprocedures for growing 0.2 mm, rod-shaped Eu(HCOO)$_3$ and 1-3 mm, rhombohedralEu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ single crystals are presented with visibleprecipitation as soon as 1 h into heating for Eu(HCOO)$_3$ and 24 h forEu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$. Room temperature and 1.4 Kphotoluminescence measurements of the $^5$D$_{0}\rightarrow {^7}$F$_J$transitions of Eu$^{3+}$ are analyzed for both compounds. Comparisons of peakwidth and intensity are discussed along with the notable first report for bothof the $^5$D$_{0}\rightarrow {^7}$F$_0$ transition, the hyperfine structure ofwhich has potential use in quantum memory applications. The air instability ofEu(HCOO)$_{3}\cdot$(HCONH$_2$)$_2$ and the transformation of itsphotoluminescence properties are discussed.

journal of luminescence

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