We report on a particularly stable 3 V all-solid-state sodium–ion battery built using a closo-borate based electrolyte, namely Na2(B12H12)0.5(B10H10)0.5.

Hoch besetzt: Eine hoch poröse Form von Mg(BH4)2 (siehe Bild; Mg grün, BH4 blau, Elementarzellen rot) adsorbiert H2, N2 und CH2Cl2 reversibel. Bei hohen Drücken wandelt sich das Material in ein verschachteltes Gerüst um, das eine um 79 % höhere Dichte als die anderen Polymorphe aufweist. Mg(BH4)2 kann als ein Koordinationspolymer wirken, das starke Ähnlichkeiten mit Metall‐organischen Gerüsten aufweist.

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The extraordinary long phosphorescence of SrAl2O4:Eu 2+ :Dy 3+ has been widely studied in powder samples due to its broad range of applications in this form and despite the fact that the bulk material shows higher intensity emission and longer afterglow. However, the investigation of SrAl2O4:Eu 2+ :Dy 3+ crystals that, unlike the powder do not contain surface defects, would allow a better insight into the mechanism that governs the long-lasting phosphorescence of this co-doped material. Thus, a SrAl2O4:Eu 2+ :Dy 3+ single crystal was studied in detail by absorption spectroscopy and photoluminescence, including a novel estimation of its extinction coefficient. In addition, thermoluminescence measurements and wavelength dependent quantum efficiencies measurements have been performed to improve the understanding of the role of both europium and dysprosium ions in the corresponding persistent phosphorescence mechanism.