Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl

Abstract

Abstract. Luminescence properties of divalent europium in the mixedanion hydride chloride EuHCl were studied for the first time. Olivegreen single crystals of EuHCl (PbFCl-type structure: tetragonal, P4/nmm, a = 406.58(3) pm, c = 693.12(5) pm, c/a = 1.705, Z = 2) resulted from the reaction of elemental europium (Eu), sodium hydride (NaH) and sodium chloride (NaCl), while powder samples were prepared from the binary components europium dihydride (EuH 2 ) and dichloride (EuCl 2 ). Low temperature X-ray powder diffraction proved the absence of phase transitions for 12(2) K Յ T Յ 295(2) K. Bright green emission was observed under UV-excitation and assigned to the

Recent Advances in Rare Earth‐Doped Hydrides

“…In the hydride chloride of divalent europium, EuHCl, crystallizing in the matlockite‐type structure (space group P 4/ nmm ), green broad band luminescence (maximum 510 nm) was observed . The europium cation is located inside a square antiprism formed by four hydride and five chloride anions and capped by one of the five chloride anions .…”

Nephelauxetic effect of the hydride ligand in Sr2LiSiO4H as a host material for rare-earth-activated phosphors

“…For the past decades, hydrides and mixed anion hydrides containing Eu 2+ dopant have been reported to exhibit green-red luminescence. 10,[14][15][16][17][18][19][20] However, their poor stability in air and moisture limits their application. In contrast, we have recently demonstrated that oxyhydride GdHO is stable in ambient air and can act as a phosphor host for Tb 3+ .…”

Electron–Phonon Coupling in Luminescent Europium-Doped Hydride Perovskites Studied by Luminescence Spectroscopy, Inelastic Neutron Scattering, and First-Principles Calculations

“…For such broad 5d–4f emission spectra, it is, even at low temperatures, rare that a well-resolved vibrational fine structure showing coupling to several modes can be observed because the coupling strength is usually intermediate; that is, the Huang–Rhys parameter S has the value 1 < S < 5 . However, some rare examples exist for Ce 3+ , Pr 3+ , and Tb 3+ with well-resolved spectra that show a coupling to two vibrations in double perovskites. − Recently, new types of host materials, ionic hydrides, − complex hydrides, , and mixed anionic compounds containing hydrides, − have been studied as hosts for Eu 2+ luminescence. Here, it was found that replacing less polarizable anions by the polarizable hydride anion can lead to wide shifts of the barycenter of the 5d levels to lower energies.…”