Abstract
The luminescence of Eu 3+ in sodium europium hydroxyfluoride carbonate, Na 2Eu(CO 3)F 2.5(OH) 0.5, synthesized by hydrothermal growth at low temperature, is presented. The structure is orthorhombic and is built up from EuO 3(F, OH) 6 polyhedra linked by triangular faces and edges. The emission spectrum consists of groups of sharp lines attributed to 5D 0→ 7F 0–4 transitions of one low symmetry site for Eu 3+ in agreement with the crystallographic analysis. 23 from 25 expected electronic levels for 7F J ( J=0–4) manifolds are fitted by the phenomenological crystal field parameters in the approaching C 2v point symmetry. The simulation is achieved with very good root mean square ( rms) deviation of 5.3 cm −1. The crystal field strength parameter, N v, is weak ( N v=1652). Satellite vibronics of carbonate groups coupled to electronic transitions are also observed.
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