期刊
INORGANIC CHEMISTRY
卷 47, 期 22, 页码 10288-10298出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic800606h
关键词
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资金
- Spanish Ministerio de Educacion y Ciencia [MAT2005-00099]
- Research Intensification program (13) of the University of Cantabria
- MALTA Consolider Ingenio [CSD2007-00045]
This work investigates the photoluminescence (PL) properties of the Cr3+-doped and Cr3+-pure fluoroelpasolites along the A(2)BMF(6) series and as a function of pressure. In particular, we focus on the variation of the crystal-field spectrum and the associated PL. The results are explained on the basis of the octahedral (CrF6)(3-) complex subjected either to external pressure or the internal pressure exerted by different crystal hosts. We have established structural correlations between the crystal-field parameter 10Dq and the Cr-F distance, RCr-F, from which we have determined the local structure around the Cr3+ impurity, allowing the host material effect on the Cr-F bonds to be studied. As salient features, we show, first, a weak dependence of the first excitation energy, El, usually identified as 10Dq, with RCr-F as E-1 = KRCr-F-3.3 and, second, an increase of the Stokes shift upon RCr-F reduction or with increasing pressure. We associate this unusual behavior with the existence of state mixing among T-4(2g)(F), E-2(g)(G), and T-2(1g)(G) states in the first excitation band of Cr3+. Finally, high-pressure experiments performed on Rb2KCrF6 indicate that the excited-state spin crossover, E-2(g)(G) <-> T-4(2g)(F), takes place around 7 GPa. The results indicate the suitability of the selected A(2)BMF(6):Cr3+ elpasolites to establish structural correlations between PL and RCr-F.
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