Analysis of a qualitative criterion for forecasting off-centre displacement of impurity ions in ionic crystals

Bosi, L.; Nimis, M.

doi:10.1007/bf02456964

Cited by 31 publications

(1 citation statement)

References 17 publications

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“…27 The crystal radius of Ag + (1.0 Å) is almost identical to Na + (0.99 Å). 28 The partial charge forecast model developed by Bosi and Nimis, 29,30 and electronic structure calculations of Pedrini et al, 31 indicate that in the ground electronic state, the Ag + ion substitutes on center for a Na + ion. The absorption spectrum of NaCl:Ag + consists of a series of broad bands labelled A to F, ranging from 220 to 180 nm.…”

Section: Discussionmentioning

confidence: 99%

Deep ultraviolet and visible crystalloluminescence of sodium chloride

Alexander

2012

The Journal of Chemical Physics

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A protocol has been developed for production of intense crystalloluminescence (XTL) from sodium chloride in aqueous solution by selective doping with transition metal salts (Ag(+), Cu(2+), and Dy(3+)). The method was used to record complete, fully dispersed deep UV-visible (200-650 nm) XTL spectra of sodium chloride for the first time. The results show conclusively that the emissions are due to dopant cations in the NaCl lattice, with no evidence for emission directly from NaCl, e.g., by triboluminescence resulting from crystalline fracture. The UV components of the XTL spectrum are attributed to single cation substituents (Ag(+) and Cu(+)), and a strong visible component (~415 nm) of the XTL is attributed to emission from silver-pair centers, (Ag(+))(2). The nature of the electronic transitions of the dopant cations is discussed. The results suggest that the timescale for transformation of a cluster to the crystalline phase is rapid, with efficient relaxation to the lowest excited electronic states of the dopant cation. This transformation is followed by photoemission of the cation in the nascent crystal.

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Section: Discussionmentioning

confidence: 99%

Deep ultraviolet and visible crystalloluminescence of sodium chloride

Alexander

2012

The Journal of Chemical Physics

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Review of Emission and Lifetime Data Concerning Cu+ Fluorescence in Alkali Halides

Bosi

Gallo

et al. 2001

phys. stat. sol. (b)

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A review of the relevant data concerning the decay properties of the Cu þ fluorescence in alkali halides is presented. A critical analysis of the experiments reported in literature shows that the problem of the correct and complete interpretation of the Cu þ fluorescence was made complicated in the past essentially because of historical reasons. The validity of the decay models was ascertained by the authors by simultaneously detecting both lifetime and quantum yield during each set of measurements as a function of the temperature.

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