High-pressure luminescence studies of alkali–halide phosphors doped with Pb++ and Sn++

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Abstract
The effect of pressure to 140 kbar has been measured on the luminescent properties of a series of alkali halides doped with Pb++ and Sn++ in both the fcc and simple cubic (sc) phases. In a few cases absorption or excitation data are also presented. For selected cases the results are analyzed in terms of a single‐configuration coordinate diagram and the possibilities and limitations are discussed. For three sodium halides and three potassium halides (the latter in the sc phase) a comparison of peak‐shift data are made for Pb++, Sn++, and previously published data on Tl+ and In+. The analysis is based on the effect of ionic radii and anion polarizability on the ratio of the force constants for the excited and ground states. Some aspects of the spectra, including intensity changes, are discussed in terms of Jahn‐Teller splitting.