Abstract
AT temperatures below those at which thermal quenching of luminescence occurs in zinc sulphide phosphors (as shown by the higher temperature forms of the curves of Fig. 1), there is often a slow temperature variation of the luminescence efficiency. The sign of the temperature coefficient of this variation may be positive or negative, being dependent on the wavelength of the exciting radiation. Typical efficiency temperature curves for a self-activated zinc sulphide phosphor are given in Fig. 1 for different excitation wave-lengths. This behaviour has been previously observed by Schön1, and recently Williams and Eyring2 have attempted to explain it in terms of the intrinsic luminescence centre configurations. Their treatment gives a slow rise in efficiency with temperature, of an exponential form for longer wavelength excitation ; but it cannot explain the fall in efficiency with temperature at shorter wave-lengths.
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References
Schön, M., Naturwiss., 31, 169 (1943).
Williams, F. E., and Eyring, H., J. Chem. Phys., 15, 289 (1947).
Gisolf, J. H., unpublished work (1938) quoted in ref. 4.
Möglich, F., and Rompe, R., Z. Phys., 119, 472 (1942).
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GARLICK, G., GIBSON, A. Luminescence Efficiency Changes in Zinc Sulphide Phosphors Below Room Temperature. Nature 161, 359 (1948). https://doi.org/10.1038/161359a0
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DOI: https://doi.org/10.1038/161359a0
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