Letter | Published:

A Characteristic Example of Re-trapping in Phosphorescence

Naturevolume 166page70 (1950) | Download Citation

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Abstract

THERE has been much discussion about the existence of re-trapping (electronic recapture) in phosphorescence1. One of my experiments seems to demonstrate the existence of re-trapping: electrons leave the deep traps and get into the short-life traps. I used a calcium sulphide, (bismuth activator) phosphor of very long afterglow. This sulphide was strongly excited by ultra-violet radiations of about 0.36 µ from a mercury vapour arc; it was then heated up to 135° C. until complete extinction was reached. When the sulphide had cooled down to room temperature, it was submitted to the infra-red radiations of a 300-W. electric lamp filtered by a black manganese–iron glass with transparent range of 0.8 µ–4µ with some peaks between 1 µ and 4 µ.

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References

  1. 1

    Garlick, G. F. J., Cornell Symposium of the American Physical Society, 87 (1948); Proc. Phys. Soc. (June 1, 1948). Urbach, F., loc. cit., 295. Ellickson, R. T., and Parker, W. T., loc. cit., 331. Williams and Eyring, J. Chem. Phys., 15, 289 (1947), Curie, D., C.R. Acad. Sci., Paris, 229, 193 (1949); 229, 1321 (1949).

  2. 2

    Lenard, P., “Handbk. für exper. Phys.”, 1, 125 (1928).

  3. 3

    Garlick, G. F. J., and Mason, D. E., J. Electrochem. Soc. U.S.A., 96, 90 (1949).

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  1. Faculté des Sciences, 12 rue Cuvier, Paris

    • D. CURIE JUN.

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https://doi.org/10.1038/166070a0

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