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A Characteristic Example of Re-trapping in Phosphorescence

Nature volume 166, page 70 (08 July 1950) | Download Citation



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.


  1. 1.

    , Cornell Symposium of the American Physical Society, 87 (1948); Proc. Phys. Soc. (June 1, 1948). , loc. cit., 295. , and , loc. cit., 331. and , J. Chem. Phys., 15, 289 (1947), , C.R. Acad. Sci., Paris, 229, 193 (1949); 229, 1321 (1949).

  2. 2.

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

  3. 3.

    , and , J. Electrochem. Soc. U.S.A., 96, 90 (1949).

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  1. Faculté des Sciences, 12 rue Cuvier, Paris. Feb. 22.

    • D. CURIE JUN.


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