Abstract

The paper presents the results of a study of the build-up and decay of some 200 samples of silicate, tungstate, molybdate and sulphide phosphors, excited by Bg 2536A radiation. The normal silicates decay at first exponentially, with a time constant of the order of 10<sup>-2</sup> sec. This initial rate is independent of the intensity and the duration of the excitation, and varies little among different samples of a given class (e.g., Zn<sub>2</sub>SiO<sub>4</sub>- Mn). The later decay is slower, and does vary markedly from sample to sample, and depends on the intensity and duration of the excitation. CaWO<sub>4</sub> decays too rapidly to be measured with the apparatus used (<50 microseconds); the decay of MgWO<sub>4</sub> lasts about 2 × 10<sup>-4</sup> sec.; both these tungstates show a very faint long phosphorescence which can be enhanced slightly by addition of impurities. The red luminescence contributed by Sm in these and other “pure” phosphors decays exponentially with a time constant of about 7 × 10<sup>-4</sup> sec. Sulphides have complicated decay characteristics, dependent on the intensity and duration of the excitation. Comparison is made with the results of a study of decay after electron bombardment, and with other published data.

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  1. R. B. Nelson and R. P. Johnson, Phys. Rev. 55, 592(A) (1939); Nelson, Johnson and Nottingham, J. App. Phys. 10, 335 (1939).
  2. G. R. Fonda, J. App. Phys. 10, 408 (1939).
  3. This term is used for convenience, without prejudice as to the nature of the entities involved.
  4. It appears that the older phosphors differed chiefly in efficiency, not in any essentials of behavior, from the materials recently developed for television and fluorescent lighting. See, for example, E. L. Nichols and E. Merritt, Studies in Luminescence (Washington, 1912). A fairly comprehensive bibliography is given by P. Pringsheim, Fluorescenz und Plhosphorescenz (Berlin, 1928, third edition); for a supplementary bibliography see H. Rupp, Die Leuchtimassen und ihre Verwendung (Berlin, 1937).
  5. A. Schleede and B. Bartels, Zeits. f. tech. Physik 19, 363 (1938).
  6. W. de Groot, Physica 6, 275 (1939).
  7. N. C. Beese, J. Opt. Soc. Am. 29, 26 (1939).

Bartels, B.

A. Schleede and B. Bartels, Zeits. f. tech. Physik 19, 363 (1938).

Beese, N. C.

N. C. Beese, J. Opt. Soc. Am. 29, 26 (1939).

de Groot, W.

W. de Groot, Physica 6, 275 (1939).

Fonda, G. R.

G. R. Fonda, J. App. Phys. 10, 408 (1939).

Johnson, R. P.

R. B. Nelson and R. P. Johnson, Phys. Rev. 55, 592(A) (1939); Nelson, Johnson and Nottingham, J. App. Phys. 10, 335 (1939).

Merritt, E.

It appears that the older phosphors differed chiefly in efficiency, not in any essentials of behavior, from the materials recently developed for television and fluorescent lighting. See, for example, E. L. Nichols and E. Merritt, Studies in Luminescence (Washington, 1912). A fairly comprehensive bibliography is given by P. Pringsheim, Fluorescenz und Plhosphorescenz (Berlin, 1928, third edition); for a supplementary bibliography see H. Rupp, Die Leuchtimassen und ihre Verwendung (Berlin, 1937).

Nelson, R. B.

R. B. Nelson and R. P. Johnson, Phys. Rev. 55, 592(A) (1939); Nelson, Johnson and Nottingham, J. App. Phys. 10, 335 (1939).

Nichols, E. L.

It appears that the older phosphors differed chiefly in efficiency, not in any essentials of behavior, from the materials recently developed for television and fluorescent lighting. See, for example, E. L. Nichols and E. Merritt, Studies in Luminescence (Washington, 1912). A fairly comprehensive bibliography is given by P. Pringsheim, Fluorescenz und Plhosphorescenz (Berlin, 1928, third edition); for a supplementary bibliography see H. Rupp, Die Leuchtimassen und ihre Verwendung (Berlin, 1937).

Schleede, A.

A. Schleede and B. Bartels, Zeits. f. tech. Physik 19, 363 (1938).

Other

R. B. Nelson and R. P. Johnson, Phys. Rev. 55, 592(A) (1939); Nelson, Johnson and Nottingham, J. App. Phys. 10, 335 (1939).

G. R. Fonda, J. App. Phys. 10, 408 (1939).

This term is used for convenience, without prejudice as to the nature of the entities involved.

It appears that the older phosphors differed chiefly in efficiency, not in any essentials of behavior, from the materials recently developed for television and fluorescent lighting. See, for example, E. L. Nichols and E. Merritt, Studies in Luminescence (Washington, 1912). A fairly comprehensive bibliography is given by P. Pringsheim, Fluorescenz und Plhosphorescenz (Berlin, 1928, third edition); for a supplementary bibliography see H. Rupp, Die Leuchtimassen und ihre Verwendung (Berlin, 1937).

A. Schleede and B. Bartels, Zeits. f. tech. Physik 19, 363 (1938).

W. de Groot, Physica 6, 275 (1939).

N. C. Beese, J. Opt. Soc. Am. 29, 26 (1939).

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