Abstract

Lead is shown to be an activator for the phosphorescence of calcium and strontium tungstates, the optimum concentration being about 0.01 mol of PbWO4 per mol of alkaline earth tungstate. In addition, it was observed that much higher concentrations of lead produce an enormous increase in both the fluorescent and phosphorescent power of strontium tungstate. The optimum concentrations of lead for this effect are 0.2 and 0.4 mol fraction for the fluorescence and phosphorescence, respectively. High concentrations of lead in calcium tungstate serve only to decrease the luminescent power.

© 1933 Optical Society of America

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References

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  1. de Rohden, Ann. de Chimie 3, 338 (1915).
  2. E. Tiede and A. Schleede, Zeits. f. Electrochemie 29, 304 (1923).
  3. A. Schleede and Tien-Huan Tsao, Berichte 62B, 763 (1929).
  4. F. E. Swindells, J. Opt. Soc. Am. and R. S. I. 16, 165 (1928).
    [CrossRef]

1929 (1)

A. Schleede and Tien-Huan Tsao, Berichte 62B, 763 (1929).

1928 (1)

F. E. Swindells, J. Opt. Soc. Am. and R. S. I. 16, 165 (1928).
[CrossRef]

1923 (1)

E. Tiede and A. Schleede, Zeits. f. Electrochemie 29, 304 (1923).

1915 (1)

de Rohden, Ann. de Chimie 3, 338 (1915).

de Rohden,

de Rohden, Ann. de Chimie 3, 338 (1915).

Schleede, A.

A. Schleede and Tien-Huan Tsao, Berichte 62B, 763 (1929).

E. Tiede and A. Schleede, Zeits. f. Electrochemie 29, 304 (1923).

Swindells, F. E.

F. E. Swindells, J. Opt. Soc. Am. and R. S. I. 16, 165 (1928).
[CrossRef]

Tiede, E.

E. Tiede and A. Schleede, Zeits. f. Electrochemie 29, 304 (1923).

Tsao, Tien-Huan

A. Schleede and Tien-Huan Tsao, Berichte 62B, 763 (1929).

Ann. de Chimie (1)

de Rohden, Ann. de Chimie 3, 338 (1915).

Berichte (1)

A. Schleede and Tien-Huan Tsao, Berichte 62B, 763 (1929).

J. Opt. Soc. Am. and R. S. I. (1)

F. E. Swindells, J. Opt. Soc. Am. and R. S. I. 16, 165 (1928).
[CrossRef]

Zeits. f. Electrochemie (1)

E. Tiede and A. Schleede, Zeits. f. Electrochemie 29, 304 (1923).

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Figures (4)

Fig. 1
Fig. 1

Fluorescence of calcium tungstate-lead tungstate mixtures; exposure 60 kv, 2 m.a., 2.0 secs., 1 meter distance.

Fig. 2
Fig. 2

Phosphorescence of calcium tungstate-lead tungstate mixtures; exposure 60 kv, 2 m.a., 10 sec., 30 cm distance; after 15 second interval placed in contact with film for 5 minutes.

Fig. 3
Fig. 3

Fluorescence of strontium tungstate-lead tungstate mixtures; exposure 60 kv, 2 m.a., 3.5 sec., 1 meter-distance.

Fig. 4
Fig. 4

Phosphorescence of strontium tungstate-lead tungstate mixtures; exposure 60 kv, 2 m.a., 75 sec., 30 cm distance; after 15 second interval placed in contact with film for 5 minutes.