Abstract

Absorption and luminescence phenomena in NaCl:Pb phosphors have been found to be rather complex. Melt-grown NaCl:Pb has an asymmetrical, 2730A-peaked absorption band. The variation of emission spectrum with wave-length of excitation within this band shows that it consists of two poorly resolved absorption bands, one peaking at 2730A and the other at 2900A. At low Pb concentrations, irradiation into the first of these causes a near-ultraviolet emission peaking at 3200A; irradiation into the second causes a visible emission peaking at about 4500A. At high Pb concentrations, irradiation into the first band gives a second near-ultraviolet emission band peaking at 3850A in addition to the one peaking at 3200A. Precipitated NaCl:Pb shows all the above phenomena, and in addition, has an excitation band peaking at 2600A, producing simultaneously a 3300A-peaked emission and a visible emission. The NaCl:Pb phosphors are unstable, deteriorating after a few days at room temperature and more rapidly at 130°. X-irradiation of these phosphors destroys the above absorption and emissions, and gives a print-out effect due apparently to the formation of colloidal Pb. The x-rayed material can be excited by near ultraviolet to give a red emission, peaking at about 6100A. Some suggestions concerning the interpretation of the above phenomena are given.

© 1950 Optical Society of America

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References

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  1. R. Hilsch, Zeits. f. Physik 44, 860 (1927).
    [Crossref]
  2. M. Forro, Zeits. f. Physik 56, 534 (1929).
    [Crossref]
  3. H. Lorenz, Zeits. f. Physik 46, 558 (1928).
    [Crossref]
  4. M. Kato, Sci. Pap. Physchem. Res. Tokyo 41, 113 (1943).
  5. S. Kyropoulos, Zeits. f. anorg. allgem. Chemie 154, 308 (1926).
    [Crossref]
  6. W. Koch, Zeits. f. Physik 57, 638 (1929).
    [Crossref]
  7. A. Arsanjewa, Zeits. f. Physik57163 (1929).
  8. J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).
  9. J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).
  10. W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
    [Crossref]
  11. H. Fesefeldt, Zeits. f. Physik 64, 741 (1930).
    [Crossref]

1949 (3)

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

1943 (1)

M. Kato, Sci. Pap. Physchem. Res. Tokyo 41, 113 (1943).

1930 (1)

H. Fesefeldt, Zeits. f. Physik 64, 741 (1930).
[Crossref]

1929 (3)

M. Forro, Zeits. f. Physik 56, 534 (1929).
[Crossref]

W. Koch, Zeits. f. Physik 57, 638 (1929).
[Crossref]

A. Arsanjewa, Zeits. f. Physik57163 (1929).

1928 (1)

H. Lorenz, Zeits. f. Physik 46, 558 (1928).
[Crossref]

1927 (1)

R. Hilsch, Zeits. f. Physik 44, 860 (1927).
[Crossref]

1926 (1)

S. Kyropoulos, Zeits. f. anorg. allgem. Chemie 154, 308 (1926).
[Crossref]

Arsanjewa, A.

A. Arsanjewa, Zeits. f. Physik57163 (1929).

Burstein, E.

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

Evans, L. W.

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

Fesefeldt, H.

H. Fesefeldt, Zeits. f. Physik 64, 741 (1930).
[Crossref]

Forro, M.

M. Forro, Zeits. f. Physik 56, 534 (1929).
[Crossref]

Ginther, R. J.

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

Hilsch, R.

R. Hilsch, Zeits. f. Physik 44, 860 (1927).
[Crossref]

Kato, M.

M. Kato, Sci. Pap. Physchem. Res. Tokyo 41, 113 (1943).

Klick, C. C.

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

Koch, W.

W. Koch, Zeits. f. Physik 57, 638 (1929).
[Crossref]

Kyropoulos, S.

S. Kyropoulos, Zeits. f. anorg. allgem. Chemie 154, 308 (1926).
[Crossref]

Lorenz, H.

H. Lorenz, Zeits. f. Physik 46, 558 (1928).
[Crossref]

Schulman, J. H.

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

Weyl, W. A.

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

White, M.

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

J. Electrochem. Soc. (1)

W. A. Weyl, J. H. Schulman, L. W. Evans, and R. J. Ginther, J. Electrochem. Soc. 95, 70 (1949).
[Crossref]

Phys. Rev. (2)

J. H. Schulman, E. Burstein, L. W. Evans, R. J. Ginther, and M. White, Phys. Rev. 76, 178 (1949).

J. H. Schulman, R. J. Ginther, C. C. Klick, and L. W. Evans, Phys. Rev. 76, 459 (1949).

Sci. Pap. Physchem. Res. Tokyo (1)

M. Kato, Sci. Pap. Physchem. Res. Tokyo 41, 113 (1943).

Zeits. f. anorg. allgem. Chemie (1)

S. Kyropoulos, Zeits. f. anorg. allgem. Chemie 154, 308 (1926).
[Crossref]

Zeits. f. Physik (6)

W. Koch, Zeits. f. Physik 57, 638 (1929).
[Crossref]

A. Arsanjewa, Zeits. f. Physik57163 (1929).

R. Hilsch, Zeits. f. Physik 44, 860 (1927).
[Crossref]

M. Forro, Zeits. f. Physik 56, 534 (1929).
[Crossref]

H. Lorenz, Zeits. f. Physik 46, 558 (1928).
[Crossref]

H. Fesefeldt, Zeits. f. Physik 64, 741 (1930).
[Crossref]

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Figures (13)

Fig. 1
Fig. 1

Composition of melt-grown crystals of NaCl:Pb vs. composition of melt.

Fig. 2
Fig. 2

Composition of precipitated NaCl:Pb vs. Pb content of solution.

Fig. 3
Fig. 3

Absorption spectra of melt-grown NaCl:Pb crystals.

Fig. 4
Fig. 4

Effect of 130° heat treatment on absorption spectrum of a melt-grown NaCl:Pb crystal.

Fig. 5
Fig. 5

Absorption coefficients of melt-grown NaCl:Pb crystals vs. Pb content.

Fig. 6
Fig. 6

Excitation spectra of a melt-grown NaCl:Pb crystal. (a) Luminescence viewed through Corning Filters 9700 and 5840. (b) Luminescence viewed through Corning Filters 9700 and 3387.

Fig. 7
Fig. 7

Relation of excitation bands of melt-grown NaCl:Pb to its absorption band at 2730A. (1) Absorption spectrum. (2) Excitation band for U.V. emission (2730A peak). (3) Excitation band for visible emission (2900A peak).

Fig. 8
Fig. 8

Excitation spectra of precipitated NaCl:Pb. (a) Luminescence viewed through Corning Filters 9700 and 5840. (b) Luminescence viewed through Corning Filters 9700 and 3387.

Fig. 9
Fig. 9

Emission spectra of precipitated NaCl:Pb as a function of exciting wave-length. (a) 2900A excitation (4500A-peaked emission is weak and is lost in reproduction). (b) 2730A excitation. (c) 2537A excitation.

Fig. 10
Fig. 10

Emission spectra of melt-grown NaCl:Pb as a function of exciting wave-length. (a) 2900A excitation. (b) 2730A excitation.

Fig. 11
Fig. 11

Effect of x-rays on absorption spectrum of NaCl:Pb (Arsanjewa). (a) 10 minute x-ray treatment. (b) 2 hour x-ray treatment. (c) 10 hour x-ray treatment. Circles=x-rayed crystal; crosses=original crystal.

Fig. 12
Fig. 12

Radiograph made on NaCl:Pb screen.

Fig. 13
Fig. 13

Emission spectrum of x-rayed NaCl:Pb under 3650A excitation.

Tables (1)

Tables Icon

Table I Effect of aging on brightness of NaCl:Pb precipitate.