Abstract

A number of recent researches have been concerned with magnesium germanate phosphors. An improved such phosphor is reported here having over twice the brightness of the previous compositions as prepared in this laboratory, and which shows peak luminescence efficiency at temperatures near 350°C. Temperature dependence of luminescence studies on the improved composition and the others showed little difference between them in this respect though the data are in striking contrast with those reported by others. A partial explanation of the pronounced temperature effect (for temperatures <350°C) is presented and is based upon the broadening of the excitation spectrum at elevated temperatures in such a way as to increase absorption of the exciting radiation (3650A). Data are presented showing differences in the temperature dependence relation effected by wave-length of excitation and method of measurement; in addition, curves are included showing the variation of phosphorescence (t=1/120 sec.) with temperature as well as curves showing excitation and emission characteristics of the phosphor. Finally a practical application of this high temperature luminescence is demonstrated in the color corrected high pressure mercury lamps the emission characteristics of which are briefly discussed.

© 1950 Optical Society of America

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References

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  1. S. H. Patten and F. E. Williams, J. Opt. Soc. Am. 39, 702 (1949).
    [Crossref]
  2. F. E. Williams, J. Opt. Soc. Am. 37, 302 (1947).
    [Crossref]
  3. H. W. Leverenz, U. S. Pat.2,066,044 (1936).
  4. F. E. Williams, U. S. Pat.2,447,448 (1948).
  5. H. W. Leverenz, Luminescence of Solids (John Wiley and Sons, Inc., New York, 1950).
  6. N. Thayer, Trans. Electrochem. Soc. 87, 424 (1945).
  7. G. R. Fonda and F. Seitz, editors, Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948) p. 112.
  8. F. A. Kroger, Some Aspects of the Luminescence of Solids (Elsevier Publishing Company Inc., New York, 1948), p. 64.
  9. G. F. J. Garlick and A. F. Gibson, Nature 161, 359 (1948).
    [Crossref]
  10. F. E. Williams and Henry Eyring, J. Chem. Phys. 15, 289 (1947).
    [Crossref]
  11. E. W. Beggs, Trans. Illum. Eng. Soc.42 (4), 435.

1949 (1)

1948 (1)

G. F. J. Garlick and A. F. Gibson, Nature 161, 359 (1948).
[Crossref]

1947 (2)

F. E. Williams and Henry Eyring, J. Chem. Phys. 15, 289 (1947).
[Crossref]

F. E. Williams, J. Opt. Soc. Am. 37, 302 (1947).
[Crossref]

1945 (1)

N. Thayer, Trans. Electrochem. Soc. 87, 424 (1945).

Beggs, E. W.

E. W. Beggs, Trans. Illum. Eng. Soc.42 (4), 435.

Eyring, Henry

F. E. Williams and Henry Eyring, J. Chem. Phys. 15, 289 (1947).
[Crossref]

Garlick, G. F. J.

G. F. J. Garlick and A. F. Gibson, Nature 161, 359 (1948).
[Crossref]

Gibson, A. F.

G. F. J. Garlick and A. F. Gibson, Nature 161, 359 (1948).
[Crossref]

Kroger, F. A.

F. A. Kroger, Some Aspects of the Luminescence of Solids (Elsevier Publishing Company Inc., New York, 1948), p. 64.

Leverenz, H. W.

H. W. Leverenz, U. S. Pat.2,066,044 (1936).

H. W. Leverenz, Luminescence of Solids (John Wiley and Sons, Inc., New York, 1950).

Patten, S. H.

Thayer, N.

N. Thayer, Trans. Electrochem. Soc. 87, 424 (1945).

Williams, F. E.

S. H. Patten and F. E. Williams, J. Opt. Soc. Am. 39, 702 (1949).
[Crossref]

F. E. Williams, J. Opt. Soc. Am. 37, 302 (1947).
[Crossref]

F. E. Williams and Henry Eyring, J. Chem. Phys. 15, 289 (1947).
[Crossref]

F. E. Williams, U. S. Pat.2,447,448 (1948).

J. Chem. Phys. (1)

F. E. Williams and Henry Eyring, J. Chem. Phys. 15, 289 (1947).
[Crossref]

J. Opt. Soc. Am. (2)

Nature (1)

G. F. J. Garlick and A. F. Gibson, Nature 161, 359 (1948).
[Crossref]

Trans. Electrochem. Soc. (1)

N. Thayer, Trans. Electrochem. Soc. 87, 424 (1945).

Other (6)

G. R. Fonda and F. Seitz, editors, Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948) p. 112.

F. A. Kroger, Some Aspects of the Luminescence of Solids (Elsevier Publishing Company Inc., New York, 1948), p. 64.

E. W. Beggs, Trans. Illum. Eng. Soc.42 (4), 435.

H. W. Leverenz, U. S. Pat.2,066,044 (1936).

F. E. Williams, U. S. Pat.2,447,448 (1948).

H. W. Leverenz, Luminescence of Solids (John Wiley and Sons, Inc., New York, 1950).

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Figures (8)

Fig. 1
Fig. 1

Spectral distribution of the luminescence of magnesium fluorogermanate.

Fig. 2
Fig. 2

Excitation spectrum of magnesium germanates (from reflectivity data).

Fig. 3
Fig. 3

Temperature dependence of the luminescence of magnesium germanate phosphors.

Fig. 4
Fig. 4

Effect of exciting wave-length on the temperature dependence of the luminescence of magnesium fluorogermanate.

Fig. 5
Fig. 5

Temperature dependence of the long and short wave-length emission of magnesium fluorogermanate.

Fig. 6
Fig. 6

Effect of zinc on the temperature dependence of the luminescence of magnesium fluorogermanate.

Fig. 7
Fig. 7

Temperature dependence of luminescence curves obtained using different measuring techniques. Excitation: 2537A.

Fig. 8
Fig. 8

Variation with time and temperature of the luminescence of magnesium fluorogermanate.