Abstract

In earlier papers it was shown that a group of phosphors show an approximately linear increase of their efficiency with increasing intensity of excitation in certain ranges of that intensity. Tentatively, these observations and the interdependence of the effects of intensity, temperature, and “poisoning” found in the same phosphors were interpreted by the assumption that a non-radiative process of first-order kinetics competes with an emission process of the second order. This type of hypothesis, however, does not easily account for more than linear dependences of efficiency on intensity. Indications of such dependences had been found in our earlier work. In view of the possible theoretical significance of these results, a number of measures were taken to eliminate possible sources of errors. New measurements were carried out on a suitable series of poisoned zinc-cadmium sulfide phosphors. The existence of regions in which the intensity dependence of efficiency was even stronger than quadratic was ascertained. Furthermore,a remarkably strong dependence of the efficiency on the carefully controlled concentrations of the poison was found. The problems raised by these effects are briefly discussed.

© 1949 Optical Society of America

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References

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  1. Demonstration by F. Urbach at Winter Meeting of the Optical Society of America, March 7–9, 1946, in Cleveland, Ohio.
  2. D. Pearlman and F. Urbach, J. Opt. Soc. Am. 36, 709 (1946).
  3. N. R. Nail, D. Pearlman, and F. Urbach, in Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948), p. 190.
  4. H. A. Klasens, Nature 158, 306 (1946).
    [Crossref]
  5. M. E. Wise and H. A. Klasens, J. Opt. Soc. Am. 38, 226 (1948).
    [Crossref] [PubMed]

1948 (1)

1946 (2)

Klasens, H. A.

Nail, N. R.

N. R. Nail, D. Pearlman, and F. Urbach, in Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948), p. 190.

Pearlman, D.

D. Pearlman and F. Urbach, J. Opt. Soc. Am. 36, 709 (1946).

N. R. Nail, D. Pearlman, and F. Urbach, in Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948), p. 190.

Urbach, F.

D. Pearlman and F. Urbach, J. Opt. Soc. Am. 36, 709 (1946).

N. R. Nail, D. Pearlman, and F. Urbach, in Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948), p. 190.

Demonstration by F. Urbach at Winter Meeting of the Optical Society of America, March 7–9, 1946, in Cleveland, Ohio.

Wise, M. E.

J. Opt. Soc. Am. (2)

Nature (1)

H. A. Klasens, Nature 158, 306 (1946).
[Crossref]

Other (2)

Demonstration by F. Urbach at Winter Meeting of the Optical Society of America, March 7–9, 1946, in Cleveland, Ohio.

N. R. Nail, D. Pearlman, and F. Urbach, in Preparation and Characteristics of Solid Luminescent Materials (John Wiley and Sons, Inc., New York, 1948), p. 190.

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Figures (9)

F. 1
F. 1

Check of linearity of measuring system.

F. 2
F. 2

Independence of emission spectra on exciting intensity for zinc cadmium sulfide, 400 ppm Ag, 4.8 ppm Ni.

F. 3
F. 3

Independence of emission spectra on poison concentration for zinc cadmium sulfide.

F. 4
F. 4

Dependence of brightness of emission upon exciting intensity for zinc-cadmium sulfide, silver phosphors with different amounts of nickel.

F. 5
F. 5

Build-up of brightness during excitation for zinc cadmium sulfide, 400-ppm Ag.

F. 6
F. 6

Dependence of efficiency upon exciting intensity for zinc cadmium sulfide silver phosphors.

F. 7
F. 7

Comparison of linear and superlinear phosphors.

F. 8
F. 8

Effect of poisoning on efficiency of zinc cadmium sulfide.

F. 9
F. 9

Dependence of efficiency upon concentration of poison for various values of exciting intensity.

Equations (13)

Equations on this page are rendered with MathJax. Learn more.

I = B + C ( B ) 1 2 .
B = I ;
B = I 2 / C 2 ,
C = a P e E / k T ,
( B ) 1 2 = a P e E / k T ,
d n / d t = α J ( N y ) β n y γ n ( P x ) + κ x = 0 . d h / d t = y h x π ( N y ) h = 0 . d x / d t = γ n ( P x ) h x κ x = 0 . d y / d t = α J ( N y ) + π ( N y ) h y β n y = 0 .
N y ,
P x ,
π N ,
γ P κ ,
γ P .
I = B + ( γ / β ) P ( B ) 1 2 .
N y , P x , π N , γ P κ , γ P π N .