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

Full Article  |  PDF Article
OSA Recommended Articles
The Luminescence of Photo-Conducting Phosphors

G. F. J. Garlick and A. F. Gibson
J. Opt. Soc. Am. 39(11) 935-941 (1949)

Theory of the Luminescence of Sulfide Phosphors

Shepard Roberts and Ferd E. Williams
J. Opt. Soc. Am. 40(8) 516-520 (1950)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription