Infrared Excitation Processes for the Visible Luminescence of Er3+, Ho3+, and Tm3+ in Yb3+-Sensitized Rare-Earth Trifluorides

Ralph A. Hewes and James F. Sarver
Phys. Rev. 182, 427 – Published 10 June 1969
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Abstract

Infrared reflectance and excitation measurements, together with studies of the dependence of the luminescence on excitation intensity and sensitizer concentration, in the fluorides of La, Gd, and Y doped with Yb3+ and Er3+, Ho3+, or Tm3+ indicate that infrared quantum counteraction is accomplished by absorption of energy in the Yb3+ ions followed by two (for Ho3+ or Er3+) or three (for Tm3+) transfers to the activator, resulting in production of strong visible luminescence from absorption in the Yb3+(F722F522) band. Saturation of the population of intermediate levels, in the case of Tm3+-activated materials, was observed and is believed to account for previous results which were interpreted as evidence of a so-called "cooperative sensitization," in which only two (simultaneous) transfers were required.

  • Received 5 December 1968

DOI:https://doi.org/10.1103/PhysRev.182.427

©1969 American Physical Society

Authors & Affiliations

Ralph A. Hewes and James F. Sarver

  • Lighting Research Laboratory, Lamp Division, General Electric Company, Cleveland, Ohio 44112

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Vol. 182, Iss. 2 — June 1969

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