Abstract

Fluorescence quantum efficiency of several β-diketone chelates of Tb³⁺, Eu³⁺, and Sm³⁺ in solutions have been measured at 300°K. The highest quantum yield of the solutions investigated is found to be approximately 50%. The quantum efficiency is found to be dependent on the nature of the solvent, but is fairly independent of the wavelength of excitation, or the presence of oxygen. The fluorinated chelates, in general, have higher quantum yield in solutions, and therefore may be considered as possible material for liquid laser operation near room temperatures. The high quantum yield of the fluorinated chelates in solution also indicates that the time required for energy transfer in the chelates is at least an order of magnitude less than the time required for oxygen quenching in the triplet state.

© 1964 Optical Society of America

Measurement of Quantum Efficiencies of Fluorescence and Phosphorescence and Some Suggested Luminescence Standards

W. H. Melhuish
J. Opt. Soc. Am. 54(2) 183-186 (1964)

Laser Action in Rare Earth Chelates

A. Lempicki, H. Samelson, and C. Brecher
Appl. Opt. 4(S1) 205-213 (1965)

Mechanism of Energy Transfer in Some Rare-Earth Chelates

M. L. Bhaumik and M. A. El-Sayed
Appl. Opt. 4(S1) 214-215 (1965)

Absolute Fluorescent Quantum Efficiency of Sodium Salicylate*

Rinda Allison, Jay Burns, and A. J. Tuzzolino
J. Opt. Soc. Am. 54(6) 747-751 (1964)

Fluorescent Properties of Trivalent Rare Earths in Fluorite Structure Oxides*

Robert C. Linares
J. Opt. Soc. Am. 56(12) 1700-1702 (1966)