Energy transfer and cooperative optical transitions in rare-earth doped inorganic materials-1〜3-

T. Kushida

R. M. Macfarlane, John Hegarty, J. Ryan +1 more

Krzysztof Swiatek, Zbigniew Kaliński

David S. Knowles

Takashi Kushida

Estimations are made of the critical concentration of energy-acceptor ions for which the average efficiency of the excitation transfer from energy-donor ions is 1/2. This gives a measure of the activator concentration at which Inokuti and Hirayama's theory is no longer applicable. Study is also made of the dominant multipole interaction responsible for the energy transfer between rare earth ions in inorganic solids. Finally, importance of the J -selection rule in the determination of the dominant interaction term in the resonance transfer and cooperative processes is emphasized.

Takashi Kushida

Using the transition probabilities obtained by the method of the previous paper I, efficiencies of several infrared-to-visible conversion processes, as well as rates for resonance energy transfer and cooperative optical transition, are calculated and compared with experiments. Agreement seems to be satisfactory if the approximations adopted in the computation are considered. Comparisons are also made between the present estimates and other calculations.