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- W2080261650 abstract "The probability of cooperative energy transfer from two excited ions to a nearby ion is computed and compared with the probability of excitation by stepwise energy transfer. For ${mathrm{Yb}}^{3+}$ sensitization of ${mathrm{Er}}^{3+}$, ${mathrm{Ho}}^{3+}$, and ${mathrm{Tm}}^{3+}$ activated hosts, the cooperative transition rate from two excited ${mathrm{Yb}}^{3+}$ ions is estimated to be in the range ${10}^{7}$-${10}^{9}$ ${mathrm{sec}}^{ensuremath{-}1}$, depending on the degree of overlaps of absorption and emission bands. In the case of the ${mathrm{Er}}^{3+}$+${mathrm{Yb}}^{3+}$ and ${mathrm{Ho}}^{3+}$+${mathrm{Yb}}^{3+}$ systems, the dependence of output intensity on the exciting light intensity ${I}_{E}$ and the concentration of Yb cannot discriminate between cooperative and serial transfer, but estimates of the transfer probabilities show that the stepwise process dominates. It is suggested that the ${mathrm{Tb}}^{3+}$+${mathrm{Yb}}^{3+}$ system would be an excellent system in which to observe the cooperative effect unambiguously. In the ${mathrm{Tm}}^{3+}$+${mathrm{Yb}}^{3+}$ system also, we expect stepwise transfer to dominate except for unfeasibly low ${I}_{E}$." @default.
- W2080261650 created "2016-06-24" @default.
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- W2080261650 date "1970-01-01" @default.
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- W2080261650 title "Cooperative and Stepwise Excitation of Luminescence: Trivalent Rare-Earth Ions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Yb</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-Sensitized Crystals" @default.
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- W2080261650 doi "https://doi.org/10.1103/physrevb.1.70" @default.
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