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- W2039850611 abstract "The paper compares the mechanisms that enable the upconverted green emission ${(}^{5}{stackrel{ensuremath{rightarrow}}{{S}_{2}}}^{5}{I}_{8})$ of the ${mathrm{Ho}}^{3+}$ ion under infrared excitation (700--920 nm) in several crystalline hosts $({mathrm{YAlO}}_{3},$ ${mathrm{YLiF}}_{4},$ ${mathrm{Y}}_{3}{mathrm{Sc}}_{2}{mathrm{Ga}}_{3}{mathrm{O}}_{12},$ and ${mathrm{BaY}}_{2}{mathrm{F}}_{8}).$ Parameters involved in the upconversion such as excited-state absorption and cross-relaxation rates were determined from spectroscopic measurements. A system of differential equation (rate equations) was used to describe the upconversion mechanism and was numerically solved. The results were compared with experimental data. A reduction of this system to a three-level ``simplified system'' is presented, which includes only the ground level, the emitting level, and the intermediate level. The differences between the photon-avalanche mechanism and the looping mechanism are discussed and analyzed according to this simplified system." @default.
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- W2039850611 date "2002-06-14" @default.
- W2039850611 modified "2023-10-17" @default.
- W2039850611 title "Evaluation of the upconversion mechanisms in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Ho</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-doped crystals: Experiment and theoretical modeling" @default.
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- W2039850611 doi "https://doi.org/10.1103/physrevb.65.235119" @default.
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