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- W2024275234 endingPage "13840" @default.
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- W2024275234 abstract "Single crystals of ${mathrm{LaCl}}_{3}{:1%mathrm{}mathrm{Er}}^{3+}$ were grown by the Bridgman technique. ${mathrm{Er}}^{3+}$ substitutes for ${mathrm{La}}^{3+}$ and has a site symmetry of ${C}_{3h}$ in ${mathrm{LaCl}}_{3}.$ Seventy-three energy levels of ${mathrm{Er}}^{3+}$ were determined up to $45000{mathrm{cm}}^{mathrm{ensuremath{-}}1}$ from absorption, excitation, and luminescence spectra measured over the temperature range 4.2--293 K. A correlated crystal-field analysis was done by fitting 16 atomic, four crystal-field, and one correlated crystal-field parameters to the experimental Stark levels. The fit is excellent with a standard deviation of $9.0{mathrm{cm}}^{mathrm{ensuremath{-}}1}.$ On the basis of the wave functions thus obtained the oscillator strengths for the transitions from the ${}^{4}{I}_{15/2}(1)$ ground state to all the levels up to $45000{mathrm{cm}}^{mathrm{ensuremath{-}}1}$ were calculated by fitting seven complex ${A}_{t,p}^{ensuremath{lambda}}$ intensity parameters to 47 observed oscillator strengths. The intensity distribution among the crystal-field components was then calculated for the inter-excited-state transition ${}^{4}{I}_{11/2}{ensuremath{rightarrow}}^{4}{F}_{7/2}$ which plays an important role in an excited-state-absorption upconversion process." @default.
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- W2024275234 date "1997-12-01" @default.
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- W2024275234 title "Infrared-to-visible upconversion in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>LaCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mo>:</mml:mo><mml:mn>1</mml:mn><mml:mo>%</mml:mo><mml:mi mathvariant=normal /><mml:mi mathvariant=normal>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><…" @default.
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- W2024275234 doi "https://doi.org/10.1103/physrevb.56.13830" @default.
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