Luminescence Properties of Y2O3:Tm3+ Whiskers Produced by Chemical Vapor Deposition

概要

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Luminescence properties of highly $\langle 100\rangle$-oriented Y2O3:Tm3+ whiskers obtained by chemical vapor deposition on Si substrate have been investigated over wide temperature range. It is found that at low temperatures the photoluminescence excitation spectra are composed of equally spaced components. The energy corresponding to the separation between these components is found to be in reasonable agreement with the energy of the prominent Raman line. This fact indicates the participation of lattice vibration in the excitation of the Tm3+ emission. Selective excitation by a photon energy corresponding to the transition to the upper-lying terminal level 3P2 of the Tm3+ ion causes temperature quenching of this emission with an activation energy of $\sim$0.42 eV. A model is proposed in which this temperature quenching is assigned to the process of thermal activation of the electron from the level 3P2 to the conduction band of Y2O3 followed by nonradiative recombination. In terms of the proposed model, charge transfer excitations from the valence band of Y2O3 to the 1D2 level of the Tm3+ ion are shown to exist.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-07-15