Extreme hypersensitivity observed from ⁶H_15/2 to ⁶F_11/2 transition of Dy³⁺ in inorganic noncrystalline solids

Choi, Y.G., Curry, R.J., Park, B.J., Kim, K.H., Heo, J. and Hewak, D.W. (2005) Extreme hypersensitivity observed from ⁶H_15/2 to ⁶F_11/2 transition of Dy³⁺ in inorganic noncrystalline solids. Chemical Physics Letters, 403 (1-3), 29-34. (doi:10.1016/j.cplett.2004.12.108).

Abstract

Absorption transition from the ground ⁶H_15/2 state to the superimposed (⁶H_9/2, ⁶F_11/2) states, inverse transition of which leads the Dy³⁺: 1.3 micron luminescence, in noncrystalline Ge-As-S alloys is dramatically modified upon a least compositional adjustment by Ga and CsBr. The change in oscillator strength of the Dy³⁺: ⁶H_15/2 -- ⁶F_11/2 transition in our modified glasses is more sensitive to the local coordination structure of rare-earths compared to other hypersensitive transitions that have been previously observed in solid-state dielectric hosts. Preferential highly symmetric coordination in nearest-neighbouring shell of dysprosium with bromine in [GaS₃/2Br]- complexes, which are formed spontaneously during vitrification process of the host materials, is believed to be responsible for the behaviour.

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Contributors

Author: D.W. Hewak

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