Er^<3+>高含有単結晶及びガラスの近赤外励起蛍光特性と4f励起準位の寿命

概要

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To investigate the relaxation processes of 4f excited levels of Er^<3+> the fluorescence spectra and lifetimes were measured for various single crystals and glasses containing a large amount of Er^<3+> which showed negative nonlinear absorption(NNA)effect. The lifetimes of the ^4I_<11/2> level decreased exponentially with an increase of phonon energy of the host. In Y_3Al_5O_<12> single crystals with various Er^<3+> concentrations, the lifetime of the ^4I_<11/2> level was unchanged, whereas that of the ^4I_<13/2> level was varied drastically with Er^<3+> concentration. Temperature dependence of the lifetime of the ^4I_<13/2> level was quite different between samples with high concentration of Er^<3+> and those with low concentration. In a YLiF_4 : Er^<3+> single crystal, the decay curve of the ^4I_<13/2>→^4I_<15/2> was varied drastically when excited wavelength was changed from 970nm(^4I_<11/2>←^4I_<15/2>)to 800 nm(^4I_9/2>←^4I_<15/2>). It was found that a cross relaxation process occurs in the ^4I_<9/2> level, resulting in anomalous decay and temperature dependence of the lifetime of the ^4I_<15/2> level.
社団法人日本セラミックス協会の論文
1999-12-01