Nature of the Inhomogeneous Broadening of Optical Spectra in Eu^<3+> doped Y_2O_3 Crystals Studied by Optical-RF Double Resonsnce

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The nature of the inhomogencous broadening of optical spectra has been investigated for Eu^<3+> ions embedded in pure and impurity ion (Sc^<3+> or Zr^<4+>) doped Y_2O_3 crystals. High-resolution absorption spectra of the ^7F_0-^5D_0 transitions have been taken as excitation spectra of luminescence. Using optical-radio-frequency (rf) double resonance technique, the distribution of two hyperfine transitions (ω_1:I〓 = ± 1/2 to ± 3/2 and ω_2:I〓 = ±3/2 to ±5/2) in the ^7F_0 ground state were measured as afunction of the optical excitation energy and displayed as a 2-dimensional map on the optical and rf axes. Thus the ionic sites are labeled by three parameters and some new sites were distinguished by using both ω_1 and ω_2. The single crystals with a disorder systematically controlled by doping of various ions (Sc^<3+> and Zr^<4+>) were investigated and the character of the inhomogeneous distribution was found to be strongly dependent on the doped ions. By applying the mapping method to the Sc^<3+> doped Y_2O_3, the individual sites are discriminated inside the inhomogencously broadened optical spectra, while the discrete peaks coalesce into a single broad peak in the optical spectrum at higher concentration.
社団法人日本物理学会の論文
2003-02-15