Luminescent Properties of Tb^<3+> in Oxygen-Dominated Compounds
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Host lattice dependences of luminescence spectra and relaxation properties of Tb^<3+> are described. Reduced matrix elements relevant to the transitions are calculated and compared with observations. The spectra and the decay times of the ^5D_4⟶^7F_J transitions are in qualitative agreement with the calculations. The electric-dipole transition of ^5D_4⟶^7F_5 has the largest probability in the ^5D_4⟶^7F_J emission transitions within the framework of the Judd-Ofelt approximation. When the crystal field acting on Tb^<3+> is very strong, the intensity of ^5D_4⟶^7F_3 can become comparable to that of ^5D_4⟶^7F_5. Magnetic-dipole transitions always have the largest probability for ^5D_4⟶7F_5. Spontaneous multiphonon relaxation of ^5D_3⟶^5D_4 is sometimes a dominant decay mechanism of the ^5D_3 state. The observed multiphonon relaxation rates are ∼2×10^2 in YPO_4-, ∼8×10^3 in YBO_3- and ∼2×10^4 in ScBO_3-groups in units of sec^<-1>.
- 社団法人日本物理学会の論文
- 1972-04-05
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