Abstract
The luminescence spectrum of KCl co-doped with divalent and trivalent europiumions was measured as a function of temperature in order to characterize novelspectral holes that appear in the blue emission from Eu2+. Theradiative energy transfer from Eu2+ to Eu3+ produces thespectral holes and induces the luminescence from Eu3+ responsiblefor the 5D0→7FJ (J = 0, 1, 2, 3, 4) transitions. Theholes and the induced luminescence are strongly associated with the thermalband broadening of the blue emission. In addition, the observed line splittingof the induced luminescence of Eu3+ is also discussed in terms of acrystal-field Hamiltonian.
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