Optical Spectra of Rare Earth Activated BaTiO3
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5.In reference 4 we quoted Jaffe and Banks [J. Electrochem. Soc. 102, 518 (1955)] as having observed line emission due to and band emission due to both emissions located near 600 mμ. It was puzzling to us why both valence states should have emissions of the same energy if the excited states of each ion were near the bottom of the conduction band. As a result, in reference 4 we attributed an emission near 380 mμ to and near 600 mμ to consistent with our expectations. The present paper does, indeed, confirm the results of Jaffe and Banks in that the trivalent Eu is responsible for an emission near 600 mμ. As is seen, this particular emission is due to a transition from the first excited multiplet to the ground multiplet. The 380 mμ emission in reference 4 must be due to a transition from an even higher excited state, perhaps the bottom of the conduction band, to the ground multiplet.
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