Abstract
Photoluminescence and absorption spectra of Cd(Ga0.99Tm0.01)2S4 single crystals were investigated. We observed a broad and weak emission band at 4600 Å, a relatively strong emission band at 6200 Å, and several sharp and narrow emission bands in the wavelength region of 7600 to 8400 Å in the photoluminescence spectrum at 4.8 K. The two broad emission bands observed in shorter wavelength regions correspond to donor-acceptor pair recombination. The ten sharp and narrow emission bands observed in the near infrared region are associated with the 3F4 → 3H6 transitions of Tm3+ ions. These bands were also observed in the optical absorption spectrum for the crystals. Twelve-absorption bands showed a difference from the emission bands in positions. The emission and absorption bands related to Tm3+ ions were discussed on the basis of crystal-field theory. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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