Luminescence Properties of Delafossite-Type CuYO2 Doped with Calcium, Oxygen or Rare Earth Tb

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概要

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• Delafossite-type CuYO2 and CuY1-xCaxO2 ($x\leq 0.05$) samples exhibited a green-PL-emission band due to the Cu+ interconfiguration transition from 3d94s1 to 3d10 at room temperature. With increasing Ca concentration, the Cu+ emission shifted slightly to the shorter-wavelength side with a slightly weaker emission intensity. This slight change in Cu+ emission property is considered to be caused by the increase in hole concentration within the Cu+ layer arising from the increase in Ca concentration. On the other hand, oxygen-annealed CuYO2 samples exhibited no emissions. The increase in nonradiative relaxation processes in the oxygen-annealed CuYO2 samples is possibly related to structural changes such as orthorhombic distortion during the oxygen annealing. In the photoluminescence of delafossite-type CuY1-yTbyO2 ($y=0.05$) at room temperature, no Cu+ emission band was observed, but sharp emission lines were observed. All the emission lines were assigned to the f-f transitions of Tb3+ (5D4$\rightarrow$7FJ, $J=3--6$).

• 2005-01-15

著者

• Tsuboi Nozomu

  Faculty Of Engineering Niigata University

• Kaneko Futao

  Faculty Of Engineering Niigata University

• OHARA Hiroshi

  Graduated School of Science and Technology, Niigata University

• KATO Keizo

  Faculty of Engineering, Niigata University

• Kobayashi Satoshi

  Faculty Of Engineering Niigata University

• Hoshino Takanobu

  Graduated School Of Science And Technology Niigata University

• Kaneko Futao

  Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

• Kato Keizo

  Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

• Tsuboi Nozomu

  Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

• Hoshino Takanobu

  Graduated School of Science and Technology, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

• Kobayashi Satoshi

  Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

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