Control of luminescence and conductivity of delafossite-type CuYO 2 by substitution of rare earth cation (Eu, Tb) and/or Ca cation for Y cation

• Published in: The Journal of physics and chemistry of solids Vol. 66; no. 11; pp. 2134 - 2138
• Main Authors: Tsuboi, Nozomu, Hoshino, Takanobu, Ohara, Hiroshi, Suzuki, Tomonori, Kobayashi, Satoshi, Kato, Keizo, Kaneko, Futao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2005
• Subjects: A. Oxides; D. Electrical conductivity; D. Luminescence; A. Oxides; D. Luminescence; D. Electrical conductivity
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2005.09.065

Delafossite-type oxides of CuTb
y
Y
1−
y
O
2, CuEu
y
Y
1−
y
O
2, CuCa
x
Tb
y
Y
1−
x−
y
O
2 and CuCa
x
Eu
y
Y
1−
x−
y
O
2 have been prepared by solid state reactions. The lattice-parameter dependence on the composition implies substitution of the Tb
3+, Eu
3+ and Ca
2+ cations for the Y
3+ site. Noticeable sharp emission lines due to the f–f transitions (
5D
4→
7F
J
,
J=3–6) of Tb
3+ or due to the f–f transitions (
5D
0→
7F
J
,
J=0–4) of Eu
3+ are observed at room temperature. Electrical conductivities of CuCa
x
Tb
y
Y
1−
x−
y
O
2 and CuCa
x
Eu
y
Y
1−
x−
y
O
2 are larger than those of CuTb
y
Y
1−
y
O
2 and CuEu
y
Y
1−
y
O
2, indicating the increase of the hole concentration caused by the substitution of Ca
2+ for the Y
3+ site. These results indicate the controllability of the luminescence and conductivity in CuCa
x
Tb
y
Y
1−
x−
y
O
2 and CuCa
x
Eu
y
Y
1−
x−
y
O
2 delafossite-type oxides by simultaneous substitution of the rare earth Tb
3+ or Eu
3+ cation and the Ca
2+ cation for the Y
3+ site.