Luminescence Properties of Delafossite-Type CuYO 2 Doped with Calcium, Oxygen or Rare Earth Tb

• Published in: Japanese Journal of Applied Physics Vol. 44; no. 1S; p. 765
• Main Authors: Tsuboi, Nozomu, Ohara, Hiroshi, Hoshino, Takanobu, Kobayashi, Satoshi, Kato, Keizo, Kaneko, Futao
• Format: Journal Article
• Language: English
• Published: 01-01-2005
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/JJAP.44.765

Delafossite-type CuYO
2
and CuY
1-
x
Ca
x
O
2
(
x
≤0.05) samples exhibited a green-PL-emission band due to the Cu
+
interconfiguration transition from 3d
9
4s
1
to 3d
10
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 CuYO
2
samples exhibited no emissions. The increase in nonradiative relaxation processes in the oxygen-annealed CuYO
2
samples is possibly related to structural changes such as orthorhombic distortion during the oxygen annealing. In the photoluminescence of delafossite-type CuY
1-
y
Tb
y
O
2
(
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 Tb
3+
(
5
D
4
→
7
F
J
,
J
=3–6).