P‐type conductive CuYO 2 phosphor Co‐doped with Eu, Tb or Tm rare‐earth cation and Ca acceptor cation

In delafossite‐type oxides of CuR x Y 1– x O 2 (R = Eu, Tb or Tm) and CuR x Ca y Y 1– x – y O 2 prepared through the conventional solid state reactions, the lattice constant dependence on the composition implies doping with the Tb 3+ , Eu 3+ and Tm 3+ cations on the Y 3+ site. Noticeable sharp emission lines due to the f–f transitions of Eu 3+ , Tb 3+ and Tm 3+ are observed at room temperature in CuR x Ca y Y 1– x – y O 2 as well as CuR x Y 1– x O 2 . P‐type conductivity of CuR x Ca y Y 1– x – y O 2 increases with increasing Ca concentration, indicating the increase of hole concentration caused by doping with Ca 2+ acceptor cation on the Y 3+ site. These results indicate the controllability of the luminescence and conductivity in delafossite‐type CuYO 2 oxides by co‐doping with Eu, Tb or Tm rare‐earth cation and Ca acceptor cation on the Y 3+ sites. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)