Luminescent properties of delafossite-type oxides LaCuO2 and YCuO2

Structural, optical and electrical properties of Mg-doped CuCrO2 thin films by sol–gel processing

“…All the films show a green luminescent emission peak at the 530 nm and blue luminescent emission peaks at the 485 nm, 445 nm, 435 nm and 424 nm. The excitation wavelength is 237 nm corresponding to 5.23 eV energy and the luminescence emission peaks occur at 2.92 eV, 2.85 eV, 2.78 eV, 2.56 eV and 2.34 eV energies, respectively.The band edge emissions can be ascribed to the 3d 9 4s 1 and 3d 10 intraband transitions involving Cu + ions as also reported earlier in the CuYO 2[34] and CuLaO 2[35] delafossite oxide insulators. The intensity of the peak at 485 nm increased and the FWHM decreased as Mg content increased.…”

Room temperature ozone sensing properties of p-type CuCrO2 nanocrystals

“…Delafossite-type oxide ABO 2 is a p-type semiconductor oxide with interesting physical and chemical properties that make it suitable for various technological applications such as catalyst [7,8], luminescent materials [9], batteries [10], and transparent p-type conducting oxides [11,12]. Recently, delafossite-type oxide CuAlO 2 has been applied for room temperature ozone sensor [13], unfortunately, the response features of CuAlO 2 ozone sensor are very poor, since CuCrO 2 with delafossite structure as the transparent p-type conducting also show better conductivity in the delafossite oxide group of ABO 2 (A = Cu or Ag, B = Al, Cr, Sc, Y, etc.…”

The luminescent properties of CuAlO2

“…As mentioned earlier, previous optical studies of the Delafossite compounds CuLaO 2 and CuYO 2 have also detected a second emission band which was assigned to d(3d z 2 À 4s) / 3d 9 4p 1 transition with a larger Stokes shi. 30 The second band in CuLaO 2 and CuYO 2 , despite appearing at longer wavelengths in PL, actually corresponds to a higher energy transition to the 4p x p y orbital with a large Stokes shi resulting in an emission band below that of the near band-edge emission. Some qualitative similarities exist between the blue emission seen in CuAlO 2 and the low energy bands seen in CuLaO 2 and CuYO 2 in that (i) it is readily quenched by heating and (ii) its position is at energies below the fundamental excitonic transition.…”