Díaz-Guerra Viejo, CarlosPiqueras De Noriega, Francisco JavierOpagiste, C.2023-06-202023-06-201996-03-010921-453410.1016/0921-4534(96)00055-Xhttps://hdl.handle.net/20.500.14352/59237© 1996 Elsevier Science B.V. CDG acknowledges MEC for a FPI research grant. This work has been supported by DGICYT (Project PB93-1256).Luminescence properties of Tl_2Ba_2CuO_(6+ δ) samples with different superconducting transition temperatures have been studied by cathodoluminescence (CL) in the scanning electron microscope. Independent of the crystal structure, tetragonal or orthorhombic, the Cl spectra show two resolved bands at about 430 nm (2.9 eV) and 540 nm (2.3 eV), respectively. The results show that the 2.3 eV emission is related to oxygen content and is more intense in low-oxygen content superconducting samples. It is proposed that this band is related to a complex center involving oxygen vacancies. A comparison of spectra from Tl_2Ba_2CuO_(6+ δ) and from precursors used in the synthesis (CuO_x, Tl_2Ba_2O_5) has been carried out.engjournal articlehttp://dx.doi.org/10.1016/0921-4534(96)00055-Xhttp://www.sciencedirect.comhttps://hal.archives-ouvertes.frrestricted access538.9Scanning Electron-MicroscopeHigh-Tc SuperconductorsCu-OYBa_2Cu_3O_(7-X)LuminescencePhaseFilmsTl_2Ba_2Cu_1O_6Física de materiales