Cremades Rodríguez, Ana IsabelSantos, M. T.Remon, A.García, J. A.Dieguez, E.Piqueras De Noriega, Francisco Javier2023-06-202023-06-201996-05-010021-897910.1063/1.361434https://hdl.handle.net/20.500.14352/60109©1996 American Institute of Physics This work has been supported by CICYT (Project No. ESP95-0148) and DGICYT (Project No. PB93-1256).Cathodoluminescence and photoluminescence of Bi_(12)Si_(O)20 and Bi_(12)GeO_(20) samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm band is the predominant feature in the core emission. The evolution of this band during electron irradiation suggests possible emission mechanisms. In addition, two infrared emissions at about 915 and 1390 nm are detected.engjournal articlehttp://dx.doi.org/10.1063/1.361434http://aip.scitation.orgopen access538.9LuminescenceBi_4Ge_3O_12Física de materiales