RT Journal Article T1 Cathodoluminescence and photoluminescence in the core region of Bi_12GeO_20 and Bi_12SiO_20 crystals A1 Cremades Rodríguez, Ana Isabel A1 Santos, M. T. A1 Remon, A. A1 García, J. A. A1 Dieguez, E. A1 Piqueras De Noriega, Francisco Javier AB Cathodoluminescence and photoluminescence of Bi_12SiO_20 and Bi_12GeO_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. PB American Institute of Physics SN 0021-8979 YR 1996 FD 1996-05-01 LK https://hdl.handle.net/20.500.14352/58862 UL https://hdl.handle.net/20.500.14352/58862 LA eng NO © 1996 American Institute of Physics.This work has been supported by CICYT (Project No. ESP95-0148) and DGICYT (Project No. PB93-1256). NO CICYT NO DGICYT DS Docta Complutense RD 9 abr 2025