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oai:docta.ucm.es:20.500.14352/588622024-09-06T18:06:11Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Cremades Rodríguez, Ana Isabel author Santos, M. T. author Remon, A. author García, J. A. author Dieguez, E. author Piqueras De Noriega, Francisco Javier author 1996-05-01 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. 0021-8979 10.1063/1.361434 https://hdl.handle.net/20.500.14352/58862 http://dx.doi.org/10.1063/1.361434 http://scitation.aip.org/ Cathodoluminescence and photoluminescence in the core region of Bi_12GeO_20 and Bi_12SiO_20 crystals