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Title: | Blue and red photoluminescence from Al2O3 : Ce3+: Mn2+ films deposited by spray pyrolysis |
Authors: | Martínez-Martínez, R Ramos-Brito, F Caldino, U Falcony, C García-Hipolito, M Hernández-Pozos, JL |
Issue Date: | 2005 |
Abstract: | Al2O3:Ce3+:Mn2+ films deposited by the spray pyrolysis technique show blue and red emissions under ultraviolet light excitation. The blue emission is due to the de-excitation of Ce3+ ions from their excited state 5d to the split ground state F-2. The usually weak red emission attributed to 3d -> 3d de-excitation of Mn2+ is enhanced through an efficient energy transfer from Ce3+ to Mn2+ ions. The most probable mechanism of Ce3+ -> Mn2+ energy transfer is found to be electric dipole-quadrupole interaction. The quantum efficiency of this transfer was estimated as being near to 100%, which makes these films interesting phosphors for the design of luminescent layers in flat-panel displays with two-colour emission. |
URI: | http://hdl.handle.net/11154/1433 |
ISSN: | 0953-8984 |
Appears in Collections: | Ciencias
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