Abstract
Al2O3:Ce3+:Mn2+ films deposited by the spray pyrolysis technique show blue and red emissionsunder ultraviolet light excitation. The blue emission is due to the de-excitation ofCe3+ ions from their excited state 5d to the split ground state2F. The usually weak red emission attributed to 3d 3d de-excitation of Mn2+ is enhanced through an efficient energy transfer fromCe3+ toMn2+ ions. The most probable mechanism of energy transfer is found to be electric dipole–quadrupole interaction. The quantumefficiency of this transfer was estimated as being near to 100%, which makes these filmsinteresting phosphors for the design of luminescent layers in flat-panel displays withtwo-colour emission.
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