Abstract
Porous anodic Al2O3 films 50μm in thickness formed in oxalic acid solution were detached cathodically from aluminum substrate. The films were then dipped in an aqueous solution of 2.92 wt. % Tb (NO3)3, and heat-teated at 550°C for 10 minutes in air. The light-emitting device was fabricated by sandwiching the Al2O3 film between sheets of 110 glass. At voltage of 280V AC 50Hz or above, a bright green light emission was obseorved, with peaks at 489, 542, 583, 620nm.
This emission is not intrinsic electroluminescence but is due to the air-plasma collision excitation of the Al2O3: Tb3+ phosphor that is formed on the pore walls of the film by the heat-treatment.
