Abstract
We have activated α Al2O3 with Sm2+, Sm3+, Eu3+, Gd3+, Tb3+, and Dy3+ by mixing powders of the rare-earth oxide with γ Al2O3 and firing in an N2 and then in a Cl2 atmosphere at 800°—1000°C. When these activated powders are placed between a metal base plate and a conducting glass plate and about 500 v dc is applied, electrofluorescence is observed. The emitted spectra are characteristic of the fluorescence of the rare-earth ion in the corundum structure. A mechanism for excitation is discussed.
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