Luminescence enhancement in Eu[sup 3+]-doped α- and γ-Al[sub 2]O[sub 3] produced by pressure-assisted low-temperature combustion synthesis

Ozuna, O.; Hirata, G.A.; McKittrick, J.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1296
Academic Journal
Intense red luminescence in Eu[sup 3+]-doped gamma (γ) and alpha (α) alumina (Al[sub 2]O[sub 3]) phosphors obtained by direct and indirect combustion synthesis at low-temperatures is reported. γ and α-(Al[sub 1-x]Eu[sub x])[sub 2]O[sub 3] are easily produced by combustion synthesis at 280 °C in the range of x=0.001–0.06 at. %. The well-defined direct synthesis allows europium ions to incorporate into the α or γ alumina lattice in spite of the large size difference between these ions and the aluminum cations in Al[sub 2]O[sub 3]. These materials yield a strong fluorescence at room temperature due to f–f transition lines within Eu[sup 3+] (4f[sup 6]) electron emission configuration. Furthermore, from luminescence measurements, it is deduced that Eu[sup 3+] occupy low-symmetry sites in the Al[sub 2]O[sub 3] lattice. © 2004 American Institute of Physics.


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