title: Luminescence study of nanosized Al2O3:Tb3+obtained by gas-dispersed synthesis.
abstract: Terbium-doped Al2O3samples were obtained by gas-dispersed synthesis. It was shown that the resulting powders, with particle sizes of 10-70 nm, consist of a mixture of transition aluminas, among which the δ*-polymorph is dominant. The luminescence properties of Al2O3:Tb3+have been studied upon excitation in the UV-visible range of the spectrum. It was found that Tb3+ions cause several groups of inhomogeneously broadened emission bands in the range of 470-640 nm, which are characteristic for disordered materials. In addition, the emission spectra contain a broad band at about 450 nm and several narrower ones in the 680-720 nm region. These features are attributed to surface defects and impurity Cr3+ions occupying Al3+octahedral positions, respectively.
authors.affiliation: A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, Lustdorfskaya doroga 86, 65080 Odessa, Ukraine.
authors.forename: I V
authors.initials: IV
authors.lastname: Berezovskaya
authors.forename: N I
authors.initials: NI
authors.lastname: Poletaev
authors.forename: M E
authors.initials: ME
authors.lastname: Khlebnikova
authors.forename: I V
authors.initials: IV
authors.lastname: Zatovsky
authors.forename: K L
authors.initials: KL
authors.lastname: Bychkov
authors.forename: N P
authors.initials: NP
authors.lastname: Efryushina
authors.forename: O V
authors.initials: OV
authors.lastname: Khomenko
authors.forename: V P
authors.initials: VP
authors.lastname: Dotsenko