title: Crystal structure, electronic structure, and optical and photoluminescence properties of Eu(III) ion-doped Lu6Mo(W)O12.
abstract: Lu(6)WO(12) and Lu(6)MoO(12) doped with Eu(3+) ions have been prepared by using a citrate complexation route, followed by calcination at different temperatures. The morphology, structure, and optical and photoluminescence properties of the compounds were studied as a function of calcination temperature. Both compositions undergo transitions from a cubic to a hexagonal phase when the calcination temperature increases. All the compositions have strong absorption of near-UV light and show intense red luminescence under a near-UV excitation, which is related to the transfer of energy from the host lattices to dopant Eu(3+) ions. Density functional theory calculations have also been performed. The calculation reveals that hexagonal Lu(6)WO(12) and Lu(6)MoO(12) are indirect bandgap materials, and the near-UV excitations are due to the electronic transitions from the O-2p orbitals to W-5d and Mo-4d orbitals, respectively. The lattice parameters and bandgap energies of hexagonal Lu(6)WO(12) and Lu(6)MoO(12) were determined.
authors: Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea.
authors: Huaiyong
authors: H
authors: Li
authors: Hyun Kyoung
authors: HK
authors: Yang
authors: Byung Kee
authors: BK
authors: Moon
authors: Byung Chun
authors: BC
authors: Choi
authors: Jung Hyun
authors: JH
authors: Jeong
authors: Kiwan
authors: K
authors: Jang
authors: Ho Sueb
authors: HS
authors: Lee
authors: Soung Soo
authors: SS
authors: Yi