title: Significant enhancement of yellow-green light emission of TiO2 thin films using Au localized surface plasmons: effect of dielectric MgO spacer layer thickness.
abstract: TiO2/MgO/Au composite thin films with different MgO spacer layer thicknesses (0-41 nm) were fabricated on c-sapphire substrates by sputtering and pulsed laser deposition. Through optimizing the thickness of MgO spacer layer, which can effectively prevent nonradiative Förster resonant energy transfer and charge transfer between Au and TiO2, defect-related yellow-green light emission of TiO2 thin film was greatly enhanced - 12 times. The enhancement mechanism is attributed to the efficient increase of luminescence efficiency of deep levels in TiO2 induced by resonant coupling between localized surface plasmons in Au nanoparticles and electron-hole pairs in defect-related levels of TiO2.
authors.forename: Cen
authors.initials: C
authors.lastname: Zhang
authors.forename: Weizhen
authors.initials: W
authors.lastname: Liu
authors.forename: Haiyang
authors.initials: H
authors.lastname: Xu
authors.forename: Jiangang
authors.initials: J
authors.lastname: Ma
authors.forename: Yichun
authors.initials: Y
authors.lastname: Liu