Influence of TiO2 host crystallinity on Er3+ light emission

abstract

This work presents a study of the luminescence properties of Er3+ when included into two different TiO2 hosts: a polycrystalline and an amorphous host. The two host environments were produced by depositing two thin films with different Er3+ concentration using radio-frequency magnetron sputtering. Structural analysis revealed the presence of the rutile and anatase phases in the polycrystalline film. Time-resolved and steady-state photoluminescence measurements evidenced the presence of two distinct local Er3+ environments in the polycrystalline host. For the amorphous TiO2 host, only one Er3+ environment was observed, which differed from the two environments in the polycrystalline host. A method for extracting a fast and slow time-resolved emission spectrum from the two observed local environments in the polycrystalline host is also presented. (C) 2016 Optical Society of America

keywords

TITANIA THIN-FILMS; UP-CONVERSION; DOPED TIO2; LUMINESCENCE; NANOCRYSTALS; AMPLIFIERS; EUROPIUM; CELLS

subject category

Materials Science; Optics

authors

Johannsen, SR; Roesgaard, S; Julsgaard, B; Ferreira, RAS; Chevallier, J; Balling, P; Ram, SK; Larsen, AN

our authors

acknowledgements

This work was supported by the Danish Strategic Research Council under the project named

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