skip to main content

Title: The role of Nb in intensity increase of Er ion upconversion luminescence in zirconia

It is found that Nb co-doping increases the luminescence and upconversion luminescence intensity in rare earth doped zirconia. Er and Yb-doped nanocrystalline samples with or without Nb co-doping were prepared by sol-gel method and thermally annealed to check for the impact of phase transition on luminescence properties. Phase composition and grain sizes were examined by X-ray diffraction; the morphology was checked by scanning- and high-resolution transmission electron microscopes. Both steady-state and time-resolved luminescence were studied. Comparison of samples with different oxygen vacancy concentrations and different Nb concentrations confirmed the known assumption that oxygen vacancies are the main agents for tetragonal or cubic phase stabilization. The oxygen vacancies quench the upconversion luminescence; however, they also prevent agglomeration of rare-earth ions and/or displacement of rare-earth ions to grain surfaces. It is found that co-doping with Nb ions significantly (>20 times) increases upconversion luminescence intensity. Hence, ZrO{sub 2}:Er:Yb:Nb nanocrystals may show promise for upconversion applications.
Authors:
; ; ;  [1] ;  [2]
  1. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., Riga LV1063 (Latvia)
  2. Institute of Inorganic Chemistry, Riga Technical University, Salaspils-1 LV2169 (Latvia)
Publication Date:
OSTI Identifier:
22304200
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CRYSTALS; DOPED MATERIALS; ERBIUM IONS; LUMINESCENCE; NANOSTRUCTURES; NIOBIUM ADDITIONS; PHASE TRANSFORMATIONS; STABILIZATION; STEADY-STATE CONDITIONS; SURFACES; TIME RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; YTTERBIUM ADDITIONS; ZIRCONIUM OXIDES