Jump to main content
Jump to site search

Issue 2, 2016
Previous Article Next Article

X-ray excited photoluminescence near the giant resonance in solid-solution Gd1−xTbxOCl nanocrystals and their retention upon solvothermal topotactic transformation to Gd1−xTbxF3

Author affiliations

Abstract

Design rules for X-ray phosphors are much less established as compared to their optically stimulated counterparts owing to the absence of a detailed understanding of sensitization mechanisms, activation pathways and recombination channels upon high-energy excitation. Here, we demonstrate a pronounced modulation of the X-ray excited photoluminescence of Tb3+ centers upon excitation in proximity to the giant resonance of the host Gd3+ ions in solid-solution Gd1−xTbxOCl nanocrystals prepared by a non-hydrolytic cross-coupling method. The strong suppression of X-ray excited optical luminescence at the giant resonance suggests a change in mechanism from multiple exciton generation to single thermal exciton formation and Auger decay processes. The solid-solution Gd1−xTbxOCl nanocrystals are further topotactically transformed with retention of a nine-coordinated cation environment to solid-solution Gd1−xTbxF3 nanocrystals upon solvothermal treatment with XeF2. The metastable hexagonal phase of GdF3 can be stabilized at room temperature through this topotactic approach and is transformed subsequently to the orthorhombic phase. The fluoride nanocrystals indicate an analogous but blue-shifted modulation of the X-ray excited optical luminescence of the Tb3+ centers upon X-ray excitation near the giant resonance of the host Gd3+ ions.

Graphical abstract: X-ray excited photoluminescence near the giant resonance in solid-solution Gd1−xTbxOCl nanocrystals and their retention upon solvothermal topotactic transformation to Gd1−xTbxF3

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Nov 2015, accepted on 01 Dec 2015 and first published on 02 Dec 2015


Article type: Paper
DOI: 10.1039/C5NR07819A
Citation: Nanoscale, 2016,8, 979-986
  •   Request permissions

    X-ray excited photoluminescence near the giant resonance in solid-solution Gd1−xTbxOCl nanocrystals and their retention upon solvothermal topotactic transformation to Gd1−xTbxF3

    G. R. Waetzig, G. A. Horrocks, J. W. Jude, L. Zuin and S. Banerjee, Nanoscale, 2016, 8, 979
    DOI: 10.1039/C5NR07819A

Search articles by author

Spotlight

Advertisements