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Interplay between electronic and structural effects on the photoluminescence decay mechanisms in LaPO4·nH2O:Tb3+ and LaPO4:Tb3+ single-crystal nanorods

DOI: 10.1039/C8TC03187H DOI Help

Authors: M. T. Colomer (Instituto de Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas (CSIC)y Vidrio) , S. Diaz-Moreno (Diamond Light Source) , A. Tamayo (Instituto de Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas (CSIC)y Vidrio) , A. L. Ortiz (Universidad de Extremadura) , J. Chaboy (Diamond Light Source; Universidad de Zaragoza)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry C

State: Published (Approved)
Published: October 2018
Diamond Proposal Number(s): 15968

Abstract: A novel High Energy Resolution Fluorescence Detected X-ray Absorption Spectroscopy (HERFD-XAS) study at the Tb L3-edge for the rhabdophane-type LaPO4·nH2O:Tb3+ and the monazite-type LaTbPO4:Tb3+ nanorods is reported. We have observed that the changes in the white-line intensity follow a similar trend to that previously observed in the photoluminescence behaviour of these materials. Those changes have been assigned to the localization of the terbium 5d states and the modification induced by the hybridization with the next neighbours as the terbium content is varied. The interplay between electronic (d-states localization) and structural (local disorder) effects is used to explain the different optical behaviour between the two series of nanorods. XAS results indicate that the local ordering is a key factor influencing the different emission efficiency, quenching effect and decay lifetimes observed experimentally for both series of nanorods. The present results indicate that the long lifetime decay process is accounted within a standard single Tb3+ ion scenario, where the structural disorder, favoured by the presence of water molecules in the structure, aids the non-radiative recombination processes. Implications for future use of the white-line intensity in the HERFD-XAS spectra in characterizing other luminescent materials are also discussed.

Journal Keywords: rare-earth phosphates; Photoluminiscence; Nanorods; X-ray Absorption Spectroscopy; local structure

Subject Areas: Materials, Chemistry

Instruments: I20-Scanning-X-ray spectroscopy (XAS/XES)

Added On: 29/10/2018 10:51

Discipline Tags:

Physical Chemistry Chemistry Materials Science

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) High Energy Resolution Fluorescence Detected XAS (HERFD-XAS)