In:
Photochemical & Photobiological Sciences, Springer Science and Business Media LLC, Vol. 21, No. 2 ( 2022-02), p. 235-245
Abstract:
We present a systematic study on the properties of Na(Y,Gd)F 4 -based upconverting nanoparticles (UCNP) doped with 18% Yb 3+ , 2% Tm 3+ , and the influence of Gd 3+ (10–50 mol% Gd 3+ ). UCNP were synthesized via the solvothermal method and had a range of diameters within 13 and 50 nm. Structural and photophysical changes were monitored for the UCNP samples after a 24-month incubation period in dry phase and further redispersion. Structural characterization was performed by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) as well as dynamic light scattering (DLS), and the upconversion luminescence (UCL) studies were executed at various temperatures (from 4 to 295 K) using time-resolved and steady-state spectroscopy. An increase in the hexagonal lattice phase with the increase of Gd 3+ content was found, although the cubic phase was prevalent in most samples. The Tm 3+ -luminescence intensity as well as the Tm 3+ -luminescence decay times peaked at the Gd 3+ concentration of 30 mol%. Although the general upconverting luminescence properties of the nanoparticles were preserved, the 24-month incubation period lead to irreversible agglomeration of the UCNP and changes in luminescence band ratios and lifetimes.
Type of Medium:
Online Resource
ISSN:
1474-905X
,
1474-9092
DOI:
10.1007/s43630-021-00161-4
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2022
detail.hit.zdb_id:
2072584-X
SSG:
12
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