Laser induced broadband Vis and NIR emission from Yb:YAG nanopowders

•We have found that the different shapes of LIBE spectra were observed.•The LIBE characteristics were independent on concentration of Yb3+ ions.•the generation of broadband emission begins after reaching a “time threshold”.•IVCT model is considered as general for RE doped phosphors. The laser induce...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2021-06, Vol.865, p.158957, Article 158957
Main Authors: Chaika, M., Tomala, R., Strek, W.
Format: Article
Language:English
Subjects:
Broadband
Charge transfer
Emission analysis
Emission spectra
Infrared lasers
Intervalence charge transfer
Laser beams
Lasers
Nanocrystals
Phosphors
Spectral emissivity
Up-conversion
White light emission
YAG lasers
Yb:YAG nanopowders
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•We have found that the different shapes of LIBE spectra were observed.•The LIBE characteristics were independent on concentration of Yb3+ ions.•the generation of broadband emission begins after reaching a “time threshold”.•IVCT model is considered as general for RE doped phosphors. The laser induced broadband emission (LIBE) of (YbxY1−x)3Al5O12 nanocrystals was investigated in vacuum using the focused infrared laser beam. The samples were prepared via Pechini's technique. The different shapes of LIBE spectra were observed. The LIBE characteristics including an order of the process, rise and decay times, were independent on the type of emission spectra and concentration of Yb3+ ions. Intensity of the emission spectra decreased/increased with time after switching off/on the laser excitation, while the shape of the emission spectra remained approximately the same. This is consistent with the colour of the emission, which remains white even after significant decrease in intensity. For the first time, the generation of broadband emission begins after reaching a certain “time threshold” in range 0–10 s, and disappearing afterwards. Beforehand, several possible LIBE mechanisms have been proposed for different materials, however they don’t cover all aspects of this phenomenon. In the present article, the intervalence charge transfer (IVCT) model is considered as general for RE doped phosphors. The features of LIBE have been described within this model.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.158957