Influence of Ga3+Substitution on the Spectroscopic Properties of Ce3+Doped Tb3(Al,Ga)5O12Garnet Phosphors
Year: 2018
Type: article
Abstract: This work concerns the synthesis and optical characterization of a solid solution series of Ce 3+ doped yellow emitting garnet phosphor Tb 3 (Al 1-x Ga x ) 5 O 12 (TAG), with the goal to investigate the influence of Ga 3+ substitution on the optical properties. X-ray powder diffractograms were recorded to determine the phase purity of the synthesized samples. Photoluminescence properties were examined by recording excitation, emission and diffuse reflectance spectra in an integration sphere. Moreover, temperature dependent emission spectra as well as temperature dependent fluorescent lifetimes were measured to study the thermal quenching behavior and the energy transfer processes between Ce 3+ and Tb 3+ . It was confirmed that the crystal field splitting of the 5d levels of Ce 3+ decreases with increasing Ga 3+ content, resulting in shifted excitation, emission and reflectance spectra. Furthermore, the thermal quenching temperature increases up to a Ga 3+ substitution of 40%. Finally, temperature dependent fluorescent lifetime measurements revealed changes in the energy transfer efficiency from Ce 3+ to Tb 3+ with increasing Ga 3+ substitution related to alteration in the crystal field splitting. Emission spectra recorded at 3 K differ substantially from room temperature spectra for this reason.
DOI: 10.1149/2.0131809jss
Authors: Stefan Fischer, Florian Baur, Thomas Jüstel
Institution: FH Münster University of Applied Sciences
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,950
Funder: Merck KGaA
OpenAlex ID: W2888190820