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Abstract
This work concerns the synthesis and optical characterization of a solid solution series of Ce3+ doped yellow emitting garnet phosphor Tb3(Al1-xGax)5O12 (TAG), with the goal to investigate the influence of Ga3+ 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 Ce3+ and Tb3+. It was confirmed that the crystal field splitting of the 5d levels of Ce3+ decreases with increasing Ga3+ content, resulting in shifted excitation, emission and reflectance spectra. Furthermore, the thermal quenching temperature increases up to a Ga3+ substitution of 40%. Finally, temperature dependent fluorescent lifetime measurements revealed changes in the energy transfer efficiency from Ce3+ to Tb3+ with increasing Ga3+ substitution related to alteration in the crystal field splitting. Emission spectra recorded at 3 K differ substantially from room temperature spectra for this reason.
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