Issue 35, 2023

Influence of heavy magnesium codoping on emission decay in Ce-doped multicomponent garnet scintillators

Abstract

This study is aimed at the acceleration of luminescence decay in Ce-doped garnet-type scintillators by heavy aliovalent codoping. Time-resolved photoluminescence spectroscopy over a wide temperature range of LuGAGG:Ce epitaxial layers with up to 6000 ppm of codoping magnesium, and a transient absorption technique probing the population of the emitting Ce centers and energies of optical transitions at Ce3+ ions in the layers, enabled the interpretation of luminescence decay. Heavy Mg-codoping facilitated the luminescence decay acceleration due to the coexistence of two types of emission centers: regular ions of Ce3+; and Ce ions with magnesium in the immediate vicinity, i.e., Ce3+ + Mg2+ centers. In the latter centers, the activation energy for thermal quenching is 0.2 eV, instead of 0.48 eV in regular Ce3+ centers; and a new channel of temperature-independent nonradiative recombination occurs, pushing the low-temperature luminescence decay time from 50 ns – due to radiative recombination at regular Ce3+ centers – down to 10.5 ns. The magnesium content does not change the properties of the emission centers but increases the contribution of the Mg-related centers. Time-resolved cathodoluminescence spectroscopy of the layers evidences a broad applicability of the suggested model for heavy aliovalently codoped Ce-doped garnets beyond the LuGAGG:Ce thin films prospective for X-ray imaging.

Graphical abstract: Influence of heavy magnesium codoping on emission decay in Ce-doped multicomponent garnet scintillators

Article information

Article type
Paper
Submitted
27 Jun 2023
Accepted
01 Aug 2023
First published
01 Aug 2023
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2023,11, 12007-12015

Influence of heavy magnesium codoping on emission decay in Ce-doped multicomponent garnet scintillators

S. Nargelas, A. Solovjovas, Y. Talochka, Ž. Podlipskas, M. Kucera, Z. Lucenicova and G. Tamulaitis, J. Mater. Chem. C, 2023, 11, 12007 DOI: 10.1039/D3TC02247A

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