Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

Vasilii Khanin; Ivan Venevtsev; Kirill Chernenko; Vladimir Pankratov; Konstantin Klementiev; Thomas van Swieten; Arnoldus J. van Bunningen; Ivan Vrubel; Roman Shendrik; Cees Ronda; Piotr Rodnyi; Andries Meijerink

doi:10.1016/j.jlumin.2021.118150

Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

Vasilii Khanin
, Ivan Venevtsev
, Kirill Chernenko
, Vladimir Pankratov
, Konstantin Klementiev
, Thomas van Swieten
, Arnoldus J. van Bunningen
, Ivan Vrubel
, Roman Shendrik
, Cees Ronda
, Piotr Rodnyi
, Andries Meijerink

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex LuGd2Ga3Al2O12:Ce3+/Ce4+ ceramics by means of VUV synchrotron irradiation. At first we have established via transmission spectroscopy and X-ray absorption spectroscopy that LuGd2Ga3Al2O12:Ce, Mg sample contains cerium in the 4+ state only. Then we show with VUV spectroscopy efficient interaction of excitons with Gd3+ and Ce3+, and lack of exciton absorption edge in LuGd2Ga3Al2O12:Ce4+ excitation spectrum. Instead, Ce4+ exhibits charge-transfer absorption band in the range of exciton emission. We suggest that when Ce4+ concentration becomes too high, the exciton → Gd3+ → Ce3+ energy transfer path is hindered. It leads to high intensity of Gd3+ luminescence in Lu1Gd2Ga3Al2O12:Ce, Mg ceramics, but lowered Ce3+ X-ray excited luminescence. Fine balance between 3+ and 4+ Ce concentrations is necessary to achieve the best performance of garnet scintillators.

Original language	English
Article number	118150
Pages (from-to)	1-6
Journal	Journal of Luminescence
Volume	237
DOIs	https://doi.org/10.1016/j.jlumin.2021.118150
Publication status	Published - Sept 2021

Keywords

Ce4+
Energy transfer
Excitons
Garnet scintillators
Synchrotron
XANES

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1-s2.0-S0022231321002660-mainFinal published version, 2.32 MBLicence: CC BY

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title = "Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics",

abstract = "Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex LuGd2Ga3Al2O12:Ce3+/Ce4+ ceramics by means of VUV synchrotron irradiation. At first we have established via transmission spectroscopy and X-ray absorption spectroscopy that LuGd2Ga3Al2O12:Ce, Mg sample contains cerium in the 4+ state only. Then we show with VUV spectroscopy efficient interaction of excitons with Gd3+ and Ce3+, and lack of exciton absorption edge in LuGd2Ga3Al2O12:Ce4+ excitation spectrum. Instead, Ce4+ exhibits charge-transfer absorption band in the range of exciton emission. We suggest that when Ce4+ concentration becomes too high, the exciton → Gd3+ → Ce3+ energy transfer path is hindered. It leads to high intensity of Gd3+ luminescence in Lu1Gd2Ga3Al2O12:Ce, Mg ceramics, but lowered Ce3+ X-ray excited luminescence. Fine balance between 3+ and 4+ Ce concentrations is necessary to achieve the best performance of garnet scintillators.",

keywords = "Ce4+, Energy transfer, Excitons, Garnet scintillators, Synchrotron, XANES",

author = "Vasilii Khanin and Ivan Venevtsev and Kirill Chernenko and Vladimir Pankratov and Konstantin Klementiev and \{van Swieten\}, Thomas and \{van Bunningen\}, \{Arnoldus J.\} and Ivan Vrubel and Roman Shendrik and Cees Ronda and Piotr Rodnyi and Andries Meijerink",

year = "2021",

month = sep,

doi = "10.1016/j.jlumin.2021.118150",

language = "English",

volume = "237",

pages = "1--6",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

AU - Khanin, Vasilii

AU - Venevtsev, Ivan

AU - Chernenko, Kirill

AU - Pankratov, Vladimir

AU - Klementiev, Konstantin

AU - van Swieten, Thomas

AU - van Bunningen, Arnoldus J.

AU - Vrubel, Ivan

AU - Shendrik, Roman

AU - Ronda, Cees

AU - Rodnyi, Piotr

AU - Meijerink, Andries

PY - 2021/9

Y1 - 2021/9

N2 - Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex LuGd2Ga3Al2O12:Ce3+/Ce4+ ceramics by means of VUV synchrotron irradiation. At first we have established via transmission spectroscopy and X-ray absorption spectroscopy that LuGd2Ga3Al2O12:Ce, Mg sample contains cerium in the 4+ state only. Then we show with VUV spectroscopy efficient interaction of excitons with Gd3+ and Ce3+, and lack of exciton absorption edge in LuGd2Ga3Al2O12:Ce4+ excitation spectrum. Instead, Ce4+ exhibits charge-transfer absorption band in the range of exciton emission. We suggest that when Ce4+ concentration becomes too high, the exciton → Gd3+ → Ce3+ energy transfer path is hindered. It leads to high intensity of Gd3+ luminescence in Lu1Gd2Ga3Al2O12:Ce, Mg ceramics, but lowered Ce3+ X-ray excited luminescence. Fine balance between 3+ and 4+ Ce concentrations is necessary to achieve the best performance of garnet scintillators.

AB - Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex LuGd2Ga3Al2O12:Ce3+/Ce4+ ceramics by means of VUV synchrotron irradiation. At first we have established via transmission spectroscopy and X-ray absorption spectroscopy that LuGd2Ga3Al2O12:Ce, Mg sample contains cerium in the 4+ state only. Then we show with VUV spectroscopy efficient interaction of excitons with Gd3+ and Ce3+, and lack of exciton absorption edge in LuGd2Ga3Al2O12:Ce4+ excitation spectrum. Instead, Ce4+ exhibits charge-transfer absorption band in the range of exciton emission. We suggest that when Ce4+ concentration becomes too high, the exciton → Gd3+ → Ce3+ energy transfer path is hindered. It leads to high intensity of Gd3+ luminescence in Lu1Gd2Ga3Al2O12:Ce, Mg ceramics, but lowered Ce3+ X-ray excited luminescence. Fine balance between 3+ and 4+ Ce concentrations is necessary to achieve the best performance of garnet scintillators.

KW - Ce4+

KW - Energy transfer

KW - Excitons

KW - Garnet scintillators

KW - Synchrotron

KW - XANES

UR - https://www.mendeley.com/catalogue/02f3aab0-be2a-382c-ab0f-a08592a0268d/

U2 - 10.1016/j.jlumin.2021.118150

DO - 10.1016/j.jlumin.2021.118150

M3 - Article

SN - 0022-2313

VL - 237

SP - 1

EP - 6

JO - Journal of Luminescence

JF - Journal of Luminescence

M1 - 118150

ER -

Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

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Keywords

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