Journal Article

PUBDB-2020-02819

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Study of the luminescence of $Eu^{2+}$ and $Eu^{3+}$ states in $Ca_3Ga_2Ge_3O_{12}:Eu$ garnet using synchrotron radiation excitation

Zorenko, T. (Corresponding author)Extern* ; Gorbenko, V. ; Witkiewicz, S. ; Zorenko, Y. (Corresponding author)Extern*

2020
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.optmat.2019.109498  doi:10.3204/PUBDB-2020-02819

Abstract: The work is dedicated to the investigation of $Eu^{2+}$ and $Eu^{3+}$ luminescence centers in the $Ca_3Ga_2Ge_3O_{12}$ garnet using synchrotron radiation excitation. The luminescence of $Eu^{2+}$ and $Eu^{3+}$ states was observed in the emission spectra of $Ca_3Ga_2Ge_3O_{12}$:Eu ceramics under excitation with energies in the exciton range and the range above band gap of this garnet. The luminescence of $Eu^{2+}$ ions $Ca_3Ga_2Ge_3O_{12}$ host is observed in the band peaked at 450–460 nm with decay time in the ten ns range and excited in the two wide bands peaked at 5.04 and 6.05 eV, related to the allowed 4f-5d transitions of $Eu^{2+}$ ions. The $Eu^{3+}$ luminescence can be excited via the $Eu^{2+}$ luminescence. We have also found the energies of formation of excitons bound with $Eu^{2+}$ and $Eu^{3+}$ ions in Ca3Ga2Ge3O12, being equal to 7.64 and 6.95 eV, respectively, and the onset of interband transitions in this garnet which is equal to 7.83 eV at 8 K. Strong increase of the luminescence intensity of $Eu^{2+}$ and $Eu^{3+}$ centers is observed under excitation above 21 eV due to multiplication of electronic excitation in $Ca_3Ga_2Ge_3O_{12}$ host.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline I (DORIS III)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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