The direct identification of quantum cutting in Tm3+ ions and energy transfer in the Tm3+/Yb3+ system based on a Ba2Gd2Si4O13 oxide host

Quantum cutting (QC) is an important physical process, the occurrence of which still needs further verification in different luminescent ions. In this work, a series of Tm3+/Yb3+ doped Ba2Gd2Si4O13 (BGS) phosphors were prepared by a solid-state reaction method. The phase purity, crystal structure, m...

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Bibliographic Details
Published in:Inorganic chemistry frontiers 2022-01, Vol.9 (4), p.719-728
Main Authors: Zhang, Jia, Pei, Yuqing, Ma, Chunlin, Zhang, Yining
Format: Article
Language:English
Subjects:
Cross relaxation
Crystal structure
Cutting
Emission spectra
Energy transfer
Excitation
Inorganic chemistry
Luminescence
Optical properties
Phosphors
Quantum efficiency
Thulium
Ytterbium
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Summary:Quantum cutting (QC) is an important physical process, the occurrence of which still needs further verification in different luminescent ions. In this work, a series of Tm3+/Yb3+ doped Ba2Gd2Si4O13 (BGS) phosphors were prepared by a solid-state reaction method. The phase purity, crystal structure, morphology, luminescence properties and QC characteristics were studied. In the BGS:Tm3+ samples, the QC phenomenon was directly observed and verified upon 355 and 472 nm excitation. The cross-relaxation processes and QC models were analyzed, and then proposed according to the spectral features. A method for the calculation of extra quantum efficiency was developed on the basis of the emission spectra. In the Tm3+–Yb3+ codoped BGS phosphors, the energy transfer (ET) from different excited states of Tm3+ to Yb3+ takes place via different ways. The contributions of different excited levels of Tm3+ to Yb3+ luminescence were evaluated by a defined relative ET efficiency ratio (Rη), which revealed that the contribution of the 1D2 level is much larger than those of other excited states of Tm3+.
ISSN:2052-1545
2052-1553
DOI:10.1039/d1qi01327k