1. A trimeric tri-Tb3+ including antimonotungstate and its Eu3+/Tb3+/Dy3+/Gd3+-codoped species with luminescence properties.
- Author
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Xu, Xin, Lu, Changtong, Xie, Saisai, Chen, Lijuan, and Zhao, Junwei
- Subjects
TERBIUM ,LUMINESCENCE ,ION energy ,DIPOLE-dipole interactions ,ENERGY transfer - Abstract
A trimeric tri-Tb
3+ -including antimonotungstate (AMT) hybrid Na17 {(WO4 )[Tb(H2 O)(Ac)(B-α-SbW9 O31 (OH)2 )]3 }·50H2 O (Tb3 W28 ) was successfully synthesized, in which the capped tetrahedral {WO4 } group plays a significant template role in directing the aggregation of three [B-α-SbW9 O33 ]9− fragments and three Tb3+ ions. Eu3+ /Tb3+ /Dy3+ /Gd3+ -codoped AMT materials based on Tb3 W28 were firstly prepared and their luminescence properties were investigated. The red emitter Eu3+ , yellow emitter Dy3+ , and nonluminous Gd3+ ions were codoped into Tb3 W28 to substitute Tb3+ ions for investigating the energy transfer (ET) mechanism among Eu3+ , Tb3+ , and Dy3+ ions. Upon the6 H15/2 →4 I13/2 excitation at 389 nm of the Dy3+ ion, the ET1 mechanism (Dy3+ → Tb3+ ) was confirmed as a non-radiative dipole–dipole interaction. Under the7 F6 →5 L10 excitation at 370 nm of the Tb3+ ion, the ET2 mechanism (Tb3+ → Eu3+ ) was identified as a non-radiative quadrupole–quadrupole interaction. Under excitation at 389 nm, the two-step successive Dy3+ → Tb3+ → Eu3+ ET3 process was proved in Dy1.2 Tb3z Eu0.03 Gd1.77−3z W28 . Through changing the excitation wavelengths, the emission color of Dy1.2 Tb1.2 Eu0.03 Gd0.57 W28 can vary from blue to yellow, in which a near-white-light emission case was observed upon excitation at 378 nm. This work not only provides a systematic ET mechanism study of hetero-Ln-codoped AMTs, but also offers some useful guidance for designing novel performance-oriented Ln-codoped polyoxometalate-based materials. [ABSTRACT FROM AUTHOR]- Published
- 2020
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