Controlled Synthesis of Tb3+/Eu3+ Co-Doped Gd₂O₃ Phosphors with Enhanced Red Emission.

Dong Zhu,Zongming Liu,Hao Wu,Xiangyang Guo,Qinggang Li,Lei Meng,Jinkai Li

doi:10.3390/molecules24040759

Dong Zhu, Zongming Liu + Show 5 more

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https://doi.org/10.3390/molecules24040759

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Abstract

(Gd0.93−xTb0.07Eux)2O3 (x = 0–0.10) phosphors shows great potential for applications in the lighting and display areas. (Gd0.93−xTb0.07Eux)2O3 phosphors with controlled morphology were prepared by a hydrothermal method, followed by calcination at 1100 °C. XRD, FE-SEM, PL/PLE, luminescent decay analysis and thermal stability have been performed to investigate the Eu3+ content and the effects of hydrothermal conditions on the phase variation, microstructure, luminescent properties and energy transfer. Optimum excitation wavelength at ~308 nm nanometer ascribed to the 4f8-4f75d1 transition of Tb3+, the (Gd0.93−xTb0.07Eux)2O3 phosphors display both Tb3+and Eu3+ emission with the strongest emission band at ~611 nm. For increasing Eu3+ content, the Eu3+ emission intensity increased as well while the Tb3+ emission intensity decreased owing to Tb3+→Eu3+ energy transfer. The energy transfer efficiencies were calculated and the energy transfer mechanism was discussed in detail. The lifetime for both the Eu3+ and Tb3+ emission decreases with the Eu3+ addition, the former is due to the formation of resonant energy transfer net, and the latter is because of contribution by Tb3+→Eu3+ energy transfer. The phosphor morphology can be controlled by adjusting the hydrothermal condition (reaction pH), and the morphological influence to the luminescent properties (PL/PLE, decay lifetime, etc.) has been studied in detail.

Highlights

The stable physical and chemical properties of Gd2 O3 with cubic structure make it an important inorganic compound in luminescence applications
The (Gd0.93−x Tb0.07 Eux )2 O3 system was chosen in light of: (1) the luminescent properties of phosphor are greatly affected by the particle morphology and size, which relied on the synthesis route used. [5,6,7]
The hydrothermal method is usually selected to control the particle morphology and size [8,9,10], which is applied in the preparation of Gd0.93−x Tb0.07 Eux O3 systems in this work

Summary

Introduction

The stable physical and chemical properties of Gd2 O3 with cubic structure make it an important inorganic compound in luminescence applications. The (Gd0.93−x Tb0.07 Eux ) O3 system was chosen in light of: (1) the luminescent properties of phosphor are greatly affected by the particle morphology and size, which relied on the synthesis route used. Luminescent properties due to particle morphology and size were studied in detail;. Of Gd compared to Y3+ (1.22) and Lu3+ (1.27) may result in easier interconfigurational transition, which can induce configurational transition, which can induce new new properties properties and and further further improve improve the thered redemission emission intensity. The phase structure, microstructure, luminescent properties, energy transfer efficiency values. The phase structure, microstructure, luminescent properties, energy transfer efficiency and and mechanism were analyzed combinationofofXRD, XRD,FE-SEM, FE-SEM, PLE/PL. Morphology and size effect of the particle on the luminescent analysis.

Results and Discussion

FE-SEM

F transition

Summary

Procedures