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Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO
Donglei Wei1,2, Xifeng Yang1, Yushen Liu1
1School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, China.
Inorganic Chemistry
|June 4, 2023
Summary
This study reveals intrinsic and Europium (Eu3+)-activated luminescence in niobium aluminate (NbAlO4) with a wide channel structure. The material exhibits efficient self-activated luminescence and bright red emission when doped with Eu3+, valuable for new luminescent materials.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Luminescence
Background:
- Ordered, interconnected channel structures are crucial for multifunctional materials.
- Niobate oxides are widely studied for their electronic and optical properties.
- Understanding luminescence mechanisms in novel oxide structures is key for technological applications.
Purpose of the Study:
- To investigate the intrinsic and Europium (Eu3+)-activated luminescence in niobium aluminate (NbAlO4) with a wide channel structure.
- To explore the role of the AlO4 tetrahedron and NbO6 chains in luminescence.
- To determine the doping site of Eu3+ ions within the NbAlO4 lattice.
Main Methods:
- Synthesis and characterization of NbAlO4.
- Photoluminescence spectroscopy to study intrinsic and Eu3+-activated emission.
- Site-selective spectroscopy to probe Eu3+ doping mechanisms.
- Band structure analysis (conduction and valence bands).
Main Results:
- NbAlO4 exhibits intrinsic luminescence with efficient self-activation and good thermal stability.
- Eu3+-doped NbAlO4 shows bright red luminescence (5D0 → 7F2 transition at 610 nm).
- Eu3+ ions are incorporated into the structure channels, not cation sites, of NbAlO4.
Conclusions:
- NbAlO4 is a promising n-type semiconductor with efficient intrinsic luminescence due to its unique structure.
- The AlO4 tetrahedron plays a role in blocking energy transfer, enhancing self-activated luminescence.
- Eu3+ doping in NbAlO4 channels leads to bright red emission, offering potential for new luminescent materials.
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