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Exploitation of Eu
T S Sreena1, P Prabhakar Rao, Athira K V Raj
1Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum - 695 019, India. padala_rao@yahoo.com.
Physical Chemistry Chemical Physics : PCCP
|September 14, 2018
Summary
Europium-doped stannate pyrochlores show tunable red luminescence. Structural disorder, controlled by lanthanide ion size, impacts luminescence, with ordered structures enhancing brightness for potential lighting applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Luminescence
Background:
- Europium (Eu3+) ions serve as effective structural probes due to their distinct energy levels.
- Stannate pyrochlores are investigated for their potential as luminescent materials.
Purpose of the Study:
- To synthesize Eu3+ doped stannate pyrochlores (Ln2.85YSnNbO10.5:0.15Eu3+) and explore how structural transitions influence luminescence.
- To understand the relationship between cation ordering and red emission properties.
Main Methods:
- High-temperature solid-state reaction method for phosphor synthesis.
- X-ray diffraction (XRD) and Raman spectroscopy to analyze structural evolution and disorder.
- Luminescence spectroscopy to characterize optical properties.
Main Results:
- A structural transition from ordered pyrochlore to disordered fluorite occurs with decreasing lanthanide ionic radius.
- Luminescence intensity of Eu3+ emission is enhanced in more ordered structures, particularly the La-based system.
- Eu3+ concentration and local site distortion influence emission probability and quantum efficiency.
Conclusions:
- Order-disorder structural transitions in lanthanide stannate pyrochlores can be used to tune Eu3+ red luminescence.
- Optimizing cation ordering is key to enhancing the luminescence properties of these phosphors for applications.
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