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Spectroscopic features of Ni(2+) ion in PbO-Bi2O3-SiO2 glass system
B Suresh1, M Srinivasa Reddy1, A Siva Sesha Reddy2
1Department of Physics, Univ. College of Engg and Technology, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 16, 2015
Summary
Nickel ions in novel glasses occupy both octahedral and tetrahedral sites, with octahedral sites preferred at higher concentrations. This leads to enhanced near-infrared luminescence, ideal for optical applications.
Area of Science:
- Materials Science
- Solid State Chemistry
- Spectroscopy
Background:
- Understanding the local structure and optical properties of transition metal ions in glass matrices is crucial for developing new optical materials.
- Nickel ions (Ni2+) are known to exhibit interesting luminescence properties depending on their coordination environment.
Purpose of the Study:
- To synthesize novel glasses doped with varying concentrations of nickel oxide (NiO).
- To investigate the structural and optical properties of these glasses using various spectroscopic techniques.
- To correlate the nickel ion coordination with luminescence characteristics.
Main Methods:
- Synthesis of (30-x)PbO-5Bi2O3-65SiO2: xNiO glasses (x = 0–1.0 mol%).
- Spectroscopic analysis including Infrared (IR), Raman, optical absorption, and luminescence spectroscopy.
- Analysis of spectral data to determine nickel ion coordination and luminescence parameters.
Main Results:
- Spectroscopic studies confirmed that Ni2+ ions occupy both octahedral and tetrahedral sites in the glass network.
- Increasing NiO concentration favored octahedral coordination for Ni2+ ions.
- A broad near-infrared (NIR) emission band was observed between 1100–1500 nm, attributed to the octahedral (3)T2(3F)→(3)A2(3F) transition of Ni2+.
- Luminescence efficiency and cross-section were highest in glasses with the maximum NiO concentration.
Conclusions:
- The study elucidates the structural role of Ni2+ ions in silicate glasses and their impact on luminescence.
- The synthesized glasses exhibit promising NIR luminescence properties, with potential applications in optical devices.
- Structural variations in the host glass network significantly influence luminescence efficiency.
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