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Photoluminescence: Applications

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

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Precise Sn-Doping Modulation for Optimizing CdWO₄ Nanorod Photoluminescence.

K Manjunatha¹, Ming-Kang Ho¹, Tsu-En Hsu¹

¹Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.

International Journal of Molecular Sciences

|December 11, 2022

Summary

Tin-doped cadmium tungstate nanorods exhibit tunable luminescence properties. Increased tin content alters emission color and reduces photoluminescence intensity, offering potential for advanced optical applications.

Keywords:

CdWO4 rods Raman spectra Sn-doping photoluminescence synchrotron-based PXRD

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Area of Science:

Materials Science
Solid State Chemistry
Nanotechnology

Background:

Cadmium tungstate (CdWO4) nanorods are recognized for their luminescent properties and potential in various applications.
Doping with tin (Sn) offers a method to modulate the optical characteristics of CdWO4.

Purpose of the Study:

To synthesize and characterize single crystalline Sn-doped CdWO4 nanorods (NRDs).
To investigate the impact of Sn doping concentration on the structural, optical, and photoluminescent properties of CdWO4 NRDs.

Main Methods:

Synthesis of Sn-doped Cd1-xSnxWO4 (x = 0, 1, 3, 5%) nanorods.
Characterization using X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM).
Photoluminescence (PL) spectroscopy and time decay measurements.

Main Results:

Monoclinic phase confirmed with crystallite size decreasing from 62 to 38 nm as Sn concentration increased.
PL intensity decreased with rising Sn content due to enhanced electron-hole recombination.
Emission color shifted from sky blue to light green with increasing Sn content, linked to defect density.
Photoluminescence decay times were analyzed, with average lifetimes around 1 ns.

Conclusions:

Sn doping effectively modulates the structural and luminescent properties of CdWO4 NRDs.
The observed changes in emission color and PL intensity provide insights into electron transitions and defect physics.
These findings highlight the potential of Sn-doped CdWO4 NRDs for applications in bio-imaging, light sources, and displays.