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Defect controlled UV-to-visible down conversion in Bi3+-doped Y2Zr2O7 monoclinic-like phosphors
Ashok Kumar Srivastava1, D Anand2, K Ramachandran1
1Department of Physics, SRM Institute of Science and Technology, Faculty of Engineering and Technology Vadapalani Campus Chennai-600 026 Tamil Nadu India ramachak1@srmist.edu.in.
RSC Advances
|July 10, 2026
Summary
Researchers developed cost-effective, lanthanide-free phosphors using bismuth-doped Y2Zr2O7. These materials efficiently convert UV light to visible light, showing promise for solid-state lighting and optoelectronics.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Luminescence
Background:
- Down-conversion phosphors are crucial for solid-state lighting and optoelectronics, converting UV light to visible emission.
- Controlling defects in phosphors is challenging, as increased dopant concentration often leads to detrimental traps.
Purpose of the Study:
- To synthesize and characterize novel bismuth (Bi3+)-doped Y2Zr2O7 phosphors.
- To investigate their UV-to-visible down-conversion properties and potential applications.
Main Methods:
- High-temperature solid-state reaction method for synthesis.
- X-ray diffraction (XRD) for structural analysis.
- Scanning electron microscopy (SEM) for morphology.
- X-ray photoelectron spectroscopy (XPS) for electronic states.
- UV diffuse reflectance spectroscopy (UV-DRS) for optical properties.
- Photoluminescence (PL) spectroscopy for emission characteristics.
Main Results:
- Formation of distorted monoclinic-like Y2Zr2O7 structure with successful Bi3+ doping and oxygen vacancy defects.
- UV-DRS indicated a narrow bandgap and stabilized disorder with increasing dopant concentration.
- PL spectroscopy confirmed efficient UV-to-visible down-conversion emission via Bi3+ and oxygen vacancy mechanisms.
- Chromaticity analysis showed stable cyan-blue emission with high correlated color temperature (CCT).
Conclusions:
- Bi3+-doped Y2Zr2O7 phosphors exhibit excellent UV-to-visible down-conversion capabilities.
- The defect-controlled synthesis offers a pathway to stable, cost-effective phosphors.
- These phosphors are promising candidates for optoelectronic and solid-state lighting applications.
