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Assessing Disaster Resilience of Concrete with Titanium Dioxide Nanoparticles
Published on: November 14, 2025
315
Room-temperature single-photon emitters in titanium dioxide optical defects
Kelvin Chung1, Yu H Leung2,3, Chap H To2
1School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia.
Beilstein Journal of Nanotechnology
|May 3, 2018
Summary
Researchers discovered room-temperature single-photon emission from optical defects in titanium dioxide. This finding reveals a novel single-photon source in a wide bandgap semiconductor, with potential applications in quantum technologies.
Area of Science:
- Materials Science
- Quantum Optics
- Solid-State Physics
Background:
- Crystallographic point defects in semiconductors can exhibit unique optical properties.
- Titanium dioxide (TiO2) is a wide bandgap semiconductor with diverse applications.
- The development of efficient single-photon sources is crucial for quantum information technologies.
Purpose of the Study:
- To investigate the fluorescence properties of crystallographic point defects in various titanium dioxide morphologies.
- To identify and characterize room-temperature single-photon emitters in titanium dioxide.
Main Methods:
- Investigation of fluorescence properties of point defects in different TiO2 morphologies.
- Analysis of g(2) correlation data to identify three-level defect systems.
- Observation of photodynamics (stable and blinking) of single-photon emitters.
Main Results:
- First-time discovery of room-temperature single-photon emission from optical defects in TiO2 thin films and nanoparticles.
- Identification of three-level defects based on characteristic shoulders in g(2) correlation data.
- Observation of both stable and blinking photodynamics in the identified single-photon emitters.
Conclusions:
- Titanium dioxide hosts a novel room-temperature single-photon source.
- These findings open new avenues for developing quantum light sources based on wide bandgap semiconductors.
- The discovered defects in TiO2 offer a promising platform for integrated quantum photonic devices.
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