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Room temperature collective blinking and photon bunching from CsPbBr3 quantum dot superlattice
Qiwen Tan1,2, Sudipta Seth3, Boris Louis3
1Department of Materials Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, Meguro-ku, Tokyo, Japan.
Nature Communications
|March 28, 2026
Summary
Researchers achieved room-temperature collective blinking and photon bunching in perovskite quantum dot superlattices. This breakthrough advances quantum technologies by enabling collective optical phenomena in perovskites without extreme cooling.
Area of Science:
- Quantum optics
- Materials science
- Condensed matter physics
Background:
- Perovskite quantum dots (QDs) are promising for quantum technologies.
- Collective states, indicated by photon bunching, are essential but typically require cryogenic temperatures in perovskites.
Purpose of the Study:
- To investigate collective optical phenomena in perovskite QD superlattices at room temperature.
- To demonstrate photon bunching and understand its underlying mechanisms in these materials.
Main Methods:
- Fabrication of sub-wavelength-sized CsPbBr3 superlattices.
- Time-resolved photoluminescence spectroscopy.
- Super-resolution imaging.
- Analysis of photon bunching dynamics and power dependence.
Main Results:
- Observed distinct two-level blinking and photon bunching (degree up to 3.9) at room temperature.
- Identified long exciton lifetimes and spatially confined emission (tens of nanometers).
- Attributed photon bunching to biexciton-exciton cascade emission.
Conclusions:
- Perovskite QD superlattices enable room-temperature collective optical phenomena.
- These findings establish perovskite QD superlattices as a viable platform for advanced quantum light sources and technologies.
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