Highly Photostable Zn-Treated Halide Perovskite Nanocrystals for Efficient Single Photon Generation

Area of Science:

• Quantum optics and photonics
• Materials science and nanotechnology
• Solid-state quantum emitters

Background:

• Pure single-photon emission is crucial for quantum computing, quantum key distribution, and quantum metrology.
• Colloidal lead halide perovskite (LHP) nanocrystals are promising solid-state quantum emitters due to their optical properties.
• Environmental instabilities hinder the practical application of LHP nanocrystals as single-photon sources (SPSs).

Purpose of the Study:

• To improve the environmental stability and performance of LHP nanocrystals for SPS applications.
• To investigate the effect of Zn2+ ion doping on the properties of CsPbBr3 colloidal nanocrystals.
• To demonstrate enhanced stability under dilution and illumination conditions.

Main Methods:

• Systematic fabrication and characterization of Zn-treated CsPbBr3 colloidal nanocrystals.
• Zn2+ ion doping at the Pb-site within the perovskite lattice.
• Evaluation of single-photon purity, blinking dynamics, and photostability under varying excitation powers and conditions.

Main Results:

• Zn-treated CsPbBr3 nanocrystals exhibit significantly improved stability under dilution and illumination.
• The doped nanocrystals demonstrate high single-photon purity.
• Reduced blinking on a submillisecond timescale and stable bright-state emission were observed even at high excitation powers.

Conclusions:

• Zn-doping is an effective strategy to enhance the stability and performance of LHP-based SPSs.
• Optimized LHP nanocrystals show great potential for integration into nanophotonic systems for quantum technologies.
• This synthesis approach offers promising prospects for advancing quantum technology applications requiring reliable single-photon sources.