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We engineered colloidal 2D quantum wells for bright single-photon emission. This novel design overcomes previous limitations, paving the way for advanced quantum technologies.

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Area of Science:

  • Quantum optics and materials science.
  • Nanotechnology and quantum information science.

Background:

  • Colloidal quasi two-dimensional (2D) quantum wells (QWs) are promising for single-photon sources (SPSs) due to high emission uniformity and quantum yields.
  • However, large lateral dimensions and multiexciton emission have limited their application as ideal SPSs.

Purpose of the Study:

  • To demonstrate bright room-temperature single-photon emission (SPE) with high purity and minimal blinking from in-plane-engineered (IPE) 2D QWs.
  • To establish deterministic design rules for high-performance colloidal 2D QWs as SPSs for scalable quantum technologies.

Main Methods:

  • Fabrication of in-plane-engineered (IPE) 2D QWs with a doubly gradient architecture.
  • Utilizing a compositionally graded CdSe/CdSexS1-x core to control electron-hole wavefunctions and Auger dynamics.
  • Employing a graded CdyZn1-yS shell to suppress interfacial strain and nonradiative defects.

Main Results:

  • Achieved near-unity ensemble photoluminescence quantum yield (PLQY) and bright SPE (0.6-1.2 × 105 counts/s, NA = 0.65).
  • Attained 92% single-photon purity with a 2 nm core and suppressed blinking with a 96.9% ON-time fraction for an 8 nm core.
  • Demonstrated high-performance SPE with minimal blinking and high purity at room temperature.

Conclusions:

  • The developed doubly gradient architecture effectively unites 0D and 2D structural advantages in colloidal 2D QWs.
  • This work provides deterministic design rules for creating high-performance SPSs from colloidal 2D QWs.
  • The engineered QWs are suitable for scalable quantum technologies requiring bright and pure single-photon emission.