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Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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2D NMR: Overview of Heteronuclear Correlation Techniques

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IR Absorption Frequency: Hybridization01:21

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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High-Performance Near-Infrared Quantum Emission from Color Centers in hBN.

Sean Doan1, Sahil D Patel2, Yilin Chen3

  • 1Physics Department, University of California, Santa Barbara, California 93106, United States.

ACS Nano
|July 2, 2026
PubMed
Summary

Researchers developed an oxygen-plasma process to create high-performance near-infrared (NIR) quantum emitters in hexagonal boron nitride (hBN). These emitters are crucial for advancing quantum communication and networking technologies.

Keywords:
2D materialshexagonal boron nitridequantum emissionquantum photonicssingle-photon emission

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Area of Science:

  • Quantum Optics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Hexagonal boron nitride (hBN) is a van der Waals material hosting quantum defects for quantum technologies.
  • Existing hBN emitters have limitations in spectral range and performance for quantum networking.

Purpose of the Study:

  • To develop a scalable method for creating high-performance near-infrared (NIR) quantum emitters in hBN.
  • To characterize the optical and stability properties of these novel emitters.

Main Methods:

  • Oxygen-plasma treatment of hBN to create quantum emitters.
  • Optical spectroscopy (photoluminescence, lifetime measurements) to characterize emitters.
  • First-principles calculations to identify defect structures.

Main Results:

  • Reproducible creation of blinking-free NIR quantum emitters (700-971 nm) in hBN.
  • Achieved MHz brightness, >99.9% single-photon purity, and 2.7 GHz linewidths.
  • Demonstrated excellent photostability, spectral stability, and weak vibronic coupling.

Conclusions:

  • Oxygen incorporation is key to activating NIR emitters in hBN, likely ONVN or ONVNH defects.
  • This work establishes a high-performance NIR quantum emitter platform in hBN for quantum networking and integrated photonics.