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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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Photon bunching in cathodoluminescence.

S Meuret1, L H G Tizei1, T Cazimajou1

  • 1Laboratoire de Physique des Solides, UMR 8502 CNRS and Université Paris-Sud, Orsay 91405, France.

Physical Review Letters
|May 30, 2015
PubMed
Summary
This summary is machine-generated.

Fast electron excitation of semiconductor nanocrystals reveals synchronized defect center emission. This cathodoluminescence shows significant bunching, unlike photoluminescence, due to plasmon deexcitation effects.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Nanotechnology

Background:

  • Wide band-gap semiconductor nanocrystals, such as diamond and hexagonal boron nitride, host defect centers with unique optical properties.
  • Characterizing quantum emitters requires understanding their emission statistics, often probed by second-order correlation functions (g^{(2)}(τ)).

Purpose of the Study:

  • To measure and analyze the second-order correlation function (g^{(2)}(τ)) of cathodoluminescence from defect centers in diamond and hexagonal boron nitride nanocrystals.
  • To investigate the distinct emission behavior under fast electron excitation compared to photoluminescence.

Main Methods:

  • Cathodoluminescence (CL) spectroscopy was employed to excite defect centers in semiconductor nanocrystals.
  • The second-order correlation function (g^{(2)}(τ)) of the CL intensity was measured as a function of delay time (τ).
  • A theoretical model was developed to interpret the observed correlation functions.

Main Results:

  • Cathodoluminescence from multiple defect centers exhibited significant zero-delay bunching (g^{(2)}(0)>30).
  • This bunching contrasts sharply with the flat g^{(2)}(τ) observed in photoluminescence measurements.
  • The observed bunching was successfully modeled as arising from synchronized emission of defect centers.

Conclusions:

  • Fast electron excitation induces synchronized emission from multiple defect centers in wide band-gap semiconductor nanocrystals.
  • This synchronization is attributed to the deexcitation of a bulk plasmon into multiple electron-hole pairs, exciting several defect centers simultaneously.
  • The findings highlight a unique excitation pathway for quantum emitters in nanomaterials with potential applications in quantum technologies.