skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Chirped circular dielectric gratings for near-unity collection efficiency from quantum emitters in bulk diamond

Authors:
ORCiD logo; ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413155
Grant/Contract Number:
SC0012704
Resource Type:
Journal Article: Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 26; Related Information: CHORUS Timestamp: 2017-12-13 14:27:45; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English

Citation Formats

Zheng, Jiabao, Liapis, Andreas C., Chen, Edward H., Black, Charles T., and Englund, Dirk. Chirped circular dielectric gratings for near-unity collection efficiency from quantum emitters in bulk diamond. United States: N. p., 2017. Web. doi:10.1364/OE.25.032420.
Zheng, Jiabao, Liapis, Andreas C., Chen, Edward H., Black, Charles T., & Englund, Dirk. Chirped circular dielectric gratings for near-unity collection efficiency from quantum emitters in bulk diamond. United States. doi:10.1364/OE.25.032420.
Zheng, Jiabao, Liapis, Andreas C., Chen, Edward H., Black, Charles T., and Englund, Dirk. 2017. "Chirped circular dielectric gratings for near-unity collection efficiency from quantum emitters in bulk diamond". United States. doi:10.1364/OE.25.032420.
@article{osti_1413155,
title = {Chirped circular dielectric gratings for near-unity collection efficiency from quantum emitters in bulk diamond},
author = {Zheng, Jiabao and Liapis, Andreas C. and Chen, Edward H. and Black, Charles T. and Englund, Dirk},
abstractNote = {},
doi = {10.1364/OE.25.032420},
journal = {Optics Express},
number = 26,
volume = 25,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/OE.25.032420

Save / Share:
  • Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. We find thismore » process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours.« less
    Cited by 19
  • Cited by 19
  • Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. We find thismore » process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours.« less
  • Biexciton photoluminescence (PL) quantum yields (Q 2X) of individual CdSe/CdS core-shell nanocrystal quantum dots with various shell thicknesses are derived from independent PL saturation and two-photon correlation measurements. We observe a near-unity Q{sub 2X} for some nanocrystals with an ultrathick 19-monolayer shell. High Q 2X’s are, however, not universal and vary widely among nominally identical nanocrystals indicating a significant dependence of Q 2X upon subtle structural differences. Interestingly, our measurements indicate that high Q 2X’s are not required to achieve complete suppression of PL intensity fluctuations in individual nanocrystals.
  • Cited by 109