Nature, volume 544, issue 7648, pages 75-79

Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy

Fengjia Fan 1
Oleksandr Voznyy 1
Randy P Sabatini 1
Kristopher T Bicanic 1
Michael M Adachi 1, 2
James R Mcbride 3
Kemar R Reid 3
Young-Shin Park 4, 5
Xiyan Li 1
Ankit Jain 1
Rafael Quintero Bermudez 1
Mayuran Saravanapavanantham 1
Min Liu 1
Marek Korkusinski 6
Pawel Hawrylak 7
Victor I. Klimov 4
Sandra J. Rosenthal 3
Sjoerd Hoogland 1
Edward H Sargent 1
1
 
Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada
5
 
Center For High Technology Materials, University Of New Mexico, Albuquerque, USA
6
 
Emerging Technologies Division, Security and Disruptive Technologies, National Research Council, Ottawa, Canada
7
 
Physics Department, University of Ottawa, Ottawa, Canada
Publication typeJournal Article
Publication date2017-03-20
Journal: Nature
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor64.8
ISSN00280836, 14764687
Multidisciplinary
Abstract
By switching shell growth on and off on the (0001) facet of wurtzite CdSe cores to produce a built-in biaxial strain that lowers the optical gain threshold, we achieve continuous-wave lasing in colloidal quantum dot films. The electronic structure of colloidal quantum dots lends them a host of desirable optical properties, but they typically perform poorly as laser materials. Fengjia Fan et al. have developed a scheme for tuning this electronic structure in such a way that the barriers to laser action might be overcome. Specifically, they developed a synthesis strategy in which the shell of material encompassing the core of the quantum dot is asymmetric and compressive. This effectively squeezes the particle, thereby modifying the electronic structure to favour laser-like emissions. Colloidal quantum dots (CQDs) feature a low degeneracy of electronic states at the band edges compared with the corresponding bulk material1, as well as a narrow emission linewidth2,3. Unfortunately for potential laser applications, this degeneracy is incompletely lifted in the valence band, spreading the hole population among several states at room temperature4,5,6. This leads to increased optical gain thresholds, demanding high photoexcitation levels to achieve population inversion (more electrons in excited states than in ground states—the condition for optical gain). This, in turn, increases Auger recombination losses7, limiting the gain lifetime to sub-nanoseconds and preventing steady laser action8,9. State degeneracy also broadens the photoluminescence linewidth at the single-particle level10. Here we demonstrate a way to decrease the band-edge degeneracy and single-dot photoluminescence linewidth in CQDs by means of uniform biaxial strain. We have developed a synthetic strategy that we term facet-selective epitaxy: we first switch off, and then switch on, shell growth on the (0001) facet of wurtzite CdSe cores, producing asymmetric compressive shells that create built-in biaxial strain, while still maintaining excellent surface passivation (preventing defect formation, which otherwise would cause non-radiative recombination losses). Our synthesis spreads the excitonic fine structure uniformly and sufficiently broadly that it prevents valence-band-edge states from being thermally depopulated. We thereby reduce the optical gain threshold and demonstrate continuous-wave lasing from CQD solids, expanding the library of solution-processed materials11,12 that may be capable of continuous-wave lasing. The individual CQDs exhibit an ultra-narrow single-dot linewidth, and we successfully propagate this into the ensemble of CQDs.

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GOST Copy
Fan F. et al. Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy // Nature. 2017. Vol. 544. No. 7648. pp. 75-79.
GOST all authors (up to 50) Copy
Fan F., Voznyy O., Sabatini R. P., Bicanic K. T., Adachi M. M., Mcbride J. R., Reid K. R., Park Y., Li X., Jain A., Quintero Bermudez R., Saravanapavanantham M., Liu M., Korkusinski M., Hawrylak P., Klimov V. I., Rosenthal S. J., Hoogland S., Sargent E. H. Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy // Nature. 2017. Vol. 544. No. 7648. pp. 75-79.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1038/nature21424
UR - https://doi.org/10.1038/nature21424
TI - Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy
T2 - Nature
AU - Fan, Fengjia
AU - Voznyy, Oleksandr
AU - Sabatini, Randy P
AU - Bicanic, Kristopher T
AU - Adachi, Michael M
AU - Mcbride, James R
AU - Reid, Kemar R
AU - Park, Young-Shin
AU - Li, Xiyan
AU - Jain, Ankit
AU - Quintero Bermudez, Rafael
AU - Saravanapavanantham, Mayuran
AU - Liu, Min
AU - Korkusinski, Marek
AU - Hawrylak, Pawel
AU - Klimov, Victor I.
AU - Rosenthal, Sandra J.
AU - Hoogland, Sjoerd
AU - Sargent, Edward H
PY - 2017
DA - 2017/03/20 00:00:00
PB - Springer Nature
SP - 75-79
IS - 7648
VL - 544
SN - 0028-0836
SN - 1476-4687
ER -
BibTex |
Cite this
BibTex Copy
@article{2017_Fan,
author = {Fengjia Fan and Oleksandr Voznyy and Randy P Sabatini and Kristopher T Bicanic and Michael M Adachi and James R Mcbride and Kemar R Reid and Young-Shin Park and Xiyan Li and Ankit Jain and Rafael Quintero Bermudez and Mayuran Saravanapavanantham and Min Liu and Marek Korkusinski and Pawel Hawrylak and Victor I. Klimov and Sandra J. Rosenthal and Sjoerd Hoogland and Edward H Sargent},
title = {Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy},
journal = {Nature},
year = {2017},
volume = {544},
publisher = {Springer Nature},
month = {mar},
url = {https://doi.org/10.1038/nature21424},
number = {7648},
pages = {75--79},
doi = {10.1038/nature21424}
}
MLA
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MLA Copy
Fan, Fengjia, et al. “Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy.” Nature, vol. 544, no. 7648, Mar. 2017, pp. 75-79. https://doi.org/10.1038/nature21424.
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