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Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots

(2018) NATURE MATERIALS. 17(1). p.35-41
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Abstract
Colloidal quantum dots (QDs) raise more and more interest as solution-processable and tunable optical gain materials. However, especially for infrared active QDs, optical gain remains inefficient. Since stimulated emission involves multifold degenerate band-edge states, population inversion can be attained only at high pump power and must compete with efficient multi-exciton recombination. Here, we show that mercury telluride (HgTe) QDs exhibit size-tunable stimulated emission throughout the near-infrared telecom window at thresholds unmatched by any QD studied before. We attribute this unique behaviour to surface-localized states in the bandgap that turn HgTe QDs into 4-level systems. The resulting long-lived population inversion induces amplified spontaneous emission under continuous-wave optical pumping at power levels compatible with solar irradiation and direct current electrical pumping. These results introduce an alternative approach for low-threshold QD-based gain media based on intentional trap states that paves the way for solution-processed infrared QD lasers and amplifiers.
Keywords
LIGHT-EMITTING-DIODES, NANOCRYSTALS, SILICON, DISPLACEMENT, LUMINESCENCE, SOLIDS, PBSE

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MLA
Geiregat, Pieter, et al. “Continuous-Wave Infrared Optical Gain and Amplified Spontaneous Emission at Ultralow Threshold by Colloidal HgTe Quantum Dots.” NATURE MATERIALS, vol. 17, no. 1, 2018, pp. 35–41, doi:10.1038/nmat5000.
APA
Geiregat, P., Houtepen, A., Sagar, L. K., Infante, I., Zapata, F., Grigel, V., … Hens, Z. (2018). Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots. NATURE MATERIALS, 17(1), 35–41. https://doi.org/10.1038/nmat5000
Chicago author-date
Geiregat, Pieter, Arjan Houtepen, Laxmi Kishore Sagar, Ivan Infante, Felipe Zapata, Valeriia Grigel, Guy Allan, Christophe Delerue, Dries Van Thourhout, and Zeger Hens. 2018. “Continuous-Wave Infrared Optical Gain and Amplified Spontaneous Emission at Ultralow Threshold by Colloidal HgTe Quantum Dots.” NATURE MATERIALS 17 (1): 35–41. https://doi.org/10.1038/nmat5000.
Chicago author-date (all authors)
Geiregat, Pieter, Arjan Houtepen, Laxmi Kishore Sagar, Ivan Infante, Felipe Zapata, Valeriia Grigel, Guy Allan, Christophe Delerue, Dries Van Thourhout, and Zeger Hens. 2018. “Continuous-Wave Infrared Optical Gain and Amplified Spontaneous Emission at Ultralow Threshold by Colloidal HgTe Quantum Dots.” NATURE MATERIALS 17 (1): 35–41. doi:10.1038/nmat5000.
Vancouver
1.
Geiregat P, Houtepen A, Sagar LK, Infante I, Zapata F, Grigel V, et al. Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots. NATURE MATERIALS. 2018;17(1):35–41.
IEEE
[1]
P. Geiregat et al., “Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots,” NATURE MATERIALS, vol. 17, no. 1, pp. 35–41, 2018.
@article{8533662,
  abstract     = {{Colloidal quantum dots (QDs) raise more and more interest as solution-processable and tunable optical gain materials. However, especially for infrared active QDs, optical gain remains inefficient. Since stimulated emission involves multifold degenerate band-edge states, population inversion can be attained only at high pump power and must compete with efficient multi-exciton recombination. Here, we show that mercury telluride (HgTe) QDs exhibit size-tunable stimulated emission throughout the near-infrared telecom window at thresholds unmatched by any QD studied before. We attribute this unique behaviour to surface-localized states in the bandgap that turn HgTe QDs into 4-level systems. The resulting long-lived population inversion induces amplified spontaneous emission under continuous-wave optical pumping at power levels compatible with solar irradiation and direct current electrical pumping. These results introduce an alternative approach for low-threshold QD-based gain media based on intentional trap states that paves the way for solution-processed infrared QD lasers and amplifiers.}},
  author       = {{Geiregat, Pieter and Houtepen, Arjan and Sagar, Laxmi Kishore and Infante, Ivan and Zapata, Felipe and Grigel, Valeriia and Allan, Guy and Delerue, Christophe and Van Thourhout, Dries and Hens, Zeger}},
  issn         = {{1476-1122}},
  journal      = {{NATURE MATERIALS}},
  keywords     = {{LIGHT-EMITTING-DIODES,NANOCRYSTALS,SILICON,DISPLACEMENT,LUMINESCENCE,SOLIDS,PBSE}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{35--41}},
  title        = {{Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots}},
  url          = {{http://dx.doi.org/10.1038/nmat5000}},
  volume       = {{17}},
  year         = {{2018}},
}

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