期刊
NATURE MATERIALS
卷 17, 期 1, 页码 35-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT5000
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资金
- Ghent University (Special Research Fund BOF)
- BelSPo [IAP 7.35]
- EU
- NWO [723.013.002]
- ERC-ULPICC
- ERC-PoC Interdot
- FWO Vlaanderen
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.
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