| Authors: | I. Tanghe, M. Samoli, I. Wagner, S. A. Cayan, A. H. Khan, K. Chen, J. Hodgkiss, I. Moreels, D. Van Thourhout, Z. Hens, P. Geiregat | | Title: | Optical gain and lasing from bulk cadmium sulfide nanocrystals through bandgap renormalization | | Format: | International Journal | | Publication date: | 10/2023 | | Journal/Conference/Book: | Nature Nanotechnology
| | Editor/Publisher: | Springer, | | DOI: | 10.1038/s41565-023-01521-0 | | Citations: | 19 (Dimensions.ai - last update: 15/12/2024)
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Abstract
Strongly confined colloidal quantum dots have been investigated for low-cost light emission and lasing for nearly two decades. However, known materials struggle to combine technologically relevant metrics of low-threshold and long inverted-state lifetime with a material gain coefficient fit to match cavity losses, particularly under electrical excitation. Here we show that bulk nanocrystals of CdS combine an exceptionally large material gain of 50,000 cm−1 with best-in-class gain thresholds below a single exciton per nanocrystal and 3 ns gain lifetimes not limited by non-radiative Auger processes. We quantitatively account for these findings by invoking a strong bandgap renormalization effect, unobserved in nanocrystals to date, to the best of our knowledge. Next, we demonstrate broadband amplified spontaneous emission and lasing under quasi-continuous-wave conditions. Our results highlight the prospects of bulk nanocrystals for lasing from solution-processable materials. Related Research Topics
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