Journal article
Resonantly pumped bright-triplet exciton lasing in cesium lead bromide perovskites
- Abstract:
- The surprising recent observation of highly emissive triplet-states in lead halide perovskites accounts for their orders-of-magnitude brighter optical signals and high quantum efficiencies compared to other semiconductors. This makes them attractive for future optoelectronic applications, especially in bright low-threshold nanolasers. While nonresonantly pumped lasing from all-inorganic lead-halide perovskites is now well-established as an attractive pathway to scalable low-power laser sources for nano-optoelectronics, here we showcase a resonant optical pumping scheme on a fast triplet-state in CsPbBr<sub>3</sub> nanocrystals. The scheme allows us to realize a polarized triplet-laser source that dramatically enhances the coherent signal by 1 order of magnitude while suppressing noncoherent contributions. The result is a source with highly attractive technological characteristics, including a bright and polarized signal and a high stimulated-to-spontaneous emission signal contrast that can be filtered to enhance spectral purity. The emission is generated by pumping selectively on a weakly confined excitonic state with a Bohr radius ∼10 nm in the nanocrystals. The exciton fine-structure is revealed by the energy-splitting resulting from confinement in nanocrystals with tetragonal symmetry. We use a linear polarizer to resolve 2-fold nondegenerate sublevels in the triplet exciton and use photoluminescence excitation spectroscopy to determine the energy of the state before pumping it resonantly.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 3.4MB, Terms of use)
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- Publisher copy:
- 10.1021/acsphotonics.1c00720
Authors
- Publisher:
- American Chemical Society
- Journal:
- ACS Photonics More from this journal
- Volume:
- 8
- Issue:
- 9
- Pages:
- 2699-2704
- Publication date:
- 2021-08-27
- Acceptance date:
- 2021-08-20
- DOI:
- EISSN:
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2330-4022
- ISSN:
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2330-4022
- Pmid:
-
34557568
- Language:
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English
- Keywords:
- Pubs id:
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1195948
- Local pid:
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pubs:1195948
- Deposit date:
-
2021-11-23
Terms of use
- Copyright holder:
- Ying et al.
- Copyright date:
- 2021
- Rights statement:
- ©2021 The Authors. Published by American Chemical Society. This article is licensed under a Creative Commons Attribution 4.0 International License (CC-BY).
- Licence:
- CC Attribution (CC BY)
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