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Large two-photon cross sections and low-threshold multiphoton lasing of CdS/CdSe/CdS quantum shells

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/d3nr04203k· OSTI ID:2569775

Colloidal quantum shells are spherical semiconductor quantum wells, which have shown strong promise as optical materials, particularly in classes of experiments requiring multiple excitons. The two-photon properties of CdS/CdSe/CdS quantum shell samples are studied here to demonstrate large non-linear absorption cross-sections while retaining advantageous multiexciton physics conferred by the geometrical structure. The quantum shells have large two-phonon cross sections (0.4–7.9 × 106 GM), which highlights their potential use in upconversion imaging in which large per particle two-photon absorption is critical. Time-resolved measurements confirmed that the quantum shells have long biexciton lifetime (>10 ns in the largest core samples reported here) and large gain bandwidth (>300 meV). The combination of these attributes with large two-photon cross sections makes the CdS/CdSe/CdS quantum shells excellent gain media for two-photon excitation. With a broad gain bandwidth and long gain lifetime, quantum shell solids support multimodal amplified spontaneous emission from excitons, biexcitons, and higher excited states. In conclusion, thresholds for amplified spontaneous emission and lasing, which are as low as 1 mJ cm−2, are comparable to, or lower than, the thresholds reported for other colloidal materials.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
Grant/Contract Number:
SC0016872; AC02-06CH11357
OSTI ID:
2569775
Alternate ID(s):
OSTI ID: 2205242
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 45 Vol. 15; ISSN 2040-3364; ISSN 2040-3372
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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