Redefining near-unity luminescence in quantum dots with photothermal threshold quantum yield

Hanifi, David A.; Bronstein, Noah D.; Koscher, Brent A.; Nett, Zach; Swabeck, Joseph K.; Takano, Kaori; Schwartzberg, Adam M.; Maserati, Lorenzo; Vandewal, Koen; van de Burgt, Yoeri; Salleo, Alberto; Alivisatos, A. Paul

doi:10.1126/science.aat3803

Redefining near-unity luminescence in quantum dots with photothermal threshold quantum yield

Journal Article · Thu Mar 14 00:00:00 EDT 2019 · Science

DOI:https://doi.org/10.1126/science.aat3803· OSTI ID:1547624

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A variety of optical applications rely on the absorption and reemission of light. The quantum yield of this process often plays an essential role. When the quantum yield deviates from unity by significantly less than 1%, applications such as luminescent concentrators and optical refrigerators become possible. To evaluate such high performance, we develop a measurement technique for luminescence efficiency with sufficient accuracy below one part per thousand. Photothermal threshold quantum yield is based on the quantization of light to minimize overall measurement uncertainty. This technique is used to guide a procedure capable of making ensembles of near-unity emitting cadmium selenide/cadmium sulfide (CdSe/CdS) core-shell quantum dots. We obtain a photothermal threshold quantum yield luminescence efficiency of 99.6 ± 0.2%, indicating nearly complete suppression of nonradiative decay channels.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Photonics at Thermodynamic Limits (PTL); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )

Grant/Contract Number:: AC02-05CH11231; SC0019140

OSTI ID:: 1547624

Alternate ID(s):: OSTI ID: 1506408

Journal Information:: Science, Journal Name: Science Journal Issue: 6432 Vol. 363; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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