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

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

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Abstract

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.
Original languageEnglish
Pages (from-to)1199-1202
Number of pages4
JournalScience
Volume363
Issue number6432
DOIs
Publication statusPublished - 15 Mar 2019

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    Hanifi, D. A., Bronstein, N. D., Koscher, B. A., Nett, Z., Swabeck, J. K., Takano, K., Schwartzberg, A. M., Maserati, L., Vandewal, K., van de Burgt, Y., Salleo, A., & Alivisatos, A. P. (2019). Redefining near-unity luminescence in quantum dots with photothermal threshold quantum yield. Science, 363(6432), 1199-1202. https://doi.org/10.1126/science.aat3803