Universal role of discrete acoustic phonons in the low-temperature optical emission of colloidal quantum dots

Dan Oron, Assaf Aharoni, Celso De Mello Donega, Jos Van Rijssel, Andries Meijerink, Uri Banin

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Abstract

Multiple energy scales contribute to the radiative properties of colloidal quantum dots, including magnetic interactions, crystal field splitting, Pauli exclusion, and phonons. Identification of the exact physical mechanism which couples first to the dark ground state of colloidal quantum dots, inducing a significant reduction in the radiative lifetime at low temperatures, has thus been under significant debate. Here we present measurements of this phenomenon on a variety of materials as well as on colloidal heterostructures. These show unambiguously that the dominant mechanism is coupling of the ground state to a confined acoustic phonon, and that this mechanism is universal.

Original languageEnglish
Article number177402
JournalPhysical review letters
Volume102
Issue number17
DOIs
Publication statusPublished - Apr 28 2009

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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