Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots

O. Voznyy, E. H. Sargent

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Optoelectronic applications of colloidal quantum dots demand a high emission efficiency, stability in time, and narrow spectral bandwidth. Electronic trap states interfere with the above properties but understanding of their origin remains lacking, inhibiting the development of robust passivation techniques. Here we show that surface vacancies improve the fluorescence yield compared to vacancy-free surfaces, while dynamic vacancy aggregation can temporarily turn fluorescence off. We find that infilling with foreign cations can stabilize the vacancies, inhibiting intermittency and improving quantum yield, providing an explanation of recent experimental observations. © 2014 American Physical Society.
Original languageEnglish (US)
JournalPhysical Review Letters
Volume112
Issue number15
DOIs
StatePublished - Apr 16 2014
Externally publishedYes

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