Energy Transfer from Quantum Dots to Graphene and MoS2: The Role of Absorption and Screening in Two-Dimensional Materials

Research output: Contribution to journalArticle

  • External authors:
  • Archana Raja
  • Andrés Montoya-Castillo
  • Xiao Xiao Zhang
  • Ziliang Ye
  • Cyrielle Roquelet
  • Daniel A. Chenet
  • Arend M. Van Der Zande
  • Pinshane Huang
  • Steffen Jockusch
  • James Hone
  • David R. Reichman
  • Louis E. Brus
  • Tony F. Heinz

Abstract

We report efficient nonradiative energy transfer (NRET) from core–shell, semiconducting quantum dots to adjacent two-dimensional sheets of graphene and MoS2 of single- and few-layer thickness. We observe quenching of the photoluminescence (PL) from individual quantum dots and enhanced PL decay rates in time-resolved PL, corresponding to energy transfer rates of 1–10 ns–1. Our measurements reveal contrasting trends in the NRET rate from the quantum dot to the van der Waals material as a function of thickness. The rate increases significantly with increasing layer thickness of graphene, but decreases with increasing thickness of MoS2 layers. A classical electromagnetic theory accounts for both the trends and absolute rates observed for the NRET. The countervailing trends arise from the competition between screening and absorption of the electric field of the quantum dot dipole inside the acceptor layers. We extend our analysis to predict the type of NRET behavior for the near-field coupling of a chromophore to a range of semiconducting and metallic thin film materials.

Bibliographical metadata

Original languageEnglish
Pages (from-to)2328-2333
Number of pages6
JournalNano Letters
Volume16
Issue number4
DOIs
Publication statusPublished - 13 Apr 2016