Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots

Research output: Contribution to journalArticle

Abstract

All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr3 QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained power-law dependence suggests that the TPA process through a virtual state populates exciton band states. The revealed power-law dependence and the understanding of TPA process are important for developing high performance nonlinear optical devices based on CsPbBr3 nanocrystals.

Details

Authors
Organisations
External organisations
  • Dalian Institute of Chemical Physics
  • University of Jyväskylä
  • Qatar University
  • Institute of Plasma Physics, Academy of Sciences of the Czech Republic
  • Agricultural University of Hebei
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics
Original languageEnglish
Pages (from-to)2316-2321
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume8
Issue number10
Publication statusPublished - 2017 May 18
Publication categoryResearch
Peer-reviewedYes

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