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AuthorChen, Junsheng
AuthorZidek, Karel
AuthorChabera, Pavel
AuthorLiu, Dongzhou
AuthorCheng, Pengfei
AuthorNuuttila, Lauri
AuthorAl-Marri, Mohammed J.
AuthorLehtivuori, Heli
AuthorMessing, Maria E.
AuthorHan, Keli
AuthorZheng, Kaibo
AuthorPullerits, Tonu
Available date2020-09-20T08:35:38Z
Publication Date2017
Publication NameJournal of Physical Chemistry Letters
ResourceScopus
ISSN19487185
URIhttp://dx.doi.org/10.1021/acs.jpclett.7b00613
URIhttp://hdl.handle.net/10576/16190
AbstractAll-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.
SponsorThis work was financed by the Swedish Research Council (VR) the Knut and Alice Wallenberg Foundation, and NPRP Grant # NPRP7-227-1-034 from the Qatar National Research Fund, Interreg Oresund-Kattegat-Skagerrak European regional development fund, and the Program of Study Abroad for Young Teachers by the Agricultural University of Hebei. Keli Han thanks the support from the National Natural Science Foundation of China (Grant No: 21533010).
Languageen
PublisherAmerican Chemical Society
SubjectCsPbBr3 Perovskite Quantum Dots
TitleSize-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots
TypeArticle
Pagination2316-2321
Issue Number10
Volume Number8
dc.accessType Abstract Only


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