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

Junsheng Chen, Karel Žídek, Pavel Chábera, Dongzhou Liu, Pengfei Cheng, Lauri Nuuttila, Jaber Al Marri, Heli Lehtivuori, Maria E. Messing, Keli Han, Kaibo Zheng, Tõnu Pullerits

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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.

Original languageEnglish
Pages (from-to)2316-2321
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number10
Publication statusPublished - 18 May 2017
Externally publishedYes


ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Chen, J., Žídek, K., Chábera, P., Liu, D., Cheng, P., Nuuttila, L., Al Marri, J., Lehtivuori, H., Messing, M. E., Han, K., Zheng, K., & Pullerits, T. (2017). Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots. Journal of Physical Chemistry Letters, 8(10), 2316-2321.