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RESEARCH PRODUCT
Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots
Pavel CháberaTõnu PulleritsLauri NuuttilaMaria E. MessingPengfei ChengHeli LehtivuoriKarel ŽíDekKarel ŽíDekJunsheng ChenJunsheng ChenKe-li HanDongzhou LiuDongzhou LiuKaibo ZhengKaibo ZhengMohammed J. Al-marrisubject
PhotonSDG 16 - PeaceExcitonAnalytical chemistryPhysics::Opticsquantum dots02 engineering and technology010402 general chemistry01 natural sciencesTwo-photon absorptionMolecular physicsCsPbBr3 Perovskite Quantum DotsCondensed Matter::Materials ScienceUltrafast laser spectroscopyGeneral Materials SciencePhysical and Theoretical ChemistrySpectroscopyAbsorption (electromagnetic radiation)Perovskite (structure)ta114ChemistrySDG 16 - Peace Justice and Strong Institutions021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect/dk/atira/pure/sustainabledevelopmentgoals/peace_justice_and_strong_institutionsJustice and Strong Institutions0104 chemical sciencesQuantum dot0210 nano-technologydescription
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. This 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). Scopus
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-05-18 |