Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 12, Pages 4817-4825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00967
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Funding
- Natural Science Foundation of Guangdong Province [2019A1515012094, 2018A030310635, 2019A1515111093]
- Project of Department of Education of Guangdong Province [2018KTSCX19]
- Shenzhen Basic Research Project of Science and Technology [JCYJ20190808121211510, JCYJ20170818142921044]
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All-inorganic perovskite (CsPbX3, X = Cl, Br, I) nanorods (NRs) not only retain their inherent advantages such as a high photoluminescence quantum yield and broad wavelength tunability but also exhibit superior photophysical properties including their extremely strong multiphoton absorption (MPA). However, the spectral dynamics and MPA properties of CsPbX3 NRs have not been fully investigated. Here, we report comprehensive comparison studies on the femtosecond spectral dynamical properties of CsPb(Br0.8Cl0.2)(3), CsPbBr3, and CsPb(Br0.85I0.15)(3) NRs, including their influences on their hot-carrier cooling, biexciton lifetime, and biexciton binding energy. Interestingly, although the three kinds of perovskite NRs have similar diameters and lengths, they differ significantly in their nonlinear optical properties, among which the CsPb(Br0.85I0.15)(3) displayed the greatest MPA cross sections. Furthermore, the multiphoton-excited stimulated emission of CsPb(Br0.8Cl0.2)(3) and CsPbBr3 NRs is demonstrated. This work indicates that CsPbX3 (X = Cl, Br, I) NRs are excellent candidates for exploring their applications in different optoelectronic devices.
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