期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 8, 期 20, 页码 5119-5124出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02178
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资金
- Swedish Research Council (VR)
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation
- STINT from the Swedish Foundation for International Cooperation in Research and Higher Education [CH2015-6232]
- ELI-ALPS project by European Union [GINOP-2.3.6-15-2015-00001]
- European Regional Development Fund
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NPRP from the Qatar National Research Fund [NPRP7-227-1-034]
- Interreg Oresund-Kattegat-Skagerrak
Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and red-shifted PL emission. In a broad view, the enhanced size selection in two-photon excitation of CsPbBr3 NCs is likely a general feature of the perovskite NCs and can be tuned via NC size distribution to influence their performance within NC-based nonlinear optical materials and devices.
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