| Author | Chen, Junsheng |
| Author | Chábera, Pavel |
| Author | Pascher, Torbjörn |
| Author | Messing, Maria E. |
| Author | Schaller, Richard |
| Author | Canton, Sophie |
| Author | Zheng, Kaibo |
| Author | Pullerits, Tõnu |
| Available date | 2020-10-13T10:54:02Z |
| Publication Date | 2017 |
| Publication Name | Journal of Physical Chemistry Letters |
| Resource | Scopus |
| ISSN | 19487185 |
| URI | http://dx.doi.org/10.1021/acs.jpclett.7b02178 |
| URI | http://hdl.handle.net/10576/16417 |
| Abstract | 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. 1 2017 American Chemical Society. |
| Sponsor | This work was financed by the Swedish Research Council (VR), Swedish Energy Agency, the Knut and Alice Wallenberg Foundation, STINT grant #CH2015-6232 from the Swedish Foundation for International Cooperation in Research and Higher Education, and NPRP grant # NPRP7-227-1-034 from the Qatar National Research Fund, Interreg Öresund-Kattegat-Skagerrak, and European regional development fund. We acknowledge collaboration within NanoLund. S.C. is grateful for the support from the ELI-ALPS project (GINOP-2.3.6-15-2015-00001) by the European Union and cofinanced by the European Regional Development Fund. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. |
| Language | en |
| Publisher | American Chemical Society |
| Title | Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals |
| Type | Article |
| Pagination | 5119-5124 |
| Issue Number | 20 |
| Volume Number | 8 |
|
dc.accessType
| Abstract Only |
