| Full text | |
| Author(s): |
Liu, Albert
;
Nagamine, Gabriel
;
Bonato, Luiz G.
;
Almeida, Diogo B.
;
Zagonel, Luiz F.
;
Nogueira, Ana F.
;
Padilha, Lazaro A.
;
Cundiff, Steven T.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | ACS NANO; v. 15, n. 4, p. 8-pg., 2021-03-26. |
| Abstract | |
Perovskite nanoplatelets possess extremely narrow absorption and emission line widths, which are crucial characteristics for many optical applications. However, their underlying intrinsic and extrinsic line-broadening mechanisms are poorly understood. Here, we apply multidimensional coherent spectroscopy to determine the homogeneous line broadening of colloidal perovskite nanoplatelet ensembles. We demonstrate a dependence of not only their intrinsic line widths but also of various broadening mechanisms on platelet geometry. We find that decreasing nanoplatelet thickness by a single monolayer results in a 2-fold reduction of the inhomogeneous line width and a 3-fold reduction of the intrinsic homogeneous line width to the sub-millielectronvolts regime. In addition, our measurements suggest homogeneously broadened exciton resonances in two-layer (but not necessarily three-layer) nanoplatelets at room-temperature. (AU) | |
| FAPESP's process: | 18/15574-6 - Advanced spectroscopy of nanomaterials: from ensemble to single-particle |
| Grantee: | Lázaro Aurélio Padilha Junior |
| Support Opportunities: | Research Grants - Young Investigators Grants - Phase 2 |
| FAPESP's process: | 19/22576-8 - Accessing the excited state dynamics in nanostructures by multidimensional coherent spectroscopy |
| Grantee: | Diogo Burigo Almeida |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |