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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multidimensional coherent spectroscopy reveals triplet state coherences in cesium lead-halide perovskite nanocrystals

Full text
Author(s):
Liu, Albert [1] ; Almeida, Diogo B. [1] ; Bonato, Luiz G. [2] ; Nagamine, Gabriel [3] ; Zagonel, Luiz F. [3] ; Nogueira, Ana F. [2] ; Padilha, Lazaro A. [3] ; Cundiff, S. T. [1]
Total Authors: 8
Affiliation:
[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 - USA
[2] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SCIENCE ADVANCES; v. 7, n. 1 JAN 2021.
Web of Science Citations: 0
Abstract

Advances in optoelectronics require materials with novel and engineered characteristics. A class of materials that has garnered tremendous interest is metal-halide perovskites, stimulated by meteoric increases in photovoltaic efficiencies of perovskite solar cells. In addition, recent advances have applied perovskite nanocrystals (NCs) in light-emitting devices. It was found recently that, for cesium lead-halide perovskite NCs, their unusually efficient light emission may be due to a unique excitonic fine structure composed of three bright triplet states that minimally interact with a proximal dark singlet state. To study this fine structure without isolating single NCs, we use multidimensional coherent spectroscopy at cryogenic temperatures to reveal coherences involving triplet states of a CsPbI3 NC ensemble. Picosecond time scale dephasing times are measured for both triplet and inter-triplet coherences, from which we infer a unique exciton fine structure level ordering composed of a dark state energetically positioned within the bright triplet manifold. (AU)

FAPESP's process: 13/16911-2 - Advanced spectroscopy of novel nanomaterials
Grantee:Lázaro Aurélio Padilha Junior
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/50011-7 - Two-dimensional spectroscopy of novel nanomaterials
Grantee:Lázaro Aurélio Padilha Junior
Support Opportunities: Regular Research Grants