Improving the Five-Photon Absorption from Core-Shell Perovskite Nanocrystals

It is necessary to improve the action cross section (η × σn) of high-order multiphoton absorption (MPA) for fundamental research and practical applications. Herein, the core-shell FAPbBr3/CsPbBr3 nanocrystals (NCs) were constructed, and fluorescence induced by up to five-photon absorption was observed. The value of η × σ5 reaches 8.64 × 10-139 cm10 s4 photon-4 nm-3 at 2300 nm, which is nearly an order of magnitude bigger than that of the core-only NCs. It is found that the increased dielectric constant promotes modulation of MPA effects, addressing the electronic distortion in high-order nonlinear behaviors through the local field effect. Meanwhile, the quasi-type-II band alignment suppresses the biexciton Auger recombination, ensuring the stronger MPA induced fluorescence. In addition, the core-shell structure can not only reduce the defect density but also promote the nonradiative energy transfer though the antenna-like effect. This work provides a new avenue for the exploitation of high-performance multiphoton excited nanomaterials for future photonic integration.

Media Type:

Electronic Article

Year of Publication:

2023

Publication:

2023

Contained In:

To Main Record - volume:14

Contained In:

The journal of physical chemistry letters - 14(2023), 33 vom: 24. Aug., Seite 7581-7590

Language:

English

Contributors:

Zhang, Xuanyu [Author]
Xiao, Shuyu [Author]
Guo, Zhihang [Author]
Yuan, Baozhen [Author]
Wang, Xiongbin [Author]
Zhang, Samo [Author]
Shi, Yueqing [Author]
Xing, Guichuan [Author]
He, Tingchao [Author]
Chen, Rui [Author]

Links:

Volltext

Keywords:

Journal Article

Notes:

Date Revised 24.08.2023

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1021/acs.jpclett.3c01809

funding:

Supporting institution / Project title:

PPN (Catalogue-ID):

NLM360892973