Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr<sub>3</sub> Nanocrystal Films Coupled with a TiO<sub>2</sub> Grating
Enhancing light emission from perovskite nanocrystal (NC) films is essential in light-emitting devices, as their conventional stacks often restrict the escape of emitted light. This work addresses this challenge by employing a TiO<sub>2</sub> grating to enhance light extraction and shape the emission of CsPbBr<sub>3</sub> nanocrystal films. Angle-resolved photoluminescence (PL) demonstrated a 10-fold increase in emission intensity by coupling the Bloch resonances of the grating with the spontaneous emission of the perovskite NCs. Fluorescence lifetime imaging microscopy (FLIM) provided micrometer-resolution mapping of both PL intensity and lifetime across a large area, revealing a decrease in PL lifetime from 8.2 ns for NC films on glass to 6.1 ns on the TiO<sub>2</sub> grating. Back focal plane (BFP) spectroscopy confirmed how the Bloch resonances transformed the unpolarized, spatially incoherent emission of NCs into polarized and directed light. These findings provide further insights into the interactions between dielectric nanostructures and perovskite NC films, offering possible pathways for designing better performing perovskite optoelectronic devices.
Authors
- Bui Xuan Khuyen (ORCID: https://orcid.org/0000-0001-6106-3089)
- Bùi Sơn Tùng (ORCID: https://orcid.org/0000-0003-3267-001X)
- Thi Thu Ha (ORCID: https://orcid.org/0009-0000-3700-0483)
- Quynh Le‐Van (ORCID: https://orcid.org/0000-0002-9623-7437)
- Andrey L. Rogach (ORCID: https://orcid.org/0000-0002-8263-8141)
- Vytautas Valuckas
- Linh Thi Dieu Nguyen (ORCID: https://orcid.org/0009-0000-1636-2020)
- Hai Son Nguyen (ORCID: https://orcid.org/0000-0002-1638-2272)
- Ye Wu (ORCID: https://orcid.org/0000-0002-7007-2160)
- Viet Anh Nguyen (ORCID: https://orcid.org/0009-0003-8706-2289)
- Son Tung Ha (ORCID: https://orcid.org/0000-0002-5475-8365)
- Aleksandr A. Sergeev (ORCID: https://orcid.org/0000-0002-8294-865X)
- Ding Zhu
- Thanh Binh Nguyen (ORCID: https://orcid.org/0000-0002-5166-7919)
- Duong Thanh Pham
- Vũ Đình Lãm (ORCID: https://orcid.org/0000-0002-8067-1503)
- Hai Xuan Son Bui
- Duy Mai Hoang
Institutions
- Université Claude Bernard Lyon 1 (FR)
- École Centrale de Lyon (FR)
- Agency for Science, Technology and Research (SG)
- Centre National de la Recherche Scientifique (FR)
- City University of Hong Kong (HK)
- Institut Universitaire de France (FR)
- Hong Kong University of Science and Technology (HK)
- Institut des Nanotechnologies de Lyon (FR)
- Institute of Materials Research and Engineering (SG)
- VinUniversity (VN)
- Institut National des Sciences Appliquées de Lyon (FR)
- École d'Ingénieurs en Chimie et Sciences du Numérique (FR)
- Vietnam Academy of Science and Technology (VN)
- University of Hong Kong (HK)
- Hanoi University of Science and Technology (VN)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2024-11-04
- DOI
- https://doi.org/10.1021/acs.jpclett.4c02546
- Citations
- 3
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.63
Funders
- Tập đoàn Vingroup - Công ty CP
- Agency for Science, Technology and Research
- Croucher Foundation
- Harbin Engineering University
- Région Auvergne-Rhône-Alpes
- Quỹ Đổi mới sáng tạo Vingroup