Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating

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Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating
Title:
Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating
Journal Title:
The Journal of Physical Chemistry Letters
Publication Date:
04 November 2024
Citation:
Nguyen, V. A., Wu, Y., Ha Do, T. T., Dieu Nguyen, L. T., Sergeev, A. A., Zhu, D., Valuckas, V., Pham, D., Son Bui, H. X., Hoang, D. M., Tung, B. S., Khuyen, B. X., Nguyen, T. B., Nguyen, H. S., Lam, V. D., Rogach, A. L., Ha, S. T., & Le-Van, Q. (2024). Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating. The Journal of Physical Chemistry Letters, 11291–11299. https://doi.org/10.1021/acs.jpclett.4c02546
Abstract:
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 TiO2 grating to enhance light extraction and shape the emission of CsPbBr3 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 TiO2 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.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Manufacturing, Trade, and Connectivity Programmatic Fund - Nanoantenna light emitting devices
Grant Reference no. : M21J9b0085
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.jpclett.4c02546.
ISSN:
1948-7185
1948-7185
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