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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Viet Anh Nguyen
  • Ye Wu
  • Thi Thu Ha Do
  • Linh Thi Dieu Nguyen
  • Aleksandr A. Sergeev
  • Vytautas Valuckas
  • Duong Pham
  • Hai Xuan Son Bui
  • Duy Mai Hoang
  • Bui Son Tung
  • Bui Xuan Khuyen
  • Thanh Binh Nguyen
  • Hai Son Nguyen
  • Vu Dinh Lam
  • Son Tung Ha
  • Quynh Le-Van

Detail(s)

Original languageEnglish
Pages (from-to)11291-11299
Journal / PublicationThe Journal of Physical Chemistry Letters
Volume15
Issue number45
Online published4 Nov 2024
Publication statusPublished - 14 Nov 2024

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. © 2024 American Chemical Society.

Citation Format(s)

Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating. / Nguyen, Viet Anh; Wu, Ye; Ha Do, Thi Thu et al.
In: The Journal of Physical Chemistry Letters, Vol. 15, No. 45, 14.11.2024, p. 11291-11299.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review