Micrometer-Resolution Fluorescence and Lifetime Mappings of CsPbBr3 Nanocrystal Films Coupled with a TiO2 Grating
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 11291-11299 |
Journal / Publication | The Journal of Physical Chemistry Letters |
Volume | 15 |
Issue number | 45 |
Online published | 4 Nov 2024 |
Publication status | Published - 14 Nov 2024 |
Link(s)
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.
In: The Journal of Physical Chemistry Letters, Vol. 15, No. 45, 14.11.2024, p. 11291-11299.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review