Issue 14, 2023

Tuning the energy transfer in Ruddlesden–Popper perovskites phases through isopropylammonium addition – towards efficient blue emitters

Abstract

Here we demonstrate blue LEDs with a peak wavelength of 481 nm, with outstanding colour purity of up to 88% (CIE coordinates (0.1092, 0.1738)), an external quantum yield of 5.2% and a luminance of 8260 cd m−2. These devices are based on quasi-2D PEA2(Cs0.75MA0.25)Pb2Br7, which is cast from solutions containing isopropylammonium (iPAm). iPAm as additive assist in supressing the formation of bulk-like phases, as pointed out by both photophysical and structural characterization. Additionally, the study of the excitation dynamics demonstrates a hindering of the energy transfer to domains of lower energy that generally undermines the performance and emission characteristics of blue-emitting LEDs based on quasi-2D perovskites. The achieved narrow distribution of quantum well sizes and the hindered energy transfer result in a thin film photoluminescence quantum yield exceeding 60%. Our work demonstrates the great potential to tailor the composition and the structure of thin films based on Ruddlesden–Popper phases to boost performance of optoelectronic devices – specifically blue perovskite LEDs.

Graphical abstract: Tuning the energy transfer in Ruddlesden–Popper perovskites phases through isopropylammonium addition – towards efficient blue emitters

Supplementary files

Article information

Article type
Paper
Submitted
06 1 2023
Accepted
12 3 2023
First published
13 3 2023
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2023,15, 6673-6685

Tuning the energy transfer in Ruddlesden–Popper perovskites phases through isopropylammonium addition – towards efficient blue emitters

M. J. Rivera Medina, L. Di Mario, S. Kahmann, J. Xi, G. Portale, G. Bongiovanni, A. Mura, J. C. Alonso Huitrón and M. A. Loi, Nanoscale, 2023, 15, 6673 DOI: 10.1039/D3NR00087G

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