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

Autor: Rivera Medina MJ; Photophysics & Optoelectronics group, Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands. M.A.Loi@rug.nl.; Departamento de Materia Condensada y Criogenia. Instituto de Investigaciones en Materiales. Universidad Nacional Autónoma de México. Ciudad Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico City, Mexico., Di Mario L; Photophysics & Optoelectronics group, Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands. M.A.Loi@rug.nl., Kahmann S; Photophysics & Optoelectronics group, Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands. M.A.Loi@rug.nl., Xi J; Photophysics & Optoelectronics group, Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands. M.A.Loi@rug.nl., Portale G; Macromolecular Chemistry and New Polymeric Material, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands., Bongiovanni G; Dipartimento di Fisica, Università degli Studi di Cagliari, cittadella universitaria 09040, Monserrato, Cagliari, Italy., Mura A; Dipartimento di Fisica, Università degli Studi di Cagliari, cittadella universitaria 09040, Monserrato, Cagliari, Italy., Alonso Huitrón JC; Departamento de Materia Condensada y Criogenia. Instituto de Investigaciones en Materiales. Universidad Nacional Autónoma de México. Ciudad Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico City, Mexico., Loi MA; Photophysics & Optoelectronics group, Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands. M.A.Loi@rug.nl.
Jazyk: angličtina
Zdroj: Nanoscale [Nanoscale] 2023 Apr 06; Vol. 15 (14), pp. 6673-6685. Date of Electronic Publication: 2023 Apr 06.
DOI: 10.1039/d3nr00087g
Abstrakt: 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 PEA 2 (Cs 0.75 MA 0.25 )Pb 2 Br 7 , 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.
Databáze: MEDLINE
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