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Title: Defect passivation using a phosphonic acid surface modifier for efficient RP perovskite blue-light-emitting diodes
Authors: Mishra, Jayanta Kumar
Yantara, Natalia
Kanwat, Anil
Furuhashi, Tomoki
Ramesh, Sankaran
Salim, Teddy
Nur Fadilah Jamaludin
Febriansyah, Benny
Ooi, Zi En
Mhaisalkar, Subodh
Sum,Tze Chien
Hippalgaonkar, Kedar
Mathews, Nripan
Keywords: Engineering::Materials::Composite materials
Issue Date: 2022
Source: Mishra, J. K., Yantara, N., Kanwat, A., Furuhashi, T., Ramesh, S., Salim, T., Nur Fadilah Jamaludin, Febriansyah, B., Ooi, Z. E., Mhaisalkar, S., Sum, T. C., Hippalgaonkar, K. & Mathews, N. (2022). Defect passivation using a phosphonic acid surface modifier for efficient RP perovskite blue-light-emitting diodes. ACS Applied Materials & Interfaces, 14(30), 34238-34246.
Project: NRFCRP14-2014-03 
Journal: ACS Applied Materials & Interfaces 
Abstract: Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, a thorough study on the roles of additives is essential, especially for blue emissive Pe-LEDs, where the emission is strictly controlled by the n-domain distribution of the Ruddlesden–Popper (RP, L2An–1PbnX3n+1, where L refers to a bulky cation, while A and X are monovalent cation, and halide anion, respectively) perovskite films. Of the various additives that are available, octyl phosphonic acid (OPA) is of immense interest because of its ability to bind with uncoordinated Pb2+ ( notorious for nonradiative recombination) and therefore passivates them. Here, with the help of various spectroscopic techniques, such as X-ray photon-spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence quantum yield (PLQY) measurements, we demonstrate the capability of OPA to bind and passivate unpaired Pb2+ defect sites. Modification to crystallization promoting higher n-domain formation is also observed from steady-state and transient absorption (TA) measurements. With OPA treatment, both the PLQY and EQE of the corresponding PeLED showed improvements up to 53% and 3.7% at peak emission wavelength of 485 nm, respectively.
ISSN: 1944-8244
DOI: 10.1021/acsami.2c00899
DOI (Related Dataset): 10.21979/N9/UCZNYU
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Organisations: Institute of Materials Research and Engineering, A*STAR
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
IGS Journal Articles
MSE Journal Articles
SPMS Journal Articles

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