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Title: Weakly confined organic–inorganic halide perovskite quantum dots as high-purity room-temperature single photon sources
Authors: Wang, Bo
Lim, Melvin Jia Wei
Loh, Siow Mean
Mayengbam, Rishikanta
Ye, Senyun
Feng, Minjun
He, Huajun
Liang, Xiao
Cai, Rui
Zhang, Qiannan
Kwek, Leong Chuan
Demir, Hilmi Volkan
Mhaisalkar, Subodh Gautam
Blundell, Steven A.
Sum, Tze Chien
Keywords: Physics
Issue Date: 2024
Source: Wang, B., Lim, M. J. W., Loh, S. M., Mayengbam, R., Ye, S., Feng, M., He, H., Liang, X., Cai, R., Zhang, Q., Kwek, L. C., Demir, H. V., Mhaisalkar, S. G., Blundell, S. A. & Sum, T. C. (2024). Weakly confined organic–inorganic halide perovskite quantum dots as high-purity room-temperature single photon sources. ACS Nano, 18(16), 10807-10817.
Project: NGF-2022-11-018 
Journal: ACS Nano 
Abstract: Colloidal perovskite quantum dots (PQDs) emerge as highly promising single photon emitters for quantum information applications. Presently, most strategies have focused on leveraging quantum confinement to increase the nonradiative Auger recombination (AR) rate to enhance SP purity in all-inorganic CsPbBr3 QDs. However, this also increases fluorescence intermittency. Achieving high SP purity and blinking mitigation simultaneously remains a significant challenge. Here, we transcend this limitation with room-temperature synthesized weakly-confined hybrid organic–inorganic perovskite (HOIP) QDs. Superior single photon purity with low g^((2) ) (0)<0.07±0.03 and nearly blinking-free behaviour (ON-state fraction >95%) in 11 nm FAPbBr3 QDs is achieved at room temperature; attributed to their long exciton lifetimes (τ_X) and short biexciton lifetimes (τ_XX). The significance of the organic A-cation is further validated using mixed-cation FAxCs1-xPbBr3. Theoretical calculations utilizing a combination of the Bethe-Salpeter (BSE) and k⋅p approaches point towards the modulation of the dielectric constants by the organic cations. Importantly, our findings provide valuable insights into an additional lever for engineering facile-synthesized room-temperature PQD single photon sources.
ISSN: 1936-0851
DOI: 10.1021/acsnano.3c12311
DOI (Related Dataset): 10.21979/N9/ZOTDKX
Schools: School of Physical and Mathematical Sciences 
School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
The Photonics Institute 
Rights: © 2024 American Chemical Society. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at
Fulltext Permission: embargo_20250424
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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