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Citation
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HERO ID
6322292
Reference Type
Journal Article
Title
Exploring Orbit-Orbit Interaction in Relationship to Photoluminescence Quantum Efficiency in Perovskite Quantum Dots through Rashba Effect
Author(s)
Xu, H; Prabhakaran, P; Choi, S; Wang, M; Lee, KS; Hu, B
Year
2020
Is Peer Reviewed?
1
Journal
Journal of Physical Chemistry Letters
ISSN:
1948-7185
Volume
11
Issue
1
Page Numbers
1-6
Language
English
PMID
31794224
DOI
10.1021/acs.jpclett.9b02936
Web of Science Id
WOS:000506088000001
Abstract
This study demonstrates the influence of the orbit-orbit interaction on the photoluminescence quantum efficiency (PLQE) of metal halide perovskite quantum dots (QDs) through the Rashba effect. The orbit-orbit interaction between excitons was characterized by using the minimal excitation intensity required to generate a photoluminescence difference (ΔPL) between linearly and circularly polarized photoexcitations. It was observed that changing the surface functionalization from PFOA-OA to PFSH-OAm and OA can largely increase the minimal excitation intensity for generating ΔPL. This indicates that the orbit-orbit interaction is essentially decreased in CsPbBr1I2 QDs with surface functionalization. Simultaneously, the PLQE is increased from 39% to 59 and 72% in CsPbBr1I2 QDs upon surface functionalization. Furthermore, the PL lifetime is decreased with increasing the PLQE in CsPbBr1I2 QDs upon surface functionalization. This phenomenon implies that decreasing the orbit-orbit interaction can essentially weaken the Rashba effect and consequently reduce the disallowed transitions, leading to an enhancement in the PLQE in perovskite QDs.
Tags
PFAS
•
Additional PFAS (formerly XAgency)
•
PFOA (335-67-1) and PFOS (1763-23-1)
LitSearch: Feb 2019 - May 2020
WoS
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