Impact of photo-irradiation on the optical and spin properties of chiral CdS quantum dot films

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-14 DOI:10.1063/5.0268396

Pan Liang, Yang Wang, Lin Cheng, Rongrong Hu, Yumeng Men, Jinlei Li, Tianqing Jia, Zhenrong Sun, Donghai Feng

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引用次数: 0

Abstract

Chiral quantum dots (QDs) are expected to play a significant role in chiral molecular recognition, spin-selective filtering for charge transport, and various other fields. Photo-irradiation can enhance the photoluminescence (PL) of chiral CdSe QD films, which serves as a convenient method to modulate the optical properties. However, the effects of photo-irradiation on the absorption and spin properties of chiral QDs remain unclear. In this study, we investigate the influence of photo-irradiation on the PL, absorption, and spin properties of chiral L/D-cysteine-capped CdS QD films. Under the irradiation of the 458 nm continuous wave laser, the PL intensity of chiral CdS QD films can be significantly enhanced by over 50 times and the absorption peak exhibits a blue shift of approximately 3 nm. The transient transmission dynamics before and after irradiation indicate that the bleach recovery lifetime became longer after irradiation, which can be attributed to the increase in radiative recombination. Furthermore, the strength of the electron spin is diminished due to a decrease in the number of charge-separated electrons. The significant enhancement in PL intensity, coupled with the increased radiative recombination and the reduction in spin signals, strongly suggests that surface defects are effectively passivated. The influence of photo-irradiation on the optical properties of chiral QDs provides valuable insights for the design of chiral nanomaterials and their applications.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.