Switchable near-infrared photoluminescence of PbS quantum dots through light and heat modulated hole transfer to spiropyran molecules

IF 9 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Zongwei Chen, Zhengxiao Li, Fan Li, Jingzhu Huo, Xinyi Meng, Shihao Ma, Wenbo Zhu, Fengqi Guo, Jia-Hua Hu, Kaifeng Wu
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引用次数: 0

Abstract

Precise modulation of photoluminescence (PL) of nanomaterials by external control is of great interest in such diverse areas as photocatalysis, memory and sensing. Recent studies have combined colloidal quantum dots (QDs) with photochromic molecules to construct optically switchable PL systems. However, it still remains challenging to switch the PL on and off in the near-infrared (NIR) region with multi-stimuli such as light and heat. Here, we present light and heat triggered modulation of the NIR PL of PbS QDs using adjacent spiropyran derivatives. The NIR PL of PbS was reversibly switched on and off through the isomerization process of spiropyran molecules that can be triggered by either light irradiation or heating. The PL intensity of the off state is low enough to yield an on/off ratio as high as 54. Transient absorption measurements revealed ultrafast photoinduced hole transfer from PbS to spiropyran, the rate and efficiency of which depend critically on the driving force that can be deeply modulated through spiropyran isomerization. This study not only establishes a novel multi-stimuli switchable PL system in the NIR, but also provides fundamental guidelines for the design for such systems for a variety of emerging applications.

通过光和热调制空穴转移到螺吡喃分子的PbS量子点的可切换近红外光致发光
通过外部控制对纳米材料的光致发光(PL)进行精确调制,在光催化、记忆和传感等多个领域引起了人们的极大兴趣。最近的研究将胶体量子点(QDs)与光致变色分子相结合,构建了光可切换的量子点系统。然而,在光和热等多种刺激下,在近红外(NIR)区域打开和关闭PL仍然是一个挑战。在这里,我们提出了光和热触发调制的近红外PL的PbS量子点使用邻近的螺吡喃衍生物。通过螺吡喃分子的异构化过程,可通过光照射或加热触发PbS的近红外PL可逆地打开和关闭。关闭状态的PL强度足够低,可以产生高达54的开/关比。瞬态吸收测量揭示了从PbS到螺吡喃的超快光诱导空穴转移,其速率和效率关键取决于可以通过螺吡喃异构化深度调制的驱动力。本研究不仅在近红外中建立了一种新颖的多刺激可切换PL系统,而且为各种新兴应用的此类系统的设计提供了基本指导。
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来源期刊
Nano Research
Nano Research 化学-材料科学:综合
CiteScore
14.30
自引率
11.10%
发文量
2574
审稿时长
1.7 months
期刊介绍: Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.
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