Abstract
Dynamic materials have been given an increased amount of attention in recent years with an expectation that they may exhibit properties on demand. Especially, the combination of fluorescent quantum dots (QDs) and light-responsive organic switches can generate novel photo-switchable materials for diverse applications. In this work, a highly reversible dynamic hybrid system is established by mixing dual-color emitting Mn-doped CdS-ZnS quantum dots (QDs) with photo-switchable diarylethene molecules. We show that the diarylethene 1,2-bis(5-(3,5-bis(trifluoromethyl)phenyl)-2-methylthiophen-3-yl)cyclopent-1-ene (switch molecule 1) performs fabulous photo-switching property (between its open, 1o and closed, 1c forms), and high fatigue resistance in this hybrid system. The emission color switching between blue and pink of the system can be induced mainly by selective quenching/recovering of the Mn- photoluminescence (PL) of the QDs due to the switchable absorbance of the molecule 1. Mechanistic studies show that quenching of QD emission following UV illumination was caused by both Förster resonance energy transfer (FRET) and reabsorption by surrounding 1c molecules in the case of the Mn-PL, and solely by reabsorption in the case of badngap- (BG-)PL. This photo-switchable system could be potentially used in applications ranging from self-erasing paper to super-resolution fluorescence imaging.
Highlights
Dynamic materials have attracted attention of chemists in the past two decades owing to their potentials to be used for generating responsive materials for various applications (Kay et al, 2007; Grinthal and Aizenberg, 2013; Klajn, 2014)
A variety of photo-switchable molecules such as azobenzenes (Bandara and Burdette, 2012), spiropyrans (Minkin, 2004), dithienylethenes (Irie, 2000; Irie et al, 2014), stilbene (Momotake and Arai, 2004) etc. have been employed to functionalize different nanomaterials (Yildiz et al, 2009; Klajn et al, 2010; Wang and Li, 2018) to construct light-responsive systems spanning from metal nanocrystals (Kundu et al, 2015; Manna et al, 2015; Zhao et al, 2015), metal oxide nanocrystals (Mikami et al, 2004; Min Yeo et al, 2008), to quantum dots (QDs) (Zhu et al, 2005, 2006; Díaz et al, 2011, 2015) and metal-organic frameworks (MOFs) (Dolgopolova et al, 2018)
Taking advantages of the dynamic switchable absorbance of diarylethene molecules and the dual-color emission property of Mn-doped CdS-ZnS QDs, in this work, we demonstrate a photoswitchable hybrid system by selectively quenching/recovering the Mn dopant emission
Summary
Dynamic materials have attracted attention of chemists in the past two decades owing to their potentials to be used for generating responsive materials for various applications (Kay et al, 2007; Grinthal and Aizenberg, 2013; Klajn, 2014). Combining organic molecular switches with inorganic nanocrystals can afford dynamic hybrid systems with switchable properties (Klajn et al, 2010; Qu et al, 2015; Bai et al, 2016; Li et al, 2017). Have been employed to functionalize different nanomaterials (Yildiz et al, 2009; Klajn et al, 2010; Wang and Li, 2018) to construct light-responsive systems spanning from metal nanocrystals (Kundu et al, 2015; Manna et al, 2015; Zhao et al, 2015), metal oxide nanocrystals (Mikami et al, 2004; Min Yeo et al, 2008), to quantum dots (QDs) (Zhu et al, 2005, 2006; Díaz et al, 2011, 2015) and metal-organic frameworks (MOFs) (Dolgopolova et al, 2018) A variety of photo-switchable molecules such as azobenzenes (Bandara and Burdette, 2012), spiropyrans (Minkin, 2004), dithienylethenes (Irie, 2000; Irie et al, 2014), stilbene (Momotake and Arai, 2004) etc. have been employed to functionalize different nanomaterials (Yildiz et al, 2009; Klajn et al, 2010; Wang and Li, 2018) to construct light-responsive systems spanning from metal nanocrystals (Kundu et al, 2015; Manna et al, 2015; Zhao et al, 2015), metal oxide nanocrystals (Mikami et al, 2004; Min Yeo et al, 2008), to quantum dots (QDs) (Zhu et al, 2005, 2006; Díaz et al, 2011, 2015) and metal-organic frameworks (MOFs) (Dolgopolova et al, 2018)
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