Light‐Controlled On‐Off Switch of a Fluorescent Nanoparticle

This minireview highlights recent advances of research dedicated to photoswitchable fluorescent nanoparticles and their applications. Recently, several strategies have been developed to synthesize nanoparticles with optically switchable emission properties: either fluorescence on/off or dual-alternating-color fluorescence photoswitching. The underlying mechanisms of fluorescence photoswitching enable many different types of photoswitchable fluorescent nanoparticles to change fluorescence colors, thus validating the basis of the initial photoswitching design. Among all possible applications, the usage of photoswitchable fluorescent nanoparticles to empower super-resolution fluorescence imaging and to label biological targets was subsequently reviewed. Finally, we summarize the important areas regarding future research and development on photoswitchable fluorescent nanoparticles.

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“…[99,100] Using similar methods, Liu's group and others also prepared photoswitchable fluorescent nanoparticles. [102][103][104][105][106]…”

Section: The Microemulsion Polymerization Strategymentioning

confidence: 99%

Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications

Zhang

2009

ChemPhysChem

124

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“…[94][95][96][97] When only one of the two states of these photochromic compounds is fluorescent, their photoinduced transformations result in the effective modulation of the emission intensity of the overall assembly. Alternatively, independent fluorescent and photochromic components can be trapped within the hydrophobic interior [98][99][100] or covalently linked to the macromolecular backbone [101,102] of cross-linked polymer nanoparticles. For example, the nanostructured construct 18a (Figure 15) can be assembled by co-polymerizing perylene diimide fluorophores and spiropyran photochromes together with N-isopracrylamide, divinylbenzene and styrene in aqueous environment.…”

Section: Nanoparticlesmentioning

confidence: 99%

Fluorescent Switches Based on Photochromic Compounds

2009

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The photochemical transformations associated with photochromic compounds can be exploited to switch the emission of complementary fluorophores under the influence of optical stimulations. Specifically, fluorescent and photochromic components can be integrated within the same molecular or supramolecular assembly and the significant changes in the stereoelectronic properties associated with the photoinduced interconversion of one component can be designed to modulate the emission intensity and/or wavelength of the other. In particular, the modifications in absorption properties, conjugation, dipole moment, redox potentials and shape of a photochrome can all be transduced effectively into reversible alterations of the emissive behavior of a fluorophore. Furthermore, some of these ingenious mechanisms for fluorescence 1. Photochromism History and DefinitionsThe term "photochromism" was introduced in the early 1950s to indicate the photoinduced and reversible change in color of certain compounds.[1] Since then, the number of publications on photochromism has increased exponentially [a]

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“…30 (λ abs max =518 nm) and fluorescent dye Sch. 31 (λ max =503 nm) prepared by miniemulsion polymerization exhibit lightcontrolled on-off fluorescence switching even when embedded in hydrogels [58].…”

Section: Scheme 25mentioning

confidence: 99%

Nanophotochromism

Barachevsky¹

2015

Organic Photonics and Photovoltaics

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Abstract:The review presents the state-of-the-art analysis of investigations in the field of a new line of research of photochromism -nanophotochromism. The design, properties, and possible applications of photochromic nanoparticles prepared by different methods with the use of photochromic substances (aggregates, host-guest, and polymer systems, solid nanoparticles) as well as core-shell photochromic nanostructures based on polymers, silica, quantum dots, doped upconversion nanocrystals, and Ag, Au, etc. nanoparticles have been reviewed. Keywords: photochromism; photochromic nanoparticles; core-shell photochromic nanoparticles design; photoswitching; aggregates; polymer systems, host-guest systems IntroductionPhotochromism is a very important phenomenon for different applications in photonics. The applications are based on reversible phototransformations of photochromic compounds between two states and changes of their properties that accompany these transformations At present, systems and materials containing photochromic nanopatricles have become highly significant. Among these are nanodimensional particles of photochromic substances, including aggregates, and coreshell systems. As a core, inorganic nanoparticles of gold, silver, metal oxides, quantum dots (QD), and also polymeric nanoparticles are used. The shell consists of photochromic molecules or their aggregates connected to a core surface either chemically or physically. Photochromic nanoparticles with photocontrolled fluorescence arouse a special interest because the fluorescence technique is becoming a leading strategy in biological diagnosis, imaging, and detection applications. This paper is a state-of-the-art review which presents results of studying photochromic nanoparticles including author's own data. The results of earlier research are also surveyed in some other reviews [1][2][3][4][5][6][7][8][9][10][11][12][13]. Photochromic nanoparticles:properties and applications Nanoparticles based on photochromic substances AggregatesThe most known photochromic nanoparticles are aggregates of photochromic organic compounds [14]. These compounds experience reversible photoinduced transformations between two states, Sch. 1A and Sch. 1B. Scheme 1The photoinduced colored merocyanine form B absorbing visible irradiation is formed from a colorless form A as a result of photodissociation of the -C-O-bond of the pyran heterocycle under UV radiation, and this is followed by spontaneous isomerization of the cis-form to the trans one. The colored form B can be converted back to the initial colorless form A upon absorption of visible light or spontaneously during the dark relaxation, which is accelerated by heating.The J-aggregates of nitro-substituted indoline spiropyrans Sch. 2 with long alkyl substituents are of special interest [15].The narrow absorption bands of J-aggregates of these photochromic compounds (Fig. 1) made it possible prepare a specimen of the multilayered optical disk providing freUnauthenticated Download

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Light‐Controlled On‐Off Switch of a Fluorescent Nanoparticle

Cited by 27 publications

References 20 publications

Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications

Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications

Fluorescent Switches Based on Photochromic Compounds

Nanophotochromism

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