Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications

Zhang, Tian; Wu, Wuwei; Li, Alexander D. Q.

doi:10.1002/cphc.200900492

Cited by 124 publications

(97 citation statements)

References 126 publications

(107 reference statements)

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“…However, our fluorescence setup is limited to probing MC-CD, not SP-CD. The presence of the electron injection decay channel (k inj ) on the titania surface will reduce the excited-state τ MC of the MC chromophore compared to that on the insulating zirconia surface: (6) This approach assumes that k R , k IC , and k isom are constant between the two metal oxide surfaces; studies have found this to be a reasonable assumption. 34,35 The time-resolved fluorescence decay curve for MC-CD-Ti after excitation at 532 nm is shown in Figure 5.…”

Section: Spiropyran−cyclodextrin Electron Injection Propertiesmentioning

confidence: 99%

Electron Injection and Energy-Transfer Properties of Spiropyran–Cyclodextrin Complexes Coated onto Metal Oxide Nanoparticles: Toward Photochromic Light Harvesting

Dryza

Bieske

2015

J. Phys. Chem. C

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The photochromic and spectroscopic properties of spiropyran−γ-cyclodextrin inclusion complexes coated onto the surface of zirconia and titania nanoparticles (NPs) are examined. After ultraviolet (UV) irradiation, the colorless spiropyran (SP) isomer contained within the cyclodextrin (CD) is converted to the colored merocyanine (MC) isomer, which absorbs light in the 400−600 nm region. A significant increase in the excited-state lifetime for MC-CD on zirconia NPs (τ MC = 1.32 ns) is observed compared to MC in solution (τ MC = 0.21 ns), indicating that MC → SP photoisomerisation is hindered by the surrounding CD. Excitation of MC-CD on titania NPs results in electron injection into the titania conduction band with a quantum yield of 0.70. Excitation of MC-CD on zirconia NPs when a squaraine-based dye sensitizer is also attached to the NP surface results in energy transfer to the dye sensitizer with a quantum yield of 0.65. The prolonged excited-state lifetime of the encapsulated MC-CD is responsible for the high electron injection and energy-transfer quantum yields. The SP-CD/MC-CD system has potential applications for photochromic, light-harvesting electrodes in dye-sensitized solar cells.

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Section: Spiropyran−cyclodextrin Electron Injection Propertiesmentioning

confidence: 99%

Electron Injection and Energy-Transfer Properties of Spiropyran–Cyclodextrin Complexes Coated onto Metal Oxide Nanoparticles: Toward Photochromic Light Harvesting

Dryza

Bieske

2015

J. Phys. Chem. C

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“…At long wavelength edge (case c ) the species absorbing and emitting the low energy quanta are excited only. They do not exhibit FRET and their emission is highly polarized fl uorescent light intensities can oscillate between the FRET donor and acceptor emissions providing ON-OFF switching at each act of photoinduced transformations by light (Tian et al 2009 ;Giordano et al 2002 ;Jares-Erijman and Jovin 2003 ). Among different photochromes, diheteroarylethenes (Fig.…”

Section: Modulation By Lightmentioning

confidence: 99%

Fluorescent Nanocomposites

Demchenko¹

2015

Introduction to Fluorescence Sensing

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In previous Chapters we discussed different properties of fl uorescence emitters in order to understand them and optimize them adapting for different sensing and imaging technologies. New unlimited possibilities are offered by composing the nanocomposites formed of different types of emitters. They display a variety of novel useful features and thus extend dramatically the information content of output data. Researcher can design them from different types of luminophores of molecular and nanoscale origin (Fig. 6.1 ), manipulating with their connection, interaction, formation of new surfaces and interfaces. Their fl uorescence response can be modulated by electronic conjugation or by excited-state resonance energy transfer and coupled with other functionalities on nanoscale level.The luminescent molecules and nanoparticles can serve as building blocks for achieving versatile functions that are not observed in separate emitters alone. These larger nanocomposites demonstrate dramatically increased brightness, the ability to

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“…FRET-based NPs have been exploited for wavelength conversion, expansion of fluorescence lifetime, amplification of emission, and fluorescence photoswitching. Using FRET methods, NPs with improved photophysical properties have been widely used as highly sensitive bioprobes [77][78][79].…”

Section: Energy Transfermentioning

confidence: 99%

Nanoparticles of Conjugated Molecules and Polymers for Biomedical Applications

Seo

Lee

Cho

et al. 2015

Advances in Polymer Science

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Semiconducting organic materials based on π-conjugated molecules or polymers have recently received considerable attention for their use as imaging and therapeutic agents for biomedical applications. Because π-conjugated materials exhibit desirable characteristics such as high brightness, photostability, emission tunability, and low toxicity, they are an attractive alternative to conventional fluorophores. In this review, the recent development of π-conjugated molecular nanoparticles for in vitro and in vivo biomedical applications is discussed.

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Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications

Cited by 124 publications

References 126 publications

Electron Injection and Energy-Transfer Properties of Spiropyran–Cyclodextrin Complexes Coated onto Metal Oxide Nanoparticles: Toward Photochromic Light Harvesting

Electron Injection and Energy-Transfer Properties of Spiropyran–Cyclodextrin Complexes Coated onto Metal Oxide Nanoparticles: Toward Photochromic Light Harvesting

Fluorescent Nanocomposites

Nanoparticles of Conjugated Molecules and Polymers for Biomedical Applications

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